Acronyms

0-9

2D-MAX-DOAS

two-dimensional multi-axis differential optical absorption spectroscopy

2D-S

(stereo) optical array spectrometer

2DC

two-dimensional cloud

2DVD

two-dimensional video disdrometer

3DVAR

three-dimensional variational data assimilation

4DDA

four-dimensional data assimilation

4STAR

Spectrometer for Sky-scanning Sun-Tracking Atmospheric Research (NASA)

A

A-ATOFMS

Aircraft-aerosol time-of-flight mass spectrometer

AA

absorbing aerosols

AAAAI

American Academy of Allergy Asthma and Immunology

AABW

Antarctic bottom water

AACP

above-anvil cirrus plume

AACT

ARM-ASR Coordination Team

AAD

Australian Antarctic Division

AAE

Absorption Angstrom Exponent

AAF

ARM Aerial Facility

AALCO

Aerial Assessment of Liquid in Clouds at Oliktok

AAO

Adjacent Arctic Ocean

AAOD

aerosol absorption optical depth

AASE

Airborne Arctic Stratospheric Expedition

AATS

Ames airborne tracking sunphotometer

AATSR

Advanced Along-Track Scanning Radiometer

ABC

absorbing boundary condition or atmospheric brown cloud

ABE

Aerosol Best Estimate

ABI

Advanced Baseline Imager (GOES-R satellite)

ABIFM

activity-based immersion freezing model

ABL

atmospheric boundary layer

ABLE

Argonne Boundary Layer Experiment or Arctic Boundary Layer Experiment or Amazon Boundary Layer Experiment (NASA)

ABoVE

Arctic-Boreal Vulnerability Experiment

ABRACOS

Anglo-Brazilian Amazonian Climate Observation Study

ABRFC

Arkansas Basin Red River Forecast Center

ACAOD

above-cloud aerosol optical depth

ACAPEX

ARM Cloud Aerosol Precipitation Experiment

ACARS

Aerodynamic (Research Incorporated) Communication and Recording System or Aircraft Communication Addressing and Reporting System

ACAS

Arctic Climate Across Scales

ACC

Antarctic Circumpolar Current

ACCACIA

Aerosol Cloud Coupling and Climate Interaction in the Arctic

ACCEPT

Analysis of the Composition of Clouds with Extended Polarization Techniques

ACCESS

Australian Community Climate and Earth System Simulator or aerosol counting, composition, extinction, and sizing system

ACCESS-AM2

Australian Community Climate and Earth System Simulator Atmosphere-only Model version 2

ACCMIP

Atmospheric Chemistry and Climate Model Intercomparison Project

ACCP

Aerosol, Cloud, Convection, and Precipitation study (NASA)

ACDC

Atmospheric Cluster Dynamic Code

ACE

Aerosol Characterization Experiment or Antarctic Circumnavigation Expedition or Accumulated Cyclone Energy

ACE-2

Second Aerosol Characterization Experiment

ACE-Asia

Asian Pacific Regional Aerosol Characterization Experiment

ACE-ENA

Aerosol and Cloud Experiments in the Eastern North Atlantic

ACE-SPACE

Antarctic Circumnavigation Expedition - Study of Preindustrial-like Aerosol Climate Effects

ACI

aerosol-cloud interactions

ACIA

Arctic Climate Impact Assessment

ACME

Accelerated Climate Model for Energy or Airborne Carbon Measurements campaign

ACOM

Atmospheric Chemistry Observations and Modeling (NCAR)

ACORES

Azores Statocumulus Measurements of Radiation, Turbulence and Aerosols

ACOS

Atmospheric Carbon Observation from Space

ACP

absolute cavity pyrgeometer

ACR

airborne cloud radar

ACRE

Antarctic Clouds and Radiation Experiment

ACRF

ARM Climate Research Facility

ACRIDICON-CHUVA

Aerosol, Cloud, Precipitation, and Radiation Interactions and Dynamics of Convective Cloud Systems

ACROS

airborne cloud-radiation observing system

ACSE

Arctic Clouds in Summer Experiment

ACSM

Aerosol Chemical Speciation Monitor

ACSYS

Arctic Climate System Study

ACT

ARM Coordination Team

ACTIVATE

Aerosol Cloud Meteorology Interactions Over the Western Atlantic Experiment

ACTIVE

aerosol and chemical transport in tropical convection

ACTOS

Airborne Cloud Turbulence Observation System

ACTRIS

Aerosols, Clouds and Trace Gases Research Infrastructure

ACUASI

Alaska Center for UAS Integration

ADA

anomalous diffraction approximation

ADAS

ARPS data analysis system or Atmospheric Data Assimilation System

ADC

analog-to-digital converter

ADDA

Amsterdam discrete dipole approximation

ADDEM

aerosol diameter-dependent equilibrium model

ADEOS

advanced earth observing system (Japan Space Program)

ADF

adiabatic fraction

ADI

ARM Data Integrator

ADM

angular dependence model

ADMB

Air-deployed microbuoys

ADMIRARI

Advanced Microwave Radiometer for Rain Identification

ADT

anomalous diffraction theory

AE

Angstrom exponent

AEB

Agencia Espacial Brasileira

AEBR

aerosol extinction-to-backscatter ratios

AEC

ARM Experiment Center

AED

atmospheric evaporative demand

AEM

Automatic Exchange Mechanism

AER

Atmospheric Environmental Research, Inc.

AERI

atmospheric emitted radiance interferometer

AERI-ER

extended-range AERI

AERI-X

high-resolution (0.1 cm^-1) version of AERI

AERIoe

Atmospheric Emitted Radiance Interferometer Optimal Estimation

AEROCLO-sA

Aerosol Radiation and Clouds in southern Africa

AeroCom

Aerosol Comparisons between Observations and Models

AEROICESTUDY

Aerosol-Ice Formation Closure Pilot Study

AEROMMA

Atmospheric Emissions and Reactions Observed from Megacities to Marine Areas

AERONET

Aerosol Robotic Network

AEROSE

Aerosol and Ocean Science Expedition

AES

airborne emission spectrometer or Atmospheric Environment Services (Canada)

AETH

Aethalometer

AF

adiabatic fraction

AFC

ARM field campaign

AFGL

Air Force Geophysics Laboratory

AFM/IR

atomic force microscope-infrared

AFOSR

Air Force Office of Scientific Research

AFRC

Armstrong Flight Research Center

AFRL

Air Force Research Laboratory

AFWA

Air Force Weather Agency

AFWEX

ARM-FIRE Water Vapor Experiment

AGAGE

Advanced Global Gases Experiment

AGARD

Advisory Group for Aerospace Research and Development

AGASP

Arctic Gas and Aerosol Sampling Program

AGC

Automatic Gain Control

AGCD

Australian Gridded Climate Data

AGCMs

atmospheric general circulation models

AGGI

annual greenhouse gas index (NOAA)

AGL

above ground level

AGU

American Geophysical Union

AHI

Advanced Himawari Imager

AHM

adaptive habit model

AI

aerosol index or artificial intelligence

AIA

ARM Information Architecture

AIDA

Aerosol Interaction and Dynamics in the Atmosphere cloud chamber (Karlsruhe Institute of Technology)

AIDJEX

Arctic Ice Dynamics Joint Experiment

AIE

aerosol indirect effect

AIF

aerosol indirect forcing

AIIE

Airborne Icing Instrumentation Evaluation

AIMMS

Aircraft-integrated Meteorological Measurement System

AIMS

Australian Institute of Marine Science

AIOMFAC

Aerosol Inorganic-Organic Mixtures Functional groups Activity Coefficient

AIP

Algorithm Intrcomparison Project

AIRS

atmospheric infrared sounder or Alliance Icing Research Study

AIS

ARCS Integration Site

AIV

aerosol invigoration effect

ALABAMA

aircraft-based laser ablation mass spectrometer

ALAMO

Air-Launched Autonomous Micro Observer (ocean float program)

ALBSA

Aleutian Low-Beaufort Sea Anticyclone

ALC-IOP

Aerosol Life Cycle Intensive Observational Period (a 2011 U.S. DOE field campaign)

ALCF

Automatic Lidar and Ceilometer Framework

ALE

available lifting energy

ALEX

AIDEX Lead Experiment

ALFA

AER local forecast and assimilation (model)

ALIVE

Aerosol Lidar Validation Experiment

ALM

ACME Land Model

ALOSE

Along Line of Site Experiment

ALTOS

Arctic Lower Troposphere Observed Structure

AMAP

Arctic Monitoring and Assessment Program (Arctic Council)

AMAZE

Amazonian Aerosol Characterization Experiment

AME

aerosol microphysical effect

AMEX

Australian Monsoon Experiment

AMF

ARM Mobile Facility

AMI-WS

active microwave instrument wind scatterometer

AMIE

ARM MJO Investigation Experiment

AMIP

Atmospheric Model Intercomparison Project

AMMA

African Monsoon Multidisciplinary Analysis

AMO

Atlantic Multidecadal Oscillation

AMOC

Atlantic Meridional Overturning Circulation

AmPMS

Ambient-pressure Proton transfer Mass Spectrometer

AMPS

Antarctic Mesoscale Prediction System

AMRDC

Antarctic Meteorological Research and Data Center

AMS

aerosol mass spectrometer or accelerator mass spectrometer

AMS-SMPS

aerosol mass spectrometer-scanning mobility particle sizer

AMSL

above mean sea level

AMSR

advanced microwave scanning radiometer

AMSU-B

Advanced Microwave Sounding Unit-B

AMT

ARM Management Team or Aerosol Modeling Testbed

AMV

Atlantic Multidecadal Variability

ANL

Argonne National Laboratory

ANN

artificial neural network

AO

Arctic Oscillation

AOD

aerosol optical depth

AOFB

Autonomous ocean flux buoy

AOGCM

atmosphere-ocean global coupled model or atmosphere-ocean general circulation model

AOML

Atlantic Oceanographic and Meteorological Laboratory

AON

Arctic Observing Network

AOP

aerosol optical properties

AOPCIC

Aerosol Optical Particle Counter Intercomparison Campaign

AOS

aerosol observing system

AOT

aerosol optical thickness

AP

anisotropy parameter

APC

aerosol particle chamber

API

application programming interface

APIMS

Atmospheric Pressure Ionization Mass Spectrometry

APIP

aircraft-produced ice particle

APOLLO

AVHRR Processing Scheme Over Land, Cloud, and Ocean

APPI

atmospheric pressure photoionization

APREF

Asia-Pacific Reference Frame

APS

aerosol particle-sizing spectrometer or aerodynamic particle sizer

APSS

absorbing polystyrene spheres

AR

atmospheric river

AR Recon

Atmospheric River Reconnaissance

AR-AFS

Atmospheric River Analysis and Forecast System

ARC

Ames Research Center

ARCPAC

Aerosol, Radiation, and Cloud Processes affecting Arctic Climate

ARCS

Atmospheric Radiation and Cloud Station

ARCSS

Arctic System Science (NSF)

ARCSYM

Arctic Regional Climate System Model

ARCTAS

Arctic Research of the Composition of the Troposphere from Aircraft and Satellites

ARCUS

Arctic Research Consortium of the United States

ARDT

Atmospheric River Detection Tool

ARE

aerosol radiative effect

ARESE

ARM Enhanced Shortwave Experiment

ARF

aerosol radiative forcing

ARGN

Australian Regional GPS Network

ARH

atmospheric radiative heating

ARI

aerosol-radiation interactions

ARIES

Aryabhatta Research Institute of Observational Sciences

ARIMA

Autoregressive Integrated Moving Average

ARINC

Aerodynamic Research Incorporated Communication

ARL

Air Resources Laboratory (NOAA)

ARM

Atmospheric Radiation Measurement

ARM-ACME

ARM Airborne Carbon Measurements

ARMBE

ARM best estimate (data products)

ARMBEATM

ARM Best Estimate Atmospheric Measurements value-added product

ARMBECLDRAD

ARM Best Estimate Cloud Radiation value-added product

ARMOR

Advanced Radar for Meteorological and Operational Research

AROME

Applications of Research to Operations at Mesoscale

ARPS

Advanced Regional Prediction System

ARRA

American Recovery and Reinvestment Act (can also be shortened to "Recovery Act").

ARRC

Advanced Radar Research Center (University of Oklahoma)

ARS

Agricultural Research Service

ARSCL

Active Remotely Sensed Cloud Locations (an ARM VAP)

ARTEMIS

Advanced Responsive Tactically Effective Military Imaging Spectrometer

ARTMIP

Atmospheric River Tracking Method Intercomparison Project

ARTS

Atmospheric Radiative Transfer Simulator

AS

anvil stratus

ASAP-MS

atmospheric solids analysis probe mass spectrometry

ASC

arctic stratus cloud

ASCAT

Advanced SCATterometer

ASCII

American Standard Code for Information Interchange file format

ASCOS

Arctic Summer Cloud Ocean Study

ASD

analytical spectral devices

ASIR

absolute scanning infrared radiometer

ASIVA

All Sky Infrared Visible Analyzer

ASM

Asian summer monsoon

ASO

Airborne Snow Observatory

ASOP

atmospheric soil organic particles

ASOS

automatic surface observing system

ASP

Atmospheric Science Program

ASPEN

Atmospheric Sounding Processing Environment (NCAR software)

ASR

aerosol scattering ratio or absorbed solar radiation or absorbed shortwave radiation or absolute sky-scanning radiometer

ASRC

Atmospheric Sciences Research Center

ASSIST

Atmospheric Sounder Spectrometer for Infrared Spectral Technology

ASSP

axially scattering spectrometer probe

ASTER

Atmosphere-Surface Turbulent Exchange Research or Advanced Spaceborne Thermal Emission and Reflection Radiometer (NASA)

ASTEX

Atlantic Stratocumulus Transition Experiment

ASTI

absolute solar transmittance interferometer

ASTIC

All Sky Thermal Infrared Camera

ATD

Atmospheric Technology Division (NCAR) or Arizona test dust

ATDD

Atmospheric Turbulence and diffusion Division (NOAA ARL)

ATHAM

Active Tracer High-resolution Atmospheric Model

ATLID

Atmospheric backscatter lidar

ATM

Atmospheric Transport Model

ATMIS-II

Atmospheric Moisture Comparison Study

ATML

Atmospheric and Terrestrial Mobile Laboratory

ATMOS

Atmospheric Trace Molecule Spectroscopy or Argonne Testbed for Multiscale Observational Studies

ATMS

Advanced Technology Microwave Sounder

ATOFMS

aerosol time-of-flight mass spectrometer

ATOM

Atmospheric Tomography Mission

ATOMIC

Atlantic Tradewind Ocean-Atmosphere Mesoscale Interaction Campaign

ATOMMS

Active Temperature, Ozone Moisture Microwave Spectrometer

ATR/FTIR

attenuated total reflectance-Fourier transform infrared

ATSR

Along-Track Scanning Radiometer

ATTREX

Airborne Tropical Tropopause Experiment

AUSMI

Australian monsoon index

AVA

ARM Volume-Imaging Array

AVG

Adaptive Vertical Grid

AVHRR

advanced very-high-resolution radiometer

AVIRIS

airborne visible and infrared imaging spectrometer

AVMP

atmospheric vertical moisture profile

AVOC

anthropogenic volatile organic carbon

AVP

ARM Aerial Vehicles Program *As of February 2009, this program was renamed ARM Aerial Facility.

AVSET

Automated Volume Scan Evaluation and Termination

AVTP

atmospheric vertical temperature profile

AWARE

ARM West Antarctic Radiation Experiment

AWEX

AIRS Water Vapor Experiment

AWIPS

Advanced Weather Interactive Processing System

AWPAG

All-Weather Precipitation Accumulation Guage

AWS

automated weather station

AZA

azimuth angle

B

BACI

Biosphere Atmosphere Change Index

BAECC

Biogenic Aerosols - Effects on Clouds and Climate

BAECC SNEX

Biogenic Aerosols--Effects on Clouds and Climate: Snowfall Experiment

BAERI

Bay Area Environmental Research Institute

BAMEX

Bow Echo and Mesoscale Convective Vortices Experiment

BAMS

Bulletin of the American Meteorological Society

BAO

Boulder Atmospheric Observatory

BAPMoN

Background Air Pollution Monitoring

BARC

Barrow Arctic Research Center

BARFEX

Boardman Atmospheric Radiation Flux Experiment

BARRA

Australian Bureau of Meteorology Atmospheric high-resolution Reginal Reanalysis for Australia

BAS

British Antarctic Survey

BASE

Beaufort Arctic Storms Experiment

BASE-A

Biomass Burning Airborne and Spaceborne Experiment in the Amazonas

BASTA

Bistatic rAdar SysTem for Atmospheric studies

BATS

Biosphere-Atmosphere Transfer Scheme

BATSE1

Biosphere-Atmosphere Transfer Scheme, Version 1e

BB

biomass burning

BBA

biomass burning aerosols

BBCEAS

broadband cavity enhanced absorption spectrometer

BBHRP

broadband heating rate profile

BBOA

biomass burning organic aerosol

BBOP

Biomass Burning Observation Project

BBSS

balloon-borne sounding system

BC

black carbon

BC4

Boston College-Aerodyne led Coated Black Carbon Study

BCADS

Black Carbon Aerosol Deposition Study

BCL

buoyant condensation level

BCO

Barbados Cloud Observatory

BCP

backscatter cloud probe

BCR

baseline change request

BCS

Bayesian Compressive Sensing

BDRF

bidirectional reflectance functions

BEACH-ON-ROMBAS

Biohydro-atmosphere interactions of Energy, Aerosols, Carbon, H2O, Organics & Nitrogen Rocky Mountain Biogenic Aerosol Study

BECCS

bioenergy with carbon capture and storage

BEO

Barrow Environmental Observatory

BER

Biological and Environmental Research

BESST

Ball Experimental Sea Surface Temperature instrument

BF

boundary facility

BGC

biogeochemistry

BIC

Bayesian Information Criterion

BIOS

Bermuda Institute of Ocean Sciences

BL

boundary layer

BLC

Belfort laser ceilometer or boundary layer convection

BLCWG

Boundary Layer Cloud Working Group (GCSS)

BLH

boundary layer height

BLISS

Boundary Layer Sensing and Simulation working group

BLOSSOM

Bilateral Operational Storm-Scale Observation and Modeling

BLX

Boundary Layer Experiment

BMRC

Bureau of Meteorological Research Center

BNL

Brookhaven National Laboratory

BOEMRE

Bureau of Ocean Energy Management, Regulation, and Enforcement

BOM

Australian Bureau of Meteorology

BOMEX

Barbados Oceanographic and Meteorological Experiment

BORCAL

broadband outdoor radiometer calibration

BOREAS

Boreal Ecosystem-Atmosphere Study

BRDF

bidirectional reflectance distribution function

BRS

broadband radiometer station

BSA

Beaufort Sea Anticyclone

BSISO

boreal summer intraseasonal oscillation

BSOA

biogenic secondary organic aerosol

BSRN

baseline surface radiation network

BSRWP

beam-steered radar wind profiler

BT

back trajectory or brightness temperature

BTD

brightness temperature difference

BVOC

biogenic volatile organic compound

C

C-LAMP

Carbon-Land Model Intercomparison Project

C-MAN

Coastal-Marine Automated Network

C4MIP

Coupled Climate-Carbon Cycle MIP

C5H8

isoprene

CAA

Clean Air Act (U.S.) or cloud absorption anomaly

CABL

Characterizing the Atmospheric Boundary Layer

CaChUP

Chemical Analyzer for Charged Ultrafine Particles

CACTI

Cloud, Aerosol, and Complex Terrain Interactions

CAD

computer-aided design

CAF

cloud area fraction

CAFS

Coupled Arctic Forecasting System

CAGATE

CCPP-ARM GCM analysis of tendency errors

CAGEX

CERES/ARM/GEWEX Experiment

CAICE

Center for Aerosol Impacts on Chemistry of the Environment (National Science Foundation)

CAIPEEX-2009

Cloud Aerosol and P:recipitation Enhancement Experiment

CALIOP

Cloud-Aerosol Lidar with Orthogonal Polarization

CALIPSO

Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation

CALM

Circumpolar Active Layer Monitoring Grid

CalNex

California Nexus of Air Quality and Climate Experiment

CALVAL

Calibration and Validation

CAM

Community Atmosphere Model or convection-allowing model

CAM-4

NCAR Community Atmosphere Model Version 4

CAM-5

NCAR Community Atmosphere Model

CAM-MAM

PNNL Modal Aerosol Model

CAM5-CAPT

Community Atmosphere Model version 5.1-Cloud-Associated Parameterizations Testbed

CAMEL

Combined ASTER MODIS Emissivity over Land

CAMEX

Convection and Moisture Experiment

CAMS

Copernicus Atmosphere Monitoring Service

CANDAC

Canadian Network for Detection of Atmospheric Change

CANSISE

Canadian Sea Ice and Snow Evolution Network

CAO

cold-air outbreak

CAP-MBL

Cloud, Aerosol, and Precipitation in the Marine Boundary Layer

CAPE

convective available potential energy or Convection and Precipitation/Electrification experiment

CAPE-K

Clouds and Precipitation Experiment at Kennaook

CAPI

cloud-aerosol-precipitation interactions

CAPMoN

Canadian Air and Precipitation Monitoring Network

CAPPI

Constant Altitude Plan Position Indicators

CAPRICORN

Clouds, Aerosols, Precipitation, Radiation, and Atmospheric Composition over the Southern Ocean

CAPS

cloud, aerosol, and precipitation spectrometer or cavity attenuated phase shift

CAPS-PMEX

cavity attenuated phase shift extinction monitor

CAPT

Cloud-Associated Parameterization Testbed

CAR

corrective action report

CARB

California Air Resources Board

CARES

Carbonaceous Aerosol and Radiative Effects Study

CARI

Community Airborne Research Instrumentation

CARL

CART Raman lidar

CARMA

Community Aerosol-Radiation-Microphysics Application or Community Aerosol and Radiation Model for Atmospheres

CARRIBA

Cloud, Aerosol, Radiation, and Turbulence in the Trade Wind Regime over Barbados

CARSNET

China Aerosol Remote Sensing Network

CART

Cloud and Radiation Testbed

CARVE

Carbon in Arctic Reservoirs Vulnerability Experiment

CAS

cloud aerosol spectrometer

CASA

Carnegie-Ames-Stanford Approach or Collaborative Adaptive Sensing of the Atmosphere

CASCC

Caltech Active Strand Cloud water Collector

CASES

Cooperative Atmosphere Surface Exchange Study or Canadian Arctic Shelf Exchange Study

CASS

Continental Active Surface-Forced Shallow Cumulus

CAST

Co-ordinated Airborne Studies in the Tropics

CASTNET

Clean Air Status and Trend Network

CAUSES

Cloud Above the United States and Errors at the Surface

CAVM

Circumpolar Arctic Vegetation map

CAWCR

Centre for Australian Weather and Climate Research

CAWS

Canadian Arctic Weather Science

CBG

Chebogue Point (Canada)

CBH

cloud base height

CBL

convective boundary layer

CCAP

Characterization of Cirrus and Aerosol Properties

CCCMA

Canadian Centre for Climate Modelling and Analysis

CCD

charge-coupled device

CCEW

convectively coupled equatorial waves

CCI

Climate Change Initiative (ESA)

CCIE

Coastal Convective Interaction Experiment

CCM

climate chemistry model

CCM1

Community Climate Model, Version 1

CCM2

Community Climate Model, Version 2

CCM3

Community Climate Model, Version 3

CCMI

Chemistry Climate Modeling Initiative

CCN

cloud condensation nuclei

CCPM

cyclic convection-permitting model

CCPP

Climate Change Prediction Program

CCS

cold cloud system

CCSEM/EDX

computer-controlled scanniing electron microscopy/energy-dispersive X-ray spectroscopy

CCSM2

Community Climate System Model, Version 2

CCSP

Climate Change Science Program or Carbon Cycle Science Plan

CCSS

California Cooperative Snow Survey

CDA

constrained data assimilation

CDAAC

Constellation Observing System for Meteorology, Ionosphere, and COSMIC Data Analysis and Archive Center

CDE

CART data environment

CDER

cloud droplet effective radius

CDF

cumulative distribution function

CDFS

Cloud Depiction Forecast System (USAF)

CDIAC

Carbon Dioxide Information Analysis Center

CDL

cloud detection lidar or coherent Doppler lidar

CDMS

Cloud Droplet Measurement System

CDNC

cloud droplet number concentration

CDP

cloud droplet probe or control/display panel

CDR

circular depolarization ratio or Critical Design Review

CDR-MIP

Carbon Dioxide Removal Model Intercomparison Project

CDS

cloud drop spectrometer

CDSD

cloud droplet size distribution

CE

collection efficiency

CEAREX

Coordinated Eastern Arctic Experiment

CEAS

cavity enhanced absorption spectroscopy

CED

cloud equivalent diameter

CEDS

Community Emissions Data System

CEES

Committee on Earth and Environmental Sciences

CEM

cloud ensemble model

CEOS

Committee on Earth Observation Satellites

CEP

cloud extinction probe

CEPEX

Central Equatorial Pacific Experiment

CERES

Clouds and the Earth's Radiant Energy System

CESAR

Cabauw Experimental Site for Atmospheric Research (Netherlands)

CESBIO

Centre d'Etudes spatiales de la BIOsphere (France)

CESD

Climate and Environmental Sciences Division

CESM

Community Earth System Model

CESM-LENS

Community Earth System Model Large Ensemble Project

CF

Central Facility or Climate and Forecast or cloud fraction

CFAD

contoured-frequency-by-altitude diagram

CFARR

Facility for Airborne Atmospheric Measurements (UK)

CFC

chlorofluorocarbon

CFCR

Centroid Frequency Chirp Rate

CFD

computational fluid dynamics

CFDC

continuous flow diffusion chamber

CFDE II

Canadian Freezing Drizzle Experiment II

CFH

cryogenic frost point hygrometer

CFI

cloud-free index or Canada Foundation for Innovation

CFMIP

Cloud Feedback Model Intercomparison Project

CFODD

Contoured Frequency by Optical Depth Diagram

CFP

carbon flux phenology

CFSR

Climate Forecast System Reanalysis (NCEP)

CFWI

Canadian Fire Weather Index

CGA

calibration, grooming, and alignment

CGCM

coupled (ocean-atmosphere) general circulation model

CGPS

Continuous Global Positioning System

CHAPS

Cumulus Humilis Aerosol Processing Study

CHARMS

CH4 Atmospheric Remote Monitoring

CHARTS

Code for High-Resolution Accelerated Radiative Transfer from Scattering

CHEESEHEAD19

Chequamegon Heterogeneous Ecosystem Energy-balance Study Enabled by a High-density Extensive Array of Detectors 2019

CHIVO

Colorado State University C-Band Hydrometeorological Instrument for Volumetric Observations

CI

convective initiation

CI-ITMS

ion trap mass spectrometer using chemical ionization

CIC

Cloudiness Intercomparison Campaign

CID

collision-induced dissociation

CIDS

CEPEX integrated data system

CIMMS

Cooperative Institute for Mesoscale Meteorological Studies

CIMS

chemical ionization mass spectrometer

CIMSS

Cooperative Institute for Meteorological Satellite Studies

CIN

convective inhibition

CINC

cloud ice number concentration

CINDY2011

Cooperative Indian Ocean Experiment on Intraseasonal Variability in Year 2011

CIP

column intensive properties or cloud imaging probe

CIR

cloud infrared radiometer

CIRA

Cooperative Institute for Research in the Atmosphere

CIRCCREX

Cirrus Coupled Cloud-Radiation Experiment

CIRES

Cooperative Institute for Research in Environmental Sciences (U. of Colorado)

CIRP

Cooperative Institute for Regional Prediction (University of Utah)

CIRPAS

Center for Interdisciplinary Remotely Piloted Aircraft Studies

CIWRO

Cooperative Institute for Severe and High-Impact Weather Research and Operations (University of Oklahoma)

CKE

cumulus kinetic energy or collisional kinetic energy

CL

convective precipitation over land

CLACE

Cloud and Aerosol Characterization Experiments

CLAMPS

Collaborative Lower Atmospheric Mobile Profiling System

CLAMS

Chesapeake Lighthouse and Aircraft Measurements for Satellites

CLAP

continuous light absorption photometer

CLARIFY-2017

Cloud-Aerosol-Radiation Interactions and Forcing: Year 2017

CLASIC

Cloud Land Surface Interaction Campaign or Chemistry Land-Surface Atmosphere Soil Slab

CLASS

Cross-Chain Loran Atmospheric Sounding System

CLASSIC

Coupled Large-scale Aerosol Simulator for Studies of Climate

CLAUS

Cloud Archive User Service

CLAVR

Cloud Advanced Very High-Resolution Radiometer

CLD

chemiluminescence detection

CLEAR

Colorado State University Lightning, Environment, Aerosol, and Radar analysis framework

CLEARFLO

Clean Air for London

CLEX

Complex Layered Cloud Experiment

CLI

command line interface

CLIMOB

CLImate Modelling and Observations in India

CLIVAR

Climate Variability and Predictability (Program)

CLM

Community Land Model or Common Land Model

CLOUD

Cosmics Leaving OUtdoor Droplets chamber (European Council for Nuclear Research)

CLOWD

Clouds with Low Optical (Water) Depths Working Group

CLP

cloud liquid path

CLRTAP

Convention on Long Range Trans-boundary Air Pollution

CLS

cloud and aerosol lidar system

CLUBB

Cloud Layers Unified By-Binormals

CLW

column liquid water

CLWG

Cloud Lifecycle Working Group

CLWP

cloud liquid water path

CM

cloud mask

CMAP

Climate Prediction Center Merged Analysis of Precipitation

CMAQ

Community Multiscale Air Quality model (EPA)

CMBE

Climate Modeling Best Estimate

CMC

Canadian Meteorological Centre

CMCC

Centro Euro-Mediterraneo per I Cambiamenti Climatici

CMCS

connected MCS

CMDEWP

chilled-mirror dew point hygrometer

CMDL

Climate Monitoring and Diagnostics Laboratory

CMDV

Climate Model Development and Validation Program (U.S. DOE)

CMFR

continuously mixed flow reactor

CMIP

Coupled Model Intercomparison Project

CML

cloud mixed layer

CMMG

Center of Climate, Meteorology, and Climate change (University of the Azores)

CMORPH

Climate Prediction Center Morphing Technique

CMSAF

Climate Monitoring Satellite Application Facility

CMT

convective momentum transport

CN

condensation nucleus

CNES

Centre National d'Etudes Spatiales

CNN

convolutional neural network

CNPq

Brazilian National Council for Scientific and Technological Development

CNRM-CERFACS

Centre National de Recherches Meteorologiques/Centre Europeen de Recherche et Formation Avancees en Calcul Scientifique

CNT

classical nucleation theory

Co₂FLX

carbon dioxide flux system

COALA

Coordinated Observations of the Lower Arctic Atmosphere

COALESCE

Carbonaceous aerosol emissions, source apportionment, and climate impacts (India)

COARE

Coupled Ocean Atmosphere Response Experiment

COBRA

CO2 Budget and Rectification Airborne stody

COD

cloud optical depth

CODE

Center for Orbit Determination in Europe

COLA

Center for Ocean-Land-Atmosphere Studies

COLMA

Colorado Lightning Mapping Array

COMBLE

Cold-Air Outbreaks in the Marine Boundary Layer Experiment

CombRet

Combined Retrieval

CoMeT

Coupling Metrics Toolkit

COMMAS

Collaborative Model for Multiscale Atmospheric Simulation

CONTRAST

CONvective TRansport of Active Species in the Tropics

CONUS

continental United States

COP

Cloud Organizational Potential

COPE

Convective Precipitation Experiment

COPS

Convective and Orographically-induced Precipitation Study

CORDEX

Coordinated Regional Climate Downscaling Experiment

COSMIC

Constellation Observing System for Meteorology, Ionosphere, and Climate

COSP

CFMIP Observation Simulator Package

CoSSIR

Compact Scanning Submillimeter-wave Imaging Radiometer (NASA)

COT

cloud optical thickness

CP

Cloud Properties Working Group

CPC

Climate Prediction Center or condensation particle counter

CPI

cloud particle imager

CPM

Cloud Parameterization and Modeling or convection-permitting model

CPMA

centrifugal particle mass analyzer

CPOL

C-band polarimetric radar

CPPAR

cylindrical polarimetric phased array radar

CPRS

cloud profiling radar system

CPT

cold point tropopause

CPW

Cloud Properties Working Group

CQI

continuous quality improvement

CR-SIM

Cloud Resolving Model Radar Simulator

CRAICC

Nordic Centre of Excellence

CRD

cavity ring-down

CRD-AES

cavity ring down aerosol extinction spectrometer

CRDS

cavity ring-down spectroscopy

CRE

cloud radiative effect

CRF

cloud radiative forcing

CRH

column relative humidity

CRHF

cloud radiative heat forcing

CrIS

Cross-track Infrared Sounder

CRL

compact Raman lidar

CRM

cloud-resolving model or column radiation model

CROC

Convective Radio Occultations Campaign

CRREL

Cold Regions Research and Engineering Laboratory (U.S. Army Corps of Engineers)

CRS

Clouds and Radiative Swath

CRYSTAL-FACE

Cirrus Regional Study of Tropical Anvils and Cirrus Layers—Florida Area Cirrus Experiment

CS

cloudscope

CSA

convective-stratiform-anvil

CSCE

Continental Stratocumulus Experiment (Pennsylvania State University)

CSD

cloud size distribution

CSET

Cloud System Evolution in the Trades

CSHNET

Chinese Sun Hazemeter Network

CSI

cloud spectrometer and impactor or clear-sky identification

CSIP

Convective Storm Initiation Project

CSIRO

Commonwealth Scientific and Industrial Research Organization

CSLAEX

Cross-Scale Land-Atmosphere Experiment

CSM1

Climate System Model, Version 1

CSP

Combined Sensor Program

CSPHOT

cimel photometer

CSPOT

camel sun photometer

CSRM

cloud system-resolving model

CSTRIPE

Coastal Stratocumulus Imposed Perturbation Experiments

CSU

Colorado State University

CSU-MAPS

California State University mobile atmospheric profiling system

CSWR

Center for Severe Weather Research

CT

cloud thickness

CTBL

cloud-topped boundary layer or cumulus-topped boundary layer

CTD

cloud-top divergence

CTEI

cloud-top entrainment instability

CTFS

Center for Tropical Forest Science

CTH

cloud top height

CTL

CarbonTracker-Lagrange

CTM

chemical transport model

CTP

convective triggering potential

CTT

cloud-top temperature

CTV

cloud-top vertical vorticity

Cu

cumulus

CuPIDO

Cumulus Photogrammetric, In situ, and Doppler Observations

CUT

Coordinated Universal Time

CVDP

Climate Variability Diagnostic Package (NCAR)

CVE

coherent vorticity extraction

CVF

cloud vertical fraction

CVI

counter-flow vertical impactor

CW3E

Center for Western Weather and Water Extremes

CWC

condensed water content

CWP

cloud water path

CWV

columnar water vapor

CZO

Critical Zone Observatory

D

DAAC

Distributed Active Archive Center

DABUL

depolarization aerosol and backscatter unattended lidar

DACAPO-PESO

Dynamics, Aerosol, Cloud And Precipitation Observations in the Pristine Environment of the Southern Ocean

DACCIWA

Dynamics-aerosol-chemistry-cloud interactions in West Africa

DAII

droplet assisted inlet ionization mass spectrometry

DALES

Dutch Atmospheric Large Eddy Simulation model

DAO

data assimilation office

DAQ

data acquisition

DARE

direct aerosol radiative effect

DARF

direct aerosol radiative forcing

DART

discrete angle radiative transfer or Data Assimilation Research Testbed (NCAR)

DAWEX

Darwin Wave Experiment

DBS

Dichroic Beam Splitter

DBSCAN

Density-Based Spatial Clustering of Applications with Noise

DC3

Deep Convective Clouds and Chemistry

DCC

deep convective cloud

DCP

downward control principle

DCPP

Decadal Climate Prediction Project

DDA

discrete dipole approximation

DDI

downwelling diffuse irradiance

DDR

diffuse-to-direct ratio

DDV

differential Doppler velocity

DEAD

Dust Entrainment and Deposition Model

DEID

differential emissivity imaging disdrometer

DEM

digital elevation model

DER

droplet effective radius

DESI

desorption electrospray ionization

DESI-HRMS

desorption electrospray ionization high-resolution mass spectrometry

DESI-MS

desorption electrospray ionization mass spectrometry

DEW

distant early warning

DFAR

double-fence automated reference

DFB TDL

distributed feedback tunable-diode laser

DFDI

diffuse downward irradiance

DFG

Deutsche Forschungsgemeinschaft (German Research Foundation)

DFIR

double-fence intercomparison reference

DFR

dual-frequency reflectivity ratio

DFT

density functional theory

DGVM

dynamic global vegetation model

DHARMA

Distributed Hydrodynamic Aerosol and Radiative Modeling Application

DHI

diffuse horizontal irradiance

DHR

differential heating rate

DI

deionized

DIAL

differential absorption lidar

DICE

Diurnal Land/Atmosphere Coupling Experiment

DIRTMAP

Dust Indicators and Records in Terrestrial and Marine Paleoenvironments database

DISCOVER-AQ

Deriving Information on Surface conditions from Column and Vertically Resolved Observations Relevant to Air Quality

DISORT

discrete ordinate radiative transfer

DLCA

diffusion-limited cluster aggregation

DLF

downwelling longwave flux

DLH

diode laser hygrometer

DLPNO

domain-based local pair-natural orbital

DLR

Deutsches Zentrum fur Luft- und Raumfahrt (German Aerospace Center)

DLS

dynamic light scattering

DMA

differential mobility analyzer or Defense Mapping Agency

DMAN

Dynamic Model for Aerosol Nucleation

DMF

Data Management Facility or dry air mole fraction

DMO

Danish Meteorological Institute

DMPS

differential mobility particle sizer

DMS

Data Management System

DMSP

Defense Meteorological Satellite Program

DMT

Data Management Team or Droplet Measurement Technologies

DNI

direct normal irradiance

DNN

deep neural network

DNS

direct numerical simulation

DNSI

direct-normal solar irradiance

DOAS

differential optical absorption spectroscopy

DOC

dissolved organic carbon

DOD

data object design

DOE

U.S. Department of Energy

DOF

depth of field

DOFS

degree of freedom for signal

DOI

Digital Object Identifier

DOLCE

Derived Optimal Linear Combination Evapotranspiration

DOMEX

Dominica Experiment

DOP

dioctyl phthalate

DOS

dioctyl sebacate

DOW

Doppler on wheels: dual-polarization X-band Doppler radar

DOY

day of year

DPR

dual-frequency precipitation radar

DPV

diesel-powered vehicles

DQ

Data Quality

DQ HandS

Data Quality Health and Status

DQAR

Data Quality Assessment Report

DQM

Data Quality Manager

DQMS

Data Quality Management System

DQO

Data Quality Office

DQPR

Data Quality Problem Report

DQR

Data Quality Report

DR

depolarization ratio

DRE

direct radiative effect

DRF

direct radiative forcing or direct radiative feedback or diurnal mean radiative forcing

DRFE

diurnal mean radiative forcing efficiency or diffuse radiation fertilization effect

DRI

Desert Research Institute

DRUM

Davis Rotating-drum Universal-size-cut Monitoring

DRUM-CP

DRUM with Cold Plate

DSC

directed scattering coefficients

DSD

drop size distribution

DSE

dry static energy

DSIT

Data and Science Integration Team

DSLR

digital single-lens reflex

DSP

digital signal processor

DTLB

drained thaw lake basin

DTR

diurnal temperature range

DTS

distributed temperature sensing

DUP

dust uplift potential

DVD

Doppler velocity difference

DVM

dynamic vegetation model

DWR

dual-wavelength ratio

DYAMOND

Dynamics of the Atmospheric general circulation Modeled on Non-hydrostatic Domains

DYCOMS-II

Second Dynamics and Chemistry of Marine Stratocumulus Experiment

DYMECS

Dynamical and Microphysical Evolution of Convective Storms

DYNAMO

Dynamics of the Madden-Julian Oscillation (MJO)

DYPTOP

Dynamical Peatland Model Based on TOPMODEL

E

E-AIM

Extended Aerosol Inorganics Model

E3SM

Energy Exascale Earth System Model

EA

environmental assessment

EAGLES

Enabling aerosol-cloud interactions at global convection-permitting scales

EAMv1-RRM

Energy Exascale Earth System Model Atmosphere Model version 1 Regionally Refined Model

EARLINET

European Aerosol Research Lidar Network

EASE

Equal-Area Scalable Earth grid

EASM

East Asian summer monsoon

EASOE

European Arctic Stratospheric Ozone Experiment

EAST-AIRC

East Asian Studies of Tropospheric Aerosols and Impact on Regional Climate

EAST-AIRE

East Asian Study of Tropospheric Aerosols: an International Regional Experiment

EB

energy balance

EBBR

energy balance bowen ratio

EBM

energy balance model

EBWDM

entropy-based wavelet denoising method

EC

Experiment Center or eddy correlation or eddy covariance or Environment Canada or elemental carbon

ECC

electrochemical cell

ECCC

Environmental and Climate Change Canada

ECDL

external cavity diode laser

ECHM

European Centre Hamburg Model

ECL

elastic cloud lidar

ECLIPS

Experimental Cloud Lidar Pilot Study

ECMWF

European Centre for Medium-Range Weather Forecasts

ECOR

eddy correlation or eddy correlation flux measurement system

ECOSTRESS

ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station

ECPC

Experimental Climate Prediction Center (Scripps Institution of Oceanography)

ECPP

Explicit-Cloud Parameterized-Pollutant

ECR

Engineering Change Request

ECRP

Early Career Research Program (DOE)

ECS

equilibrium climate sensitivity or effective climate sensitivity

ECV

essential climate variable

ED

experiment design

EDAS

Eta Data Assimilation System

EDC

EROS Data Center (USGS)

EDDI

Evaporative Demand Drought Index

EDGAR

Emissions Database for Global Atmospheric Research

EDM

environmental dust monitor

EDMF

eddy-diffusivity/mass-flux

EDR

energy dissipation rate

EDS

energy dispersive spectroscopy

EDX

energy dispersive X-ray spectroscopy

EDXMA

energy dispersive X-ray microanalysis

EECRA

Extended Edited Synoptic Cloud Reports Archive

EELS

electron energy loss spectroscopy

EEPROM

electrically erasable programmable read-only memory

EERE

Office of Energy Efficiency and Renewable Energy (U.S. Department of Energy)

EESI

extractive electrospray ionization

EF

extended facility or evaporative fraction or emission factor

EF/TEM

energy filtered/transmission electron microscopy

EFEDA

European Field Experiment in a Desertification-threatened Area

EGA

evolved gas analysis

EGF

ethanol growth factors

EGU

electric generation unit

EI

electron ionization

EIL

entrainment interfacial layer

EIS

estimated inversion strength

EKE

eddy kinetic energy

EL

equilibrium level

ELF

extremely low frequency

ELP

evaporated liquid particle

ELVOC

extremely low-volatility organic compound

EM

electron microscopy

EM-MIC

electromagnetic-microphysical

EMEP

European Monitoring of Environmental Pollution program or European Monitoring and Evaluation Programme

EMERALD

Egrett Microphysics Experiment with Radiation, Lidar, and Dynamics

EMEX

Equatorial Mesoscale Experiment

EML

Environmental Measurements Laboratory (DOE)

EMPM

explicit mixing parcel model

ENA

Eastern North Atlantic

ENCORE

ENsemble ClOud Retrieval

EnKF

ensemble adjustment Kalman filter

ENP/A

Eastern North Pacific/Atlantic

ENSO

El Nino-Southern Oscillation

ENTLN

Earth Networks Total Lightning Network

ENVI

Environment for Visualizing Images

ENVSAT

ESA earth observation satellite (now inactive)

EOF

empirical orthogonal functions

EOL

Earth Observing Laboratory (NCAR)

EOM

Easter Ocean Margin (CART site)

EOP

experiment operation plan or extended operational period

EOS

Earth Observing System

EPA

U.S. Environmental Protection Agency

EPCAPE

Eastern Pacific Cloud Aerosol Precipitation Experiment

EPIC

Eastern Pacific Investigation of Climate

EPLAB

The Eppley Laboratory, Inc.

EPRI

Electric Power Research Institute

ER

ecosystem respiration

ERASMUS

Evaluation of Routine Atmospheric Sounding Measurements using Unmanned Systems

ERAST

Environmental Research Aircraft and Sensor Technology (NASA)

ERBE

Earth Radiation Budget Experiment

ERF

effective radiative forcing

ERL

Environmental Research Laboratory

ERL (SGP site)

Electronics Repair Laboratory

ERM

eddy-resolving model

EROS

earth sciences resources observation systems

ERS-1

European research satellite-1

ESA

European Space Agency or enhanced sounding array

ESC

electrified shower cloud

ESCAPE

Experiment of Sea Breeze Convection, Aerosols, Precipitation and Environment

ESFT

exponential sum fitting of transmission (technique)

ESGF

Earth System Grid Federation

ESI

electrospray ionization

ESLCS

Enhanced Soundings for Local Coupling Studies

ESM

Earth System Modeling (U.S. DOE program)

ESM-SnowMIP

Earth System Model Snow Model Intercomparison Project

ESMF

Earth System Modeling Framework

ESMValTool

Earth System Model Evaluation Tool

ESP

Earth System Predictability

ESRL

Earth System Research Laboratory (NOAA)

ESS-DIVE

Environmental System Science Data Infrastructure for a Virtual Ecosystem

ESTAR

electronically scanned thinned array radiometer

ESTARFM

Enhanced Spatial and Temporal Adaptive Reflectance Fusion Model

ET

evapotranspiration

ETA/EDAS

ETA Data Assimilation System

ETH

echo top height

ETL

Environmental Technology Laboratory (NOAA)

ETM+

enhanced thematic mapper plus

EUC

Equatorial Undercurrent

EUCREM

European Cloud-Resolving Modeling

EUCREX

European Cloud and Radiation Experiment

EUFAR

European Facility for Airborne Research

EUMETSAT

European Organisation for the Exploitation of Meteorological Satellites

EUREC4A

Elucidating the Role of Clouds-Circulation Coupling in Climate

EUROCS

European Project for Cloud Systems Studies

EUSAAR

European Supersites for Atmospheric Aerosol Research

EVI

enhanced vegetation index

EVS

Earth Venture Suborbital

EWO

Engineering Work Order

ExINP-SGP

Examining the Ice-Nucleating Particles from Southern Great Plains

F

FAA

Federal Aviation Administration

FAAM

Facility for Airborne Atmospheric Measurements (UK)

FACE

Free-Air Carbon dioxide Enrichment

FAD

frequency-by-altitude diagram

FAIR

Findable, Accessible, Interoperable, and Reusable

FAN

Federated Aerosol Network (NOAA)

FAO

Flatland Atmospheric Observatory

FARLAB

Facility for Advanced Isotopic Research and Monitoring of Weather, Climate and Biogeochemical Cycling (University of Bergen, Norway)

FARMS

Fast All-sky Radiation Model for Solar applications

FARMS-DNI

Fast All-sky Radiation Model for Solar applications with Direct Normal Irradiance

FASCODE

Fast Atmospheric Signature Code

FASE

FASCODE for the environment

FASINEX

First Air-Sea Interaction Experiment

FASTER

FAst-physics System TEstbed and Research (a BNL project)

FBAP

fluorescent biological aerosol particle

FC

IISCCP Flux Cloud

FCC

fractional cloud cover

FCCSET

Federal Coordinating Council on Science, Engineering, and Technology

FCDP

fast cloud droplet probe

FDDA

four-dimensional data assimilation

FDTD

finite-dimensional data assimilation or finite-difference time domain

FE-SEM

field emission scanning electron microscope

FFP

Flux Footprint Prediction

FFSSP

fast-forwarding scattering spectrometer probe

FFT

fast Fourier transform

FFV

factorized finite volume

FIA

Forest Inventory and Analysis

FIDO

Field Instrument Deployments and Operations

FIDUCEO

Fidelity and Uncertainty in Climate Data record from Earth Observations

FIE

first aerosol indirect effect

FIFE

First ISLSCP Field Experiment

FIGAERO

filter inlet for gases and aerosols

FIMS

fast integrating mobility spectrometer

FIR

finite impulse response

FIRE

First ISCCP Regional Experiment

FireMIP

Fire Modeling Intercomparison Project

FIREX-AQ

Fire Influence on Regional to Global Environments and Air Quality campaign

FIRMS

Fire Information for Resource Management System (NASA)

FIRST

Far-Infrared Spectroscopy of the Troposphere

FLAASH

Fast Line-of-Sight Atmospheric Analysis of Hypercubes

FLAME-IV

Fourth Fire Lab at Missoula Experiment

FLEXTRKR

Flexible Object Tracker

FLOR

Forecast-Oriented Low Ocean Resolution

FLRT

flexible, longwave, radiative transfer

FMCW

Frequency Modulated Continuous Wave

FMF

fine mode fraction

FMI

Finnish Meteorological Institute

FNMOC

Fleet Numerical Meteorology and Oceanography Center

FONSI

finding of no significant impact

FOO

frequency of occurrence

ForestGEO

Forest Global Earth Observatory

FORJ

fiber optic rotary joint

ForTraCC

Forecasting and Tracking the evolution of Cloud Clusters

FOV

field of view

FPAR

fraction of photosynthetically active radiation

FPH

frost point hygrometer

fps

frames per second

FRAM-IF

Fog Remote Sensing and Modeling-Ice Fog

FROST

Front Range Orographic Storms

FRP

fire radiative power

FRSR

fast rotating shadowband radiometer

FSBR

fractional solar broadband radiometer

FSD

fractional standard deviation

FSL

Forecast Systems Laboratory (NOAA)

FSSP

forward scattering spectrometer probe

FT

free troposphere

FT-ICR

Fourier transform ion cyclotron resonance

FTIR

fourier transform infrared radiometer

FTRH

free tropospheric relative humidity

FTS

Fourier transform spectrometer

FWHM

full width at half maximum

FWI

Fractional Water Index

FWSC

fair-weather shallow cumulus

FY

Fiscal Year

FZL

freezing level

G

GA

Geoscience Australia or genetic algorithm

GAC

global area coverage

GALE

Genesis of Atmosphere Lows Experiment

GALION

GAW Aerosol LIdar Observing Network

GAPD

Geiger-mode avalanche photo diode detector

GAPEX

Ground-based Atmospheric Profiling Experiment

GAPP

GEWEX Americas Prediction Project

GARP

Global Atmospheric Research Program

GASS

global atmospheric system studies

GATE

GARP Atlantic Tropical Experiment

GAUS

GPS Advanced Upper-Air Sounding System

GAW

Global Atmosphere Watch

GC-ECD

gas chromatograph-electron capture detector

GC-ITMS

gas chromatograph ion trap mass spectrometer

GC-MS

gas chromatograph-mass spectrometer

GCCN

giant cloud condensation nuclei

GCD

Global Charcoal Database

GCE

Goddard Cumulus Ensemble model

GchM-O

Global Chemistry Model driven by observed meteorology

GCIP

GEWEX Continental-Scale International Project

GCM

General Circulation Model

GCMS

gas chromatography mass spectrometry

GCOS

Global Climate Observing System

GCPM

global convection-permitting model

GCSS

GEWEX Cloud System Study

GCW

Global Cryosphere Watch

GDAL

Geospatial Data Abstraction Library

GDAS

Global Data Assimilation System

GDEM

Global Digital Elevation Model

GEA

generic enhanced absorption

GEBA

Global Energy Balance Archive

GEC

global electric circuit

GECKO-A

Generator of Explicit Chemistry and Kinetics of Organics in the Atmosphere

GEDI

Global Ecosystem Dynamics Investigation

GEFS

Global Ensemble Forecast System

GEISA

Gestion et Etude des Informations Spectroscopiques Atmospheriques

GEM

Global Ecosystem Monitoring network or Global Environmental Multiscale model

GEMS

Global Environmental Monitoring System

GENESIS

Global Environmental and Ecological Simulation of Interactive Systems

GEOS

Goddard Earth Observing System

GERB

Geostationary Earth Radiation Budget

GES DISC

Goddard Earth Sciences Data and Information Services Center (NASA)

GEWEX

Global Energy and Water Experiment

GF

growth factor

GFA

geophysical focus area

GFAS

Global Fire Assimilation System

GFDL

Geophysical Fluid Dynamics Laboratory

GFED

Global Fire Emissions Database

GFEM

Galerkin finite element method

GFS

Global Forecasting System (NCEP)

GHCN

Global Historic Climatology Network

GHI

global horizontal irradiance

GIEMS

Global Inundation Extent from Multi-Satellites

GIF

Guest Instrument Facility (at ARM SGP site)

GIFTS

Geostationary Imaging Fourier Transform Spectrometer

GIIRS

Geostationary Interferometric Infrared Sounder

GIM

geostatistical inverse modeling

GIPSY-OASIS

GNSS-Inferred Positioning System and Orbit Analysis Simulation Software

GIS

geophysical information system

GISS

Goddard Institute for Space Studies

GIST

GEWEX Integrated System Test

GLACE

Global Land-Atmosphere Coupling Experiment

GLAFOS

GEWEX Land-Atmosphere Feedback Observatories

GLAS

Geoscience Laser Altimeter System

GLASS

Global Land-Atmosphere System Study

GLCTS

Global Land Cover Test Site

GLDAS

Global Land Data Assimilation System

GLEAM

Global Land Evaporation Amsterdam Model

GLENS

Geoengineering Large Ensemble Project

GLM

generalized linear model or Geostationary Lightning Mapper

GLO

ground-level ozone

GloBEIS

Global Biosphere Emissions and Interactions System

GLODAP

Global Ocean Data Analysis Project

GLOMAP

Global Model of Aerosol Processes

GMAO

Global Modeling and Assimilation Office (NASA)

GMCC

Geophysical Monitoring for Climate Change (NOAA)

GMD

Global Monitoring Division

GMI

GPM Microwave Imager

GMMIP

Global Monsoon Model Intercomparison Project

GMS

geostationary meteorological satellite or gross moist stability

GMSL

Global Mean Sea Level

GMST

global mean surface temperature

GMT

Greenwich Mean Time

GNDRAD

ground radiometers on stand for upwelling radiation

GNDVI

green normalized difference vegetation index

GNSS

Global Navigation Satellite System

GO-SHIP

Global Ocean Ship-based Hydrographic Investigations Program

GOALS

global-ocean-atmosphere-land-system

GOAMAZON

Observations and Modeling of the Green Ocean Amazon

GOBM

global ocean biogeochemical model

GOCART

Goddard Chemistry Aerosol Radiation and Transport model

GODAS

Global Ocean Data Assimilation System

GOES

Geostationary Operational Environmental Satellite

GoMACCS

Gulf of Mexico Atmospheric Composition and Climate Study

GOME

Global Ozone Monitoring Experiment

GOSAT

Greenhouse gases Observing SATellite

GPCC

Global Precipitation Climatology Centre

GPCI

GCSS Pacific Cross-Section Intercomparison

GPCP

Global Precipitation Climatology Project

GPH

geopotential height

GPM

Global Precipitation Measurement mission (NASA)

GPM DPR

Global Precipitation Measurement Dual-frequency Precipitation Radar

GPP

gross primary productivity

GPR

Gaussian Processes Regression

GPS

global positioning system

GPS RO

global positioning system radio occultation

GPV

gasoline-powered vehicles

GRACE

Gravity Recovery And Climate Experiment

GRAMS

ground radiation measurement system

GRDC

Global Runoff Data Center

GrIS

Greenland Ice Sheet

GRIST

Global-to-Regional Integrated forecast System

GRMDM

Generalized Refractive Mixing Dielectric Model

GROGRAT

Gravity wave Regional OR Global Ray Tracer model

GRUAN

GCOS Reference Upper-Air Network

GRVI

green-red vegetation index

GSA

global sensitivity analysis

GSAT

global surface air temperature

GSD

geometric standard deviation

GSFC

Goddard Space Flight Center

GSI

Gridpoint Statistical Interpolation

GSL

Global Systems Laboratory

GSM

global spectral model

GSPO

Global Studies Program Office

GSRM

global storm-resolving model

GSWP3

Global Soil Wetness Project 3

GTC

growth tube collector

GTE/ABLE

Global Tropospheric Experiment/Atmospheric Boundary Layer Experiment

GTS

global telecommunications system

GUAN

GCOS Upper Air Network or German Ultrafine Aerosol Network

GUI

graphical user interface

GVAP

GEWEX Water Vapor Project

GVAX

Ganges Valley Aerosol Experiment

GVD

gradient of Doppler velocity

GVF

Greenness Vegetation Fraction

GVR

G-band (183 GHz) vapor radiometer

GVRP

G-band (183 GHz) vapor radiometer profiler

GWTSA

gamma-weighed two-stream approximation

H

HadGEM2-ES

Hadley Centre Global Environmental Model version 2, earth system configuration

HadISST

Hadley Centre Sea Ice and Sea Surface Temperature data set

HADS

Hydrometeorological Automated Data System

HAFS

Hurricane Analysis and Forecasting System

HAIC-HIWC

High Altitude Ice Crystals-High Ice Water Content Project

HALOE

Halogen Occultation Experiment

HAMSR

high-altitude MMIC sounding radiometer

HAPEX

Hydrology Atmosphere Pilot Experiment

HARIMAU

Hydrometeorological Array for Interseasonal Variation-Monsoon Automonitoring

HARP

HIAPER Airborne Radiation Package or Hawaiian Warm Rain Project

HATPRO

Humidity and Temperature Profiler

HAWKS

HITRAN Atmospheric Workstation

HBL

hurricane boundary layer

HBMI

Howard Beltsville MWR Intercomparison

HCA

hydrometeor classification algorithm

HCF

heated condensation framework

HCFC

hydrofluorocarbon

HCR

HIAPER Cloud Radar or horizontal convective roll

HD(CP)2

High-Definition Cloud and Precipitation for Advancing Climate Prediction

HDF

Heirarchical Data Format

HDOP

Horizontal dilution of precision

HDPE

high-density polyethylene

HDR

high dynamic range

HEA

high-energy approximation

HEPA

high-efficiency particulate air (filter)

HERB

Hydrologic Cycle and Earth Radiation Budget

HEVI

Horizontally Explicit Vertically Implicit

HFC

hydrofluorocarbon

HFIP

Hurricae Forecasting Improvement Project (NOAA)

HGF

hygroscopic growth factors

HI-SCALE

Holistic Interactions of Shallow Clouds, Aerosols, and Land-Ecosystems

HIAPER

High-performance Instrumented Airborne Platform for Environmental Research

HighResMIP

High-Resolution Model Intercomparison Project

HiLaMS

High-Latitude Measurement of Snowfall

HiLAT-RASM

High-Latitude Application and Testing of Earth System Models-Regional Arctic System Model (DOE)

HINC

horizontal ice nucleation chamber

HIPPO

HIAPER Pole-to-Pole Observations

HiRAM

High-Resolution Atmospheric Model

HIRLAM

high-resolution limited area model

HIRS

High-Resolution Infrared Radiation Scanner

HIS

high-resolution interferometer spectrometer or hyperspectral imaging

HITRAN

high-resolution transmission

HiWATER

Heihe watershed allied telemetry experimental research

HL

high latitude

HMQC

heteronuclear multiple quantum coherence

HMT

hydrometeorological testbed

HOA

hydrocarbon-like organic aerosol

HOBE

Hydrological Observatory and Exploratorium (Danish)

HOLODEC

holographic detector for clouds

HOM

highly oxidized molecule or highly oxygenated molecule or Holmes Moss (UK)

HOMME

High Order Method Modeling Environment

HONER

hemispherical optimized new radiometer

HOPE

High-Definition Clouds and Precipitation Observational Prototype Experiment or Hamburg Ocean Primitive Equation

HPLC

high-performance liquid chromatography

HPR

high-pressure ridge

HR

heating rate

HR ToF-CIMS

high-resolution time-of-flight chemical ionization mass spectrometer

HR-ESI/MS

high-resolution electrospray ionization mass spectrometry

HRDL

high-resolution doppler lidar

HRLDAS

High-Resolution Land Data Assimilation System

HRMS

high-resolution mass spectrometry

HRRR

High-Resolution Rapid Refresh

HSD

hydrometeor size distribution

HSFOVR

hemispherical field of view radiometer

HSI

hemispheric sky imager

HSRHI

hemispheric range height indicator

HSRL

high-spectral-resolution lidar

HSVD

hydrometeor velocity size detector

HTAP

Hemispheric Transport of Air Pollution emissions inventory

HTDMA

hygroscopic tandem differential mobility analyzer

HUCM

Hebrew University of Jerusalem Cloud Model

HULIS

humic-like substances

HUMEX -- I

Humidity Experiment - Infrared

HVPS

high-volume precipitation spectrometer

HVSD

hydrometer velocity and shape detector

HWRF

Hurricane Weather Research and Forecasting

HWT

Hazardous Weather Testbed (NOAA)

HYSPLIT

Hybrid Single-Particle Lagrangian Integrated Trajectory

I

IABP

International Arctic Buoy Programme

IAGOS

In-service Aircraft for a Global Observing System or In-flight Atmospheric Observing System

IAM

incidence angle modifier or integrated assessment model

IAMAS

International Association of Meteorology and Atmospheric Science

IAP

in situ aerosol profile

IARPC

Interagency Arctic Research Policy

IASC-AWG

International Arctic Science Committee-Atmosphere Working Group

IASI

infrared atmospheric sounding interferometer

IASOA

International Arctic Systems for Observing the Atmosphere

IATA

International Air Transport Association

IAV

interannual variability

IBBCEES

Incoherent Broadband Cavity Enhanced Extinction spectrometer

IBTrACS

International Best Track Archive for Climate Stewardship

IC

ion chromatography

ICA

independent column approximation

ICAMS

Interagency Council for Advancing Meteorological Services

ICARTT

International Consortium for Atmospheric Research on Transport and Transformation

ICARUS

Inaugural Campaigns for ARM Research using Unmanned Systems

ICCAGRA

Interagency Coordinating Committee for Airborne Geosciences Research and Applications (U.S. Government)

ICE

Interface Configuration Experiment

ICE-L

Ice in Clouds Experiment-Layers

ICE-T

Ice in Clouds Experiment-Tropical

ICEALOT

International Chemistry Experiment in the Arctic Lower Troposphere

ICECAPS

e Integrated Characterization of Energy, Clouds, Atmospheric state, and Precipitation at Summit Program

ICESat

Ice, Clouds, and Land Elevation Satellite

ICI

Infrared Cloud Imager

ICICLE

In-Cloud Icing and Large-drop Experiment

ICL

integrated cloud liquid or interband cascade laser

ICOADS

International Comprehensive Ocean-Atmosphere Data Set

ICOS

Integrated Carbon Observation System or Integrated Cavity Output Spectroscopy

ICP

inductively coupled plasma-based techniques

ICP-AES

inductively coupled plasma atomic emission spectroscopy

ICP-OES

inductively coupled plasma-optical emission spectroscopy

ICPM

International Commission on Polar Meteorology

ICPR

integrated cross-polarization ratio

ICRCCM

Intercomparison of Radiation Codes in Climate Models

ICTP

Abdus Salam International Center for Theoretical Physics

IDASS

integrated data assimilation and sounding system

IDEAS-2011

Instrumentation Development and Education in Airborne Science 2011 (NSF)

IDL

interactive data language

IDP

Instrument Development Program

IEEE

Institute of Electrical and Electronics Engineers

IEPOX SOA

isoprene-epoxydiol-derived secondary organic aerosol

IF

intermediate frequency or ice fog

IFA

intensive flux array

IFFExO

Ice Fog Field Experiment at Oliktok Point

IFN

ice-forming nuclei

IFO

intensive field observation

IFOV

instantaneous field of view

IFREMER

Institut Francais pour la Recherche et l'Exploitation de la MER

IGAC

International Global Atmospheric Chemistry Project

IGB

Indo-Gangetic Basin

IGBP

International Geosphere Biosphere Programme

IGE

Institut des Geosciences de L'Environnement

IGIM

Interagency Group on Integrative Modeling

IGOM

improved geometric optics method

IGP

Indo-Gangetic Plain

IGR

inherent growth rate

IGRA

Integrated Global Radiosonde Archive (NOAA)

IGS

International GNSS Service

IGW

inertio-gravity wave

IHOP

International H2O Project

IIASA

International Institute for Applied Systems Analysis

IIDC

Instrumentation and Industrial Digital Camera

IIOE

International Indian Ocean Expedition

IITM

Indian Institute of Tropical Meteorology

ILAMB

International Land Model Benchmarking

ILS

instrument line shape

ILW

integrated liquid water

IMB

Infrastructure Management Board

IMBIE

Ice Sheet Mass Balance Inter-comparison Exercise

IMD

Indian Meteorological Department

IMERG

Integrated Multi-satellite Retrievals for Global Precipitation Measurement

IMFC

integrated moisture flux convergence

IMG

Interferometric Monitor of Greenhouse Gases

IMMS

Instrument Mentor Monthly Summary

IMPACT

Integrated Massively Parallel Atmospheric Chemistry Transport model

IMPACTS

Investigation of Microphysics and Precipitation for Atlantic Coast-Threatening Snowstorms

IMPROVE

Interagency Monitoring of Protected Visual Environments (U.S.) or Improvement of Microphysical Parameterization through Observational Verification Experiment

IMR

ice mixing ratio

IMS

Interactive Multisensor Snow and Ice Mapping System or ion mobility spectrometry

IN

ice nuclei

INAS

ice nucleation active site

INCA

Interhemispheric difference in cirrus properties from anthropogenic emissions

INDOEX

Indian Ocean Experiment

INFLAME

In situ Net Flux with the Atmosphere of Earth

INP

ice-nucleating particle

INPA

Instituto Nacional de Pesquisas da Amazonia

INPE

Instituto Nacional de Pesquisas Espaciais

INPOP

Ice Nucleating Particles at Oliktok Point

INRA

Institut National de la Recherche Agronomique (France)

INS

Inertial Navigation System

INSTAAR

Institute of Arctic and Alpine Research

INTERACT

International Network for Terrestrial Research and Monitoring in the Arctic

INTEX-B

Intercontinental Chemical Transport Experiment-Phase B

InvCM

inverse climate modeling

IOD

Indian Ocean dipole

IOP

intensive operational period

IOT

Internet of things

IPA

independent pixel approximation

IPAS

ice particle aggregate simulator

IPASRC

International Pyrgeometer and Absolute Sky-scanning Radiometer Comparison

IPC

International Pyrheliometer Comparison

IPCC

Intergovernmental Panel on Climate Change

IPEX

Intermountain Precipitation Experiment

IPHEX

integrated Precipitation and Hydrology Experiment

IPM

instrument performance model

IPMA

Instituto Portugues do Mar e da Atmosfera

IPN

integrated photoacoustic-nephelometer

IPO

Interdecadal Pacific Oscillation

IPRC

International Pacific Research Center

IPSL

Institut Pierre-Simon Laplace

IPY

International Polar Year

IR

infrared

IRBT

infrared brightness temperature

IRF

instantaneous radiative flux

IRGA

infrared gas analyzer

IRI

International Research Institute for Climate and Society

IRICP

International Research Institute for Climate Prediction

IRIS

integrating sphere infrared radiometer

IRISS

Integrated Remote and In Situ Sensing

IRSI

infrared sky imager

IRT

infrared thermometer

IS

ice spectrometer

ISAN

isentropic analysis

ISAR

Infrared Sea Surface Temperature Autonomous Radiometer

ISCCP

International Satellite Cloud Climatology Project

ISDAC

Indirect and Semi-Direct Aerosol Campaign

ISHMAEL

Ice-Spheroids Habit Model with Aspect-Ration Evolution

ISIMIP

Inter-Sectoral Impact Model Intercomparison Project

ISIS

Integrated Surface Irradiance Study

ISLAS

Isotopic Links to Atmospheric Water's Sources

ISLSCP

International Satellite Land Surface Climatology Project

ISM

Indian summer monsoon

ISMAR

International Sub-millimeter Airborne Radiometer

ISMIP

Ice Sheet Model Intercomparison Project

ISMN

International Soil Moisture Network

ISO

International Organization for Standardization or intraseasonal oscillation

ISOPOOH

isoprene hydroxy hydroperoxide

ISRO

Indian Space Research Organization

ISS

integrated sounding system

ISTI

International Surface Temperature Initiative

ISVHE

Intraseasonal Variability Hindcast Experiment

ISWP

intraseasonal westward-propagating signal

IT

instrument team

ITCZ

intertropical convergence zone

ITEX

International Tundra Experiment or Island Thunderstorm Experiment

ITF

Intertropical Front

ITOP

Intercontinental Transport of Ozone and Precursors experiment

ITP

Ice-tethered profiler

ITPP

International TOVS Processing Package

IVOC

intermediate-volatility organic compound

IVT

integrated vapor transport

IWC

ice water content

IWP

ice water path

IWRF

Integrated Weather Radar Facility

IWV

integrated water vapor

J

JACCS

Japanese Cloud and Climate Study

JAMSTEC

Japanese Agency for Marine-Earth Science and Technology

JASMINE

Joint Air-Sea Monsoon Interaction Experiment

JAXA

Japan Aerospace Exploration Agency

JD

Julian Day

JFD

joint frequency distribution

JHWRP

Joint Hawaiian Warm Rain Project

JISAO

Joint Institute for the Study of the Atmosphere and Ocean

JOSS

Joint Office for Science Support

JOYCE

Julich Observatory for Cloud Evolution (Germany)

JPEG

Joint Photographic Expert Group file format

JPL

Jet Propulsion Laboratory (NASA)

JPSS

Joint Polar Satellite System

JULES

Joint UK Land Environment Simulator

JWD

Joss-Waldvogel disdrometer

K

KaRVIR

Ka-band rapid volume imaging radar

KASPR

Ka-band scanning polarimetric radar

KBDI

Keetch-Byram Drought Index

KDE

kernel density equivalent

KDGPAPS

Kennaook/Cape Grim Baseline Air Pollution Station

KF-CuP

Kain--Fritsch cumulus potential

KM-SUB

kinetic multi-layer model of aerosol surface and bulk chemistry

KNMI

Royal Netherlands Meteorological Institute

KRAQNb

Korea Air Quality Network

KSC

Kennedy Space Center (NASA)

KWAJEX

Kwajalein Field Experiment

L

LA

land-atmosphere

LAAPTOF

laser ablation aerosol particle time-of-flight mass spectrometer

LABLE

Lower Atmospheric Boundary Layer Experiment

LAC

light-absorbing carbon

LACIS

Leipzig Aerosol Cloud Interaction Simulator

LACO

Laboratory for Aerosol and Cloud Optics

LAFE

Land-Atmosphere Feedback Experiment

LAI

leaf area index

LAII

land-atmosphere-ice-interactions

Lake-ICE

Lake-Induced Convection Experiment

LAMPAS

laser mass analysis of particles in the airborne state

LAMS

limited area models

LANCE

Land, Atmosphere Near real-time Capability for EOS (NASA)

LANDSAT-TM

Land Satellite Thematic Mapper

LANL

Los Alamos National Laboratory

LAOC

light-absorbing organic carbon

LAPS

Local Analysis and Prediction System or light-absorbing particles

LARC

Langely Research Center (NASA)

LAS

laser aerosol spectrometer

LASE

Lidar Atmospheric Sensing Experiment

LASIC

Layered Atlantic Smoke Interactions with Clouds

LASPLAST

Leicester Along-Track Scanning Radiometer and Sea Surface Temperature Radiometer Processor for Land Surface Temperature

LASSO

LES ARM Symbiotic Simulation and Observation

LBA

Large-Scale Biosphere-Atmosphere Experiment in Amazonia

LBCL

liquid-bearing cloud layer

LBL

line-by-line

LBLRTM

Line-By-Line Radiative Transfer Model

LBNL

Lawrence Berkeley National Laboratory

LBTM

Layered Bispectral Threshold Method

LCHLS

Land Cover Heterogeneity Length Scale

LCL

lifting condensation level

LDAR

Lightning Detection and Ranging

LDAS

Land Data Assimilation Project

LDEO

Lamont-Doherty Earth Observatory

LDI

laser desorption ionization

LDIS

laser disdrometer

LDLS

laser-driven light source

LDN

Lightening Detection Network (U.S.)

LDR

linear depolarization ratio

LE

latent energy

LEADEX

Lead Experiment

LED

light-emitting diode

LED-CE-DOAS

light-emitting diode cavity-enhanced differential optical absorption spectroscopy

LEM

Lagrangian-Eulerian Model

LES

large-eddy simulation

LFC

level of free convection

LGM

last glacial maximum

LH

latent heat

LHF

latent heat flux

LI

lifted index

LIF

laser-induced fluorescence or laser-induced fluorescence

LIFT

Lidars in Flat Terrain Experiment

LII

laser-induced incandescence

LIM

linear inverse model

LIMS

Limb Infrared Monitor of the Stratosphere

LINDA

LED-Based Ice Nucleation Detection Apparatus

LIP or Lightning Instrument Package (NASA)

localized intensification of precipitation

LIRAD

lidar-infrared radiometer

LIS

Land Information System (NASA)

LITE

Lidar In-space Technology Experiment

LLJ

low-level jet

LLNL

Lawrence Livermore National Laboratory

LMA

Lightning Mapping Array

LMB

level of maximum buoyancy

LMD

Laboratoire de Meteorologie Dynamique or level of maximum detrainment

LMMS

laser microprobe mass spectrometry

LMOS

Lake Michigan Ozone Study

LMS

least median squares

LN

liquid nitrogen

LNA

low noise amplifier

LNB

level of neutral buoyancy

LoCo

Local Land-Atmosphere Coupling project

LOD

limit of detection

LOESS

locally estimated scatterplot smoothing

LOPES

long path extinction spectrometer

LP DAAC

Land Processes Distributed Active Archive Center

LPDM

Lagrangian Particle Dispersion Model

LPI

low-pressure impactor

LPL

lifted parcel layer

LPM

liters per minute or laser precipitation monitor

LPRM

Land Parameter Retrieval Model

LPVEX

Light Precipitation Validation Experiment

LRT

long-range transport or local recommendation team

LRU

lowest replaceable units (spare/replacement parts)

LS-SP-AMS

light-scattering soot particle aerosol mass spectrometer

LS3MIP

Land Surface, Snow and Soil Moisture Model Intercomparison Program

LSAT

land surface air temperature

LSCE

Laboratoire des Sciences du Climat et l'Environnement (France)

LSE

land surface emissivity

LSFEM

least-squares finite element method

LSM

land surface model

LSN

light snow

LSP

land surface parameterization or light scattering particle

LST

local solar time or local standard time or land surface temperature

LTE

local thermodynamic equilibrium

LTER

Long-Term Ecological Research Network

LTS

lower tropospheric stability

LUC

land use category

LUCID

Land-Use and Climate, IDentification of robust impacts

LUE

light use efficiency

LULCC

land use and land cover change

LUMIP

Land Use Model Intercomparison Project

LUT

look up table

LV-OOA

low-volatility oxygenated organic aerosol

LVOC

low-volatility organic compound

LW

longwave

LWC

liquid water content

LWCF

longwave cloud forcing

LWDN

Surface downward longwave radiation

LWE

liquid water equivalent

LWP

liquid water path

LWR

longwave radiation

LWSI

land surface water index

LWUP

surface upward longwave radiation

M

M-O

Monin-Obukhov

M-PACE

Mixed-Phase Arctic Cloud Experiment

MAAP

multiple angle absorption photometer

MAAS

Multisensor Agile Adaptive Sampling

MABNAG

Model for Acid-Base chemistry in NAnoparticle Growth

MAC

mass absorption cross-section or mass absorption coefficient

MACC

Monitoring Atmospheric Composition and Climate

MACE

Multi-Spectral Atmospheric Column Extinction

MACPEX

Middle Latitude Airborne Cirrus Properties Experiment

MADE

Model Aerosol Dynamics Model for Europe

MADRID

Model of Aerosol Dynamics, Reaction, Ionization, and Dissolution

MAE

mass absorption efficiency or mean absolute error

MAERI

marine atmospheric emitted radiance interferometer

MAGIC

Marine ARM GPCI Investigation of Clouds

MAGICC

Measurement of Atmospheric Gases Influencing Climate Change

MAIAC

Multi-Angle Implementation of Atmospheric Correction (MODIS)

MALS

multi-angle elastic light scattering

MAM

Modal Aerosol Module

MAPP

Modeling, Analysis, Prediction and Projection (NOAA program) or microphysical aerosol properties from polarimetry

MAPR

multiple antenna profiling radar

MAPS

Mesoscale Analysis and Prediction System

MAQNET

multi-scale air quality network

MARCUS

Measurement of Aerosols, Radiation and Clouds over the Southern Oceans

MAS

MODIS airborne simulator

MASC

Multi-Angle Snowflake Camera

MASE

MArine Stratus Experiment

MASRAD

Marine Stratus Radiation Aerosol and Drizzle

MAST

Monterey Area Ship Track Experiment

MATCH

Model for Atmosphere Transport and Chemistry

MAX-Mex

Megacity Aerosol eXperiment - Mexico City

MBA

marine biogenic aerosol

MBE

mean bias error

MBL

marine boundary layer

MC3E

Midlatitude Continental Convective Clouds Experiment

MCAO

marine cold air outbreak

MCBH

multiple cloud base height

MCC

mesoscale convective complex or mesoscale cellular convection

MCE

modified combustion efficiency or mesoscale cloud ensemble

MCICA

Monte Carlo Independent Column Approximation

MCIDAS

man-computer interactive data analysis system

MCM

Master Chemical Mechanism

MCMC

Markov chain Monte Carlo

MCMS

Modeling, Analysis and Prediction Climatology of Midlatitude Storminess database (NASA)

MCPC

mixing condensation particle counter

MCS

mesoscale convective system

MCSST

multichannel sea surface temperature

MCTEX

Maritime Continent Thunderstorm Experiment

MDF

model-data fusion

MDFA

microfluidic droplet freezing array

MDN

meta data navigator

mdr

minimum detectable radiance

MDS

meta data system

MDTERP

Maryland Terrestrial Radiation Package

MDV

mean Doppler velocity

ME

modulation efficiency

MED

mass equivalent diameter

MEE

mass extinction efficiency

MEFO

Manitou Experimental Forest Observatory

MEGAN

Model of Emissions of Gases and Aerosols from Nature

MEIC

Multi-resolution Emission Inventory for China

MERIS

medium-resolution imaging spectrometer

MERRA

Modern Era Retrospective Analysis for Research and Applications

MESH

maximum expected size of hail

MET

Meteorological Instrumentation at AMF

MetUM

Met Office Unified Model (UK)

MEX

Mexico City

MFC

moisture flux convergence or mass flow controller

MFP

mean-free-path

MFR

multi-filter radiometer

MFRIRT

multifilter radiometer and infrared thermometer

MFRSR

multi-filter rotating shadowband radiometer

MHS

Microwave Humidity Sounder

MHz

megahertz

MICA

Morphological Index of Convective Aggregation

MICRE

Macquarie Island Cloud and Radiation Experiment

MidCiX

Midlatitude Cirrus Experiment

MILAGRO

Megacity Initiative: Local and Global Research Observations

MIMD

multiple instruction multiple data

miniSPLAT

miniaturized single-particle mass spectrometer

MINT

Microfluidic Ice Nucleation Technique

MINX

MISR Interactive Explorer

MIP

model intercomparison project

MIPS

mobile integrated profiling system

MIR

millimeter-wave imaging radiometer

MIRAGE

Model for Integrated Research on Atmospheric Global Exchanges

MIROC

Model for Interdisciplinary Research on Climate

MIRS

Microwave Integrated Retrieval System

MISI

Marine Ice Sheet Instability

MISMO

Mirai Indian Ocean Cruise for the Study of the MJO Convection Onset

MISO

monsoon intraseasonal oscillation

MISR

multi-angle imaging spectroradiometer

MISS

mobile integrated sounding system

MIST

multiple instruments stackable tower

MIZ

marginal ice zone

MIZOPEX

Marginal Ice Zone Observations and Processes Experiment

MJO

Madden-Julian Oscillation

MJY

Mellor-Yamada-Janjic (a PBL modeling scheme)

ML

mixing layer or melting layer or machine learning

MLC

multi-layer clouds

MLD

mixed-layer depth

MLR

multinominal logistic regression

MLS

mid-latitude summer or microwave limb sounder

MLW

mid-latitude winter

MM

mobile mesonet

MM5

Mesoscale Meteorology model version 5

MMCR

millimeter wave cloud radar or multimode cloud radar

MMD

mean mass diameter

MMF

multi-scale modeling framework

MMIC

monolithic microwave integrated circuit

MMR

mass mixing ratio

MMTP

microwave temperature profiler

MNMB

modified normalized mean biases

MNSP

multiplicative-noise stochastic physics

MOA

marine organic aerosol or memorandum of agreement

MOAPP

Multi-Object Analysis of Atmospheric Phenomenon

MOAS

Microwave Oxygen Absorption Study

MOC

meridional overturning circulation

MOCCHA

Microbiology-Ocean-Cloud Coupling in the High Arctic

MODIS

moderate-resolution imaging spectroradiometer

MODM

monochromatic optical depth

MODTRAN

moderate-resolution atmospheric radiance and transmittance model

MOHC

Met Office Hadley Centre (UK)

MOI

micro-orifice impactor

MOLTS

model output location time series

MOONLIGHT

Monoterpene and Oxygenated aromatic Oxidation at Night and under LIGHTS

MOP

memorandum of participation

MOPA

master oscillator power amplifier

MOPC

miniaturized optical particle counter

MOPD

maximum optical path difference

MOPEX

Model Parameter Estimation Experiment

MOPITT

measurements of pollution in the troposphere

MOR

Meteorological Optical Range

MOSAIC

Model for Simulating Aerosol Interactions and Chemistry or Multidisciplinary drifting Observatory for the Study of Arctic Climate

MOST

Monin-Obukhov similarity theory

MOU

memorandum of understanding

MOUDI

micro-orifice uniform deposit impactor

MOUDI-DFT

Multi-Orifice Uniform Deposition Impaction - Droplet Freezing Technique

MOVI

micro-orifice volatilization impactor

MOZAIC

Measurement of Ozone and Water Vapor by Airbus in-service Aircraft

MOZART

Model for Ozone and Related chemical Tracers

MPAS

Model for Prediction Across Scales

MPC

mixed-phase cloud

MPE

maximum permisiable exposure or multisensor precipitation estimate

MPEG

Moving Picture Expert Group file format

MPEX

Mesoscale Predictability Experiment

MPI

Max Planck Institute or Message Passing Interface

MPI-M

Max Planck Institute for Meteorology

MPIC

Max Planck Institute for Chemistry

MPIR

multi-spectral pushbroom imaging radiometer

MPL

micropulse lidar

MPM

Millimeter-wave Propagation Model

MPSS

mobility particle size spectrometer

MRAS

mesoscale radiatively-induced anvil spreading

MRC

Mission Research Corporation

MRDSS

McGill Radar Doppler Spectra Simulator

MRF

medium-range forecast

MRG

mixed Rossby-gravity

MRI

Meteorological Research Institute (Japan) or magnetic resonance imaging

MRMS

multi-radar multi-sensor

MRO

maximum-random overlap

MRR

micro rain radar

MS

marine stratus

MS-DA

Multiscale Data Assimilation

MSC

multichannel scaler card

MSE

moist static energy

MSFES

Mie solution for equivalent spheres

MSG

Meteosat Second Generation

MSL

mean sea level

MSLP

mean sea level pressure

MSMM

measurement system maturity matrix

MSS

multi-spectral scanner

MSSA

multi-channel singular spectral analysis

MsTMIP

Multi-scale Synthesis & Terrestrial Model Intercomparison Project

MSX

Mid-Course Space Experiment

MTBS

Monitoring Trends in Burn Severity data set

MTP

microwave temperature profiler

MTVDI

Modified Temperature Vegetation Dryness Index

MUCAPE

most unstable convective available potential energy

MUCIN

most-unstable convective inhibition

MWISP

Mount Washington Icing Sensors Program

MWMFOC

multi-wavelength multifield of view

MWR

microwave radiometer

MWR3C

microwave radiometer, 3-channel

MWRP

microwave radiometer profiler

MWSR

microwave water substance radiometer

MYNN

Mellor-Yamada-Nakanishi-Niino planetary boundary-layer parameterization scheme

N

N-ICE

Norwegian Young Sea Ice Experiment

NAAMES

North Atlantic Aerosols and Marine Ecoystems Study

NAAPS

Navy Aerosol Analysis and Prediction System

NAAQS

National Ambient Air Quality Standard

NAB

National Allergy Bureau

NADA

North American Drought Atlas

NAEI

National Atmospheric Emissions Inventory (UK)

NAIS

neutral air ion spectrometer

NALMA

North Alabama Lightning Mapping Array

NAM

North American Model or Northern Annular Mode

NAME

Nocturnal Avian Migration Experiment or North American Monsoon Experiment

NAMMA

NASA African Monsoon Multidisciplinary Analyses

NAMS

nanoaerosol mass spectrometer

NAO

North Atlantic Oscillation

NARCCAP

North American Regional Climate Change Assessment Program

NARE

North Atlantic Regional Experiment

NARL

Naval Arctic Research Laboratory

NARR

North American Regional Reanalysis

NAS

National Academy of Science (U.S.)

NASA

National Aeronautics and Space Administration

NASCENT

Ny-Alesund Aerosol Cloud Experiment

NASDA

Japanese National Space Development Agency

NAST-I

NPOESS Aircraft Sounding Testbed-Interferometer

NATO

North Atlantic Treaty Organization

NAVGEM

Navy Global Environmental Model

NAVMETOC

Naval Meteorology and Oceanography

NBL

nocturnal boundary layer

NBP

net biosphere productivity

NCAR

National Center for Atmospheric Research

NCAS

NOAA Center for Atmospheric Sciences or National Centre for Atmospheric Science (UK)

NCC

Norwegian Climate Centre

NCCS

NASA Center for Climate Simulation

NCDC

National Climatic Data Center

NCEI

National Centers for Environmental Information

NCEO

National Centre for Earth Observation (UK)

NCEP

National Centers for Environmental Prediction

NCEP GFS

National Centers for Environmental Prediction Forecasting System

NCFR

narrow cold-front rainband

NCO

Nepal Climate Observatory

NCP

Normalized Coherent Power

NCSS

National Cooperative Soil Survey

NDACC

Network for the Detection of Atmospheric Composition Change

NDBC

National Data Buoy Center

NDFD

National Digital Forecast Database

NDIR

nondispersive infrared

NDNR

normalized differences of nadir reflectivity

NDSVI

normalized difference senescent vegetation index

NDTI

normalized difference tillage index

NDVI

Normalized Difference Vegetation Index

NEAQS

New England Air Quality Study

NEAX

Northeast Aerosol Experiment

NED

National Elevation Dataset

NEDIS

National Environmental Satellite Data and Information Service (NOAA)

NEE

net ecosystem exchange

NEI

National Emissions Inventory (U.S. EPA)

NEON

National Ecological Observatory Network

NEP

noise equivalent power or net ecosystem production

NEPA

National Environmental Policy Act of 1969

NERC

National Environment Research Council (UK)

NERSC

National Energy Research Scientific Computing Center (DOE)

NESDIS

National Environmental Satellite, Data, and Information Service

NetCDF

Network Common Data Form

NEWS

NASA Energy and Water cycle Study

NEXAFS

near-edge X-ray absorption fine structure

NEXRAD

next-generation weather radar

NFOV

narrow field of view

NGA

National Geospatial-Intelligence Agency

NGEE

Next-Generation Ecological Experiment or Next-Generation Ecosystem Experiments

NGMS

Normalized Gross Moisture Stability

NGRIP

North Greenland Ice Core Project

NGS

National Geodetic Survey

NGWOS

Next Generation Water Observing System (USGS)

NH-SCE

Northern Hemisphere Snow Cover Extent data set

NIC

noninductive charging

NICAM

Nonhydrostatic Icosahedral Atmospheric Model

NIDIS

National Integrated Drought Information System

NIDS

NEXRAD Information Dissemination Service

NIEHS

National Institute of Environmental Health Sciences

NIES

Nauru Island Effect Study or National Institute for Environmental Studies (Japan)

NIGEC

National Institute for Global Environmental Change

NightFOX

Nighttime Fire Observations eXperiment

NILU

Norwegian Institute for Air Research

NIMFR

normal incidence multifilter radiometer

NIP

normal incidence pyrheliometer

NIPA

nonlocal independent pixel approximation

NIR

near infrared

NIST

National Institute of Standards and Technology

NLCD

National Land Cover Database

NLDAS

National Land Data Assimilation System

NLDN

National Lightning Detection Network

NLLJ

nocturnal low-level jet

NMASS

nucleation mode aerosol size spectrometer

NMB

normalized mean bias

NMC

National Meteorological Center

NMI

nonlinear multiscale interaction

NMQ

National Mosaic and Multisensor Quantitative Precipitation Estimation project

NMR

nuclear magnetic resonance

NMVOC

non-methane volatile organic compound

NNLS

non-negative least squares

NOA

nitrogen-enriched organic aerosol

NOAA

National Oceanic and Atmospheric Administration

NOCS

National Oceanography Centre, Southampton (UK)

NOGAPS

Navy Operational Global Atmospheric Prediction System

NOMADS

National Operational Model Archive and Distribution System (NOAA)

NORAD

North American Aerospace Defense Command

NORAPS

Navy Operational Regional Prediction System

NPF

new particle formation

NPFS

New Particle Formation Study

NPGO

North Pacific Gyre Oscillation

NPI

Norwegian Polar Institute

NPOESS

National Polar orbiting Operational Environmental Satellite System

NPOL

NASA Polerametric radar site in rutherford County, North Carolina

NPP

Net Primary Productivity

NR

noonrefractory

NRB

normalized relative backscatter

NRBC

NCAR radiation bias correction

NRCS

Natural Resources Conservation Service or normalized radar cross-section

NREL

National Renewable Energy Laboratory

NRT

near-real time

NSA

North Slope of Alaska

NSA/AAO

North Slope of Alaska and Adjacent Arctic Ocean

NSB

North Slope Borough

NSE

Nash-Sutcliffe Efficiency

NSERC

Natural Sciences and Engineering Research Council (Canada)

NSF

National Science Foundation

NSIDC

National Snow and Ice Data Center

NSRDB

National Solar Radiation Data Base

NSSL

National Severe Storms Laboratory

NSTC

National Science and Technology Council

NSWR

net shortwave radiation

NT

nontornadic storm

NTBC

narrow-to-broadband-conversion

NTP

Network Time Protocol

NU-WRF

NASA Unified Weather Research and Forecasting model

NUCAPS

NOAA-Unique Combined Atmospheric Processing System

NVAP

NASA Water Vapor Project

NVDI

normalized difference vegetation index

NWCSAF

Nowcasting Satellite Application Facilities (EUMETSAT)

NWO

Netherlands Organization for Scientific Research

NWP

numerical weather prediction

NWRT

National Weather Radar Testbed

NWS

National Weather Service

O

OA

organic aerosol

OAII

Ocean-Atmosphere-Ice-Interactions

OAP

optical array probe

OASIS

Ocean-Atmosphere-Sea-Ice-Snow experiment or Optical Array Shadow Imaging Software

OBER

Office of Biological and Environmental Research

OC

organic carbon

OC-CCI

Ocean Colour Climate Change Initiative

OceanRAIN

Ocean Rainfall and Ice-phase Precipitation Measurement Network

OCO

Orbiting Carbon Observatory

OCS

Oklahoma Climatological Society

OD

optical depth

ODAS

Ocean Data Assimilation System

ODE

ozone depletion event or ordinary differential equation

ODEQ

Oklahoma Department of Environmental Quality

ODR

Orthogonal Distance Regression

ODS

ozone-depleting substance

ODV

optical detection volume

OFR

oxidation flow reactor

OGP

Office of Global Programs

OHC

ocean heat content

OHF

ocean heat flux

OIN

other inorganic material

OISISAF

Ocean and Sea Ice Satellite Application Facility

OISST

Optimum Interpolation Sea Surface Temperature

OKM

Oklahoma Mesonet

OLCI

Ocean and Land Colour Instrument

OLR

outgoing longwave radiation

OLYMPEX

Olympic Mountain Experiment

OM

organic matter

OMAERUV

OMI/Aura Aerosol Optical Thickness & Single Scattering

OMB

Office of Management and Budget

OMI

Ozone Monitoring Instrument

OMIP

Ocean Models Intercomparison Project

OMT

ortho-mode transducer

OMWOG

Oceans-based Measurements Working Group

ONI

Oceanic Nino Index

ONR

Office of Naval Research

OOA

oxygenated organic aerosol

OPAC

Optical Properties of Aerosols and Clouds software package

OPALS

open-path ammonia laser sensor

OPC

optical particle counter

OPERA

Operational Program on the Exchange of Weather Radar Information

OPSS

optical particle sizing system

OPTICS

Ordering Points to Identify the Clustering Structure

ORACLES-2016

Observations of Aerosols above Clouds and their Interactions-2016

ORCAS

O2/N2 Ratio and CO2 Airborne Southern Ocean

ORG

optical rain gauge

ORNL

Oak Ridge National Laboratory

ORR

Operational Readiness Review

OSNAP

Overturning in the Subpolar North Atlantic Program

OSS

Operations Status System or optical spectral sampling

OSSE

observing system simulation experiment

OSTIA

Operational Sea Surface Temperature and Sea Ice Analysis

OSU

Oklahoma State University

OTDMA

organic tandem differential mobility analyzer

OTREC

Organization of Tropical East Pacific Convection

OVF

organic volume fraction

OVOC

oxygenated volatile organic compound

P

PA

photoacoustic

PABSI

profiling oxygen A-band spectrometer/visible integer

PACE

Plankton, Aerosol, Cloud, Ocean Ecosystem (NASA)

PAH

polycyclic aromatic hydrocarbon

PalEON

Paleo-Ecological Observatory Network

PALMS

particle analysis by laser mass spectrometry

PALS

Protocol for the Analysis for Land Surface models

PAM

portable automated mesonet

PAMARCMiP

Polar Airborne Measurements and Arctic Regional Climate Model Simulation Project

PAMR

profiling airborne microwave radiometer

PAMTRA

Passive and Active Microwave radiative TRAnsfer model

PAPE

perturbation available potential energy

PAQS

Pittsburgh Air Quality Study

PAR

photosynthetically active radiation or phased array radars

PaRaDIso

Payerne Radar and Isotopes

PARAGON

Progressive Aerosol Retrieval and Assimilation Global Observing Network

PARSEC

Pseudo-Adiabatic bin-micRophySics university of Exeter Cloud parcel model

PARSIVEL

Particle Size and Velocity disdrometer

PARSL

Pacific Northwest National Laboratory's Atmospheric Remote Sensing Laboratory

PartMc-MOSAIC

Particle Monte Carlo-Model for Simulating Aerosol Interactions and Chemistry

PAS

photo-acoustic absorption spectrometer or photoacoustic soot spectrometer

PAS2000CE

photoelectric aerosol sensor

PASCAL

Physical Feedbacks of Arctic Planetary Boundary Level Sea Ice, Cloud and Aerosol

PASS

Parameterization of Subgrid Scale or photoacoustic soot spectrometer

PASS-3

3-wavelength photo-acoustic soot spectrometer

PAX

photoacoustic extinctiometer

PBAP

primary biological aerosol particle

PBL

planetary boundary layer

PBLH

planetary boundary-layer height

PBO

Plate Boundary Observatory

PCASP

passive cavity aerosol spectrometer probe

PCB

printed circuit board

PCCP

Point Cloud of Cloud Points (ARM value-added product)

PCI

pressure control inlet

PCMDI

Program for Climate Model Diagnosis and Intercomparison

PCN

Permafrost Carbon Network

PCP

programmable compressor package

PCR

polymerase chain reaction

PCTM

Parameterized Chemical Transport Model

PCVI

pumped counterflow virtual impactor

PCWV

partial column water vapor

PDA

phase Doppler anemometry

PDF

probability distribution function or probability density function or Portable Document Format

PDI

phase Doppler interferometry

PDL

polarization diversity lidar

PDO/PCV

Pacific Decadal Oscillation/Variability

PDR

Preliminary Design Review

PDSI

Palmer drought severity index

PDV

Pacific Decadal Variability

PECAN

Plains Elevated Convection at Night

PEEX

Pan Eurasian Experiment

PEGASO

Plankton-derived Emissions of trace Gases and Aerosols in the Southern Ocean

PEGASUS

PNNL Eulerian Gas and Aerosol Scalable Unified System

PEM

Pacific Exploratory Mission

PERSIANN

Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks

PET

potential evapotranspiration

PETM

Paleocene-Eocene thermal maximum

PF

precipitation frequency

PFP

programmable flask package

PFT

plant functional type

PGF

Princeton Global Forcing

PGS

Precision Carbon Dioxide Mixing Ratio System or precision gas system

PHI

probabilistic hazard information

PHIPS

Particle Habit Imaging and Polar Scattering probe (Karlsruhe Institute of Technology)

PI

principal investigator

PI-Neph

Polarized Imaging Nephelometer

PIA

path-integrated attenuation

PICASSO

Parameterizing Ice Clouds using Airborne obServationS and triple-frequency dOppler

PICASSO-CENA

Pathfinder Instruments for Cloud and Aerosol Spaceborne Observations-Climatologie Etendue des Nuages et des Aerosols

PID

particle identification algorithm

PIF

problem identification form

PILPS

Project for the Intercomparison of Land-Surface Parameterization Schemes

PILS

particle-into-liquid sampler

PILS-IC

particle-into-liquid sampler coupled to ion chromatographs

PINE

Portable Ice Nucleation Experiment

PIOMAS

Pan-arctic Ice/Ocean Modeling and Assimilation System

PIP

Particle Imaging Package (NASA) or precipitation imaging package or primary ice production

PIR

precision infrared radiometer

PIRAQ

PC-integrated acquisition system

PISA

PECAN Integrated Sounding Array

PISTON

Propagation of Intraseasonal Oscillations

PIV

particle image velocimetry

PIXE

proton-induced X-ray emission

PKE

perturbation kinetic energy

PLSH

Process-based Land Surface Evapotranpiration/Heat Fluxes algorithm

PLUMBER

PALS Land Surface Model Benchmarking Evaluation Project

PM

particulate matter

PMEL

Pacific Marine Environmental Laboratory

PMF

positive matrix factorization

PMIP

Paleoclimate Model Intercomparison Project

PML

perfectly matched layer or Penman-Monteith-Leuning model

PMM

Pacific Measurement Mission (NASA)

PMO

Pico Mountain Observatory

PMS

particle measuring system

PMW

passive microwave

PNC

particle number concentration

PNG

Portable Network Graphics file format or Papua New Guinea

PNNL

Pacific Northwest National Laboratory

PNSD

particle number size distribution

POA

primary organic aerosol

POC

particulate organic carbon

POD

probability of detection

PODAAC

Physical Oceanography Distributed Active Archive Center (JPL)

POES

polar orbiting environmental satellite

POFA

probability of false alarm

POLARCAT

Polar Study using Aircraft, Remote Sensing, Surface Measurements and Models, of Climate, Chemistry, Aerosols, and Transport

POLARIS

Photochemistry of Ozone Loss in the Arctic Region in Summer

POLDER

Polarization and Directionality of the Earth's Reflectances

POLMIP

POLARCAT Model Intercomparison Project

POM

primary organic matter or particulate organic matter

POP

Parallel Ocean Program

POPEYE

Profiling at Oliktok Point to Enhance YOPP Experiments

POPS

printed optical particle spectrometer or portable optical particle spectrometer

POSIDON

Pacific Oxidants, Sulfur, Ice, Dehydration, and Convection Experiment

PPA

plane parallel approximation

PPI

plan position indicator

PPP

point-to-point protocol

PR

precipitation radar

PRB

Problem Review Board

PRE-STORM

Preliminary Regional Experiment for Stormscale Operational and Research Meteorology

Pre-VOCA

Preliminary VOCALS model Assessment

PRF

pulse repetition frequency

PRIMAVERA

Process-Based Climate Simulation: Advances in High-Resolution Modelling and European Climate Risk Assessment

PRISM

Parameter elevation Regression on Independent Slopes Model

PROBE

Pilot Radiation Observation Experiment

PROF

profile

Promis

Program for an Operational Meteorological Information System (Swedish Meteorological and Hydrological Institute)

PRP

Portable Radiation Package or phase retarding plate

PRR

pre-readiness review

PRT

pulse repetition time

PSA

particle surface area

PSAP

particle/soot absorption photometer

PSC

polar stratospheric cloud

PSD

particle size distribution or power spectral density

PSL

photo-stimulated luminescence or polystyrene latex

PSP

precision spectral pyranometer

PSR-EBL

Picosecond Short-Range Elastic Backscatter Lidar

PSU

Pennsylvania State University

PTI

photo-thermal interferometer or precipitation type index

PTIR

photothermal infrared spectroscopy

PTR-MS

proton transfer reaction mass spectrometer

PTR-ToF-MS

proton transfer reaction time-of-flight mass spectrometer

PV or photovoltaic

potential vorticity

PVI

particle video imager

PVM

particle volume monitor

PW

precipitable water

PWD

present weather detector

PWGA

population-weighted global average

PWRF

Polar Weather Research and Forecasting

PWS

present weather sensor

PWV

precipitable water vapor

PX

Pleim-Xiu model

PYE

Point Reyes, California

Q

Q-AMS

quadrupole aerosol mass spectrometer

QBO

Quasi-Biennial Oscillation

QC

Quality Control

QCL

quantum cascade laser

QCLCD

Quality Controlled Local Climatological Data (NOAA)

QCRAD

Data Quality Assessment for ARM Radiation Data value-added product

QFF

quartz fiber filter

QHA

quasi-harmonic approximation

QL

Quantitative Links

QME

Quality Measurement Experiment

QMOM

quadrature method of moments

QMS

quadrupole mass spectrometer

QNSE

quasi-normal scale elimination

QPE

Quantitative Precipitation Estimation

QPF

quantitative precipitation forecast

QuikSCAT

Quick Scatterometer

QVP

quasi-vertical profile

R

R/V

research vessel

r^e

effective radius

RACM

regional atmospheric chemistry mechanism

RACORO

Routine AAF Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations

RAD

Radiation Measurements at AMF

RADAGAST

Radiative Divergence using AMF, GERB and AMMA Stations

RAM

random access memory or root-zone available moisture

RAMCES

Reseau atmospherique de mesure des composes a effet de serre

RAMIX

Radon Measurements of Atmospheric Mixing

RAMS

regional atmospheric modeling system

RAOB

radiosonde observation

RAOS

Reno Aerosol Optics Study

RAP

Rapid Refresh model (NCEP)

RAPRAD

rapid radiation transfer model

RASER

radio-frequency amplification by stimulated emission of radiation

RASS

radio acoustic sounding system

RAW

data file created by an instrument

RAWS

Remote Automated Weather Stations

RaXPol

Rapid X-band Polarimetric Radar

RBF

radial basis function

RBL

remote balloon launching

RCC

radiometer calibration and characterization

RCCL

Royal Caribbean Cruise Lines

RCE

radiative-convective equilibrium

RCF

radiometer calibration facility

RCS

remote cloud sensing

RCSA

revised convective stratiform anvil

RDG-FA

Rayleigh-Debye-Gans for Fractal-Aggregates theory

RDI

rotating drum impactor

RDP

Research and Development Project

REB

radiative energy budget

REBS

radiation energy balance system

RED

relative Euclidean distance

REDDIC

Retrieval of Entrainment and Droplet Density in Cumulus

REE

rainwater entire evaporation

REFIR-PAD

Radiation Explorer in the Far-Infrared-Prototype for Applications and Development

RegCM2

regional climate model, Version 2 (NCAR)

RELAMPAGO

Remote sensing of Electrification, Lightning, and Mesoscale/microscale Processes with Adaptive Ground Observations

REPA

retrieved effective particle absorption

REPS

retrieved effective particle size

RESET

Regional Service Team (TWP)

REx

VOCALS Regional Experiment

RF

radio frequency

RFA

radiative flux analysis

RFD

relative frequency distribution

RFE

radiative forcing efficiency

RFO

relative frequency of occurrence

RGA

reduction gas analyzer or Rayleigh-Gans approximation

RH

relative humidity

RHC

relatively highly reactive hydrocarbon

RHI

range-height indicator

RHR

radiative heating rate

RHUBC

Radiative Heating in Underexplored Bands Campaign

RHUBC-II

Radiative Heating in Underexplored Bands Campaign, Phase II

RI

refractive index

RICO

Rain in Cumulus over the Ocean

RIE

relative ionization efficiency

RIGC

Research Institute for Global Change (JAMSTEC)

RINEX

Receiver Independent Exchange Format

RIS

Ross Ice Shelf

RISC

Russian Ice Station Comparison

RISCAM

Routine In Situ Cloud and Aerosol Measurements

RK

residual kriging

RL

Raman lidar

RLWP

rain liquid water path

RMA

reduced-major-axis

RMBL

Rocky Mountain Biological Laboratory

RML

restricted maximum likelihood

RMM

real-time multivariate MJO

rms

root mean square

RMSE

root-mean-square error

RMW

radius of maximum wind

RNN

Recurrent Neural Network

RO

radio occultation

ROCS

Rocky Mountain Organic Carbon Study

ROI

radius of influence

ROM

rough order of magnitude or regional oxidant model

RoMBAS

Rocky Mountain Biogenic Aerosol Study

ROME

Radar Organization Metric

RONOCO

Role of Night-time chemistry in controlling the Oxidising Capacity Of the atmosphere (U.K. university project)

ROSR

remote ocean surface radiometer

RPA

remotely piloted aircraft

RPC

Representative Concentration Pathway

RPH

roll, pitch, and heave

RPV

remotely piloted vehicles

RR

rain rate

RRC

rainfall-rate criteria

RRFS

Rapid Refresh Forecast System

RRHO

rigid rotor-harmonic oscillator

RRM

regionally refined model

RRTM

rapid radiative transfer model

RRTMG

Rapid Radiative Transfer Model for Global Climate Models

RSD

relative standard deviation

RSM

Regional Spectral Model

RSMAS

Rosenstiel School of Marine and Atmospheric Science

RSMS

rapid single-particle mass spectrometer

RSP

research scanning polarimeter

RSS

rotating shadowband spectroradiometer

RT

radiative transfer

RTA

residence time analysis

RTD

resistive temperature device or resistance temperature detector

RTM

radiative transfer model

RTMA

Real-Time Mesoscale Analysis

RUC

rapid update cycle

RV

research vessel

RVS

Riverside, California

RWC

rain water content

RWP

radar wind profiler

RWS

Rossby wave source

RZSM

root-zone soil moisture

S

S-HIS

scanning high-resolution interferometer sounder

S-XRF

synchrotron-induced X-ray fluorescence spectrometry

S2D

seasonal to decadal

S2S

sub-seasonal to seasonal

SABL

scanning aerosol backscatter lidar

SABLE

Surface Atmospheric Boundary Layer Experiment

SABOR

Ship-Aircraft Bio-Optical Research

SAC

Site Advisory Committee

SACOL

Semi-Arid Climate and Environment Observatory of Lanzhou University

SACZ

southern Atlantic convergence zone

SAE

scattering Angstrom exponent

SAFIRE

Service des Avions Francais Instrumentés pour la Recherche en Environnement

SAGE

Stratospheric Aerosol and Gas Experiment or Sunlight Absorption on the Greenland Ice Sheet Experiment

SAIC

Science Application International Corporation

SAIL

Surface Atmosphere Integrated Field Laboratory

SAILS

Supplemental Adaptive Intravolume Low-Level Scan

SAL

supercontinuum absorption lidar or Saharan air layer

SALLJ

South American low-level jet

SAM

Sun and Aureole Measurement or System for Atmospheric Modeling or Southern Annular Mode

SAMD

Standardized Atmospheric Measurement Data

SAMEX

Storm and Mesoscale Ensemble Experiment or System for Atmospheric Modeling-Explicit Microphysics

SAMSON

Solar and Meteorological Surface Observational Network (NOAA)

SAO

Smithsonian Astrophysical Observatory

SAOD

stratospheric aerosol optical depth

SAON

Sustaining Arctic Observing Networks

SAPHIR

Sondeur Atmospherique du Profil d'Humidite Intertropicale par Radiometrie

SAPRC

Statewide Air Pollution Research Center (University of California)

SAR

synthetic aperture radar or search and rescue

SARA

Simplified Aerosol Retrieval Algorithm

SARB

Surface and Atmospheric Radiation Budget

SARGAN

in-Situ AeRosol GAW observing Network

SARS

Site Access Request System

SAS

sub-arctic summer or Simplified Arakawa-Schubert

SatCORPS

Satellite Cloud and Radiation Property retrieval System

SAV

surface-area-to-volume ratio

SAW

sub-arctic winter

SBCAPE

surface-based convective available potential energy

SBD

short-burst data

SBDART

Santa Barbara DISORT Atmospheric Radiative Transfer

SBIR

Small Business Innovation Research (grant)

SBJ

Sierra Barrier Jet

SBL

stable boundary layer

SBM

spectral bin microphysics

SBRO

Stony Brook University - Brookhaven National Laboratory Radar Observatory

SBUV

solar backscatter ultraviolet radiometer

Sc

stratocumulus

SCAI

Simple Cloud Aggregation Index

SCAM

Single-Column Atmosphere Model

SCAN

Soil Climate Analysis Network

SCAR-B

Smoke, Clouds, and Radiation-Brazil

ScaRaB

Scanner for Radiation Budget

SCCN

size-resolved cloud condensation nuclei

SCE

stochastic collection equation

SCF

stability correction function

SCIAMACHY

Scanning Imaging Absorption Spectrometer for Atmospheric Chartography

SciDAC

Scientific Discovery through Advanced Computing (DOE)

SCLW

supercooled liquid water

SCM

single-column model

SCMS

Small Cumulus Microphysics Study

SCNNLS

smoothness constrained non-negative least squares

SCOPE

San Clemente Ocean Probing Experiment

SCOPS

Subgrid Cloud Overlap Profile Sampler

SCOW

Scatterometer Climatology of Ocean Winds

SCREAM

Simple Cloud-Resolving E3SM Atmosphere Model

SCSI

small computer system interface

SCSMEX

South China Sea Monsoon Experiment

SCT

stratocumulus-to-cumulus transition

SD

saturation departure

SDIRK

Singly Diagonally Implicit Runge-Kutta method

SDM

superdroplet method

SDS

site data system

SDSS

self-deploying surface sensor

SEAC4RS

Studies of Emissions and Atmospheric Composition, Clouds, and Climate Coupling by Regional Surveys

SEARCH

Study of Environmental Arctic Change, Southeastern Aerosol Research and Characterization

SEB

surface energy budget

SEBEX

Sahelian Energy Balance Experiment

SEBN

Surface Energy Balance Network (NOAA ARL)

SEBS

Surface Energy Balance System

SEC

South Equatorial Current

SECC

South Equatorial Countercurrent

SEM

scanning electron microscopy

SERRS

surface-enhanced resonance Raman spectroscopy

SERS

surface-enhanced Raman spectroscopy

SESI

Science and Engineering Services, Inc.

SEVIRI

Spinning Enhanced Visible and InfraRed Imager

SFMR

stepped frequency microwave radiometer

SGI

Standardized Groundwater Index

SGMM

self-generating master mechanism

SGP

Southern Great Plains

SGS

subgrid-scale

SHADOZ

Southern Hemisphere Additional Ozonesondes network

SHARPpy

Sounding/Hodograph Analysis and Research Program in Python

SHAVE

Severe Hazard Analysis and Verification Experiment

SHAWMS

Soil Heat And Water Measurement System

ShCu

shallow cumulus

SHDOM

Spherical Harmonic Discrete Ordinate Method

SHEBA

Surface Heat Budget of the Arctic Ocean (Subprogram of NSF ARCSS Oil)

SHF

sensible heat flux

SHIMS

Shortwave Hemispheric Irradiance Measurement System

SHIPPO

Shipborne Pole to Pole Observation

SHOC

simplified higher-order closure

SiB

Simple Biosphere Model

SiBCASA

simple biosphere Carnegie-Ames-Stanford Approach

SIBYL

Selective Iterated Boundary Location scheme

SIC

sea ice concentration

SICIMS

selected ion chemical ionization mass spectrometer

SIE

sea ice extent

SIMD

single instruction multiple data

SIMPLE

Semi-Implicit Method for Pressure Linked Equations

SIMS

secondary ion mass spectrometry

SINT

solar-infrared near-infrared technique

SIP

secondary ice production

SIPAM

System for the Protection of Amazonia

SIPEXII

Sea Ice P:hysics EXperiment

SIROS

solar and infrared observing system

SIRS

solar infrared radiation station

SIRTA

Site Instrumental de Recherche par Teled'etrection Armospherique

SISC

Science and Infrastructure Steering Committee

SISR

single-image super resolution

SIST

solar-infrared split-window technique

SITAC

Spectral Imagery Technology Applications Center

SKYRAD

sky radiometers on stand for downwelling radiation

SL

stable precipitation over land

SL3D

storm labeling n three dimensions

SLAM

Simple Land-Atmosphere Model

SLC

single-layer cloud

SLCF

short-lived climate forcer

SLCP

short-lived climate pollutants

SLP

sea level pressure

SLR

scanning Raman lidar

SLSTR

Sea and Land Surface Temperature Radiometer

SLWC

supercooled liquid water content

SM

soil moisture

SM-EF

soil moisture-evaporative fraction

SM-P

soil moisture-precipitation

SMACS

Smart Aerosonde Clusters

SMAP

Soil Moisture Active Passive mission (NASA)

SMART-HELIOS

Spectral Modular Airborne Radiation Measurement System--Helicopter-Borne Observations

SMART-R

Shared Mobile Atmospheric Research and Teaching Radar

SMB

surface mass balance

SMC

stratiform mixed-phase cloud

SMCS

separated MCS

SMEAR

Station for Measuring Ecosystem-Atmosphere Relations (Finland)

SMET

Surface Meteorological Instruments for TWP

SMHI

Swedish Meteorological and Hydrological Institute

SMILES

simplified molecular-input line-entry system

SML

surface microlayer

SMM

soil moisture memory

SMMR

scanning multichannel microwave radiometer

SMOKE

Sparse Matrix Kernel Emissions model

SMOPS

Soil Moisture Operations Products System

SMOS

Surface Meteorological Observing Station or Soil Moisture and Ocean Salinity

SMOSMANIA

Soil Moisture Observing System-Meteorological Automatic Network Integrated Application

SMPS

scanning mobility particle sizer

SNACS

Studies of the Northern Alaskan Coastal System

SNEX

Snowfall Experiment (BAECC)

SNICAR

Snow, Ice and Aerosol Radiation model

SNL

Sandia National Laboratories

SNOTEL

Snowpack Telemetry

SNPP

Suomi National Polar-Orbiting Partnership

SNR

signal-to-noise ratio

SNT

severe nontornadic storm

SOA

secondary organic aerosol

SOAFFEE

Secondary Organic Aerosol From Forest Emissions Experiment

SOAG

semivolatile organic gas-phase species

SOAP

Surface Ocean Aerosol Production

SOAS

Southern Oxidant and Aerosol Study

SoCAB

Southern California Air Basin

SOCCR

State of the Carbon Cycle Report

SOCEX1

Southern Ocean Cloud Experiment

SOCRATES

Suite of Community RAdiative Transfer Codes based on Edwards and Slingo or Southern Ocean Clouds Radiation Aerosol Transport Experimental Study

SOFEX

Southern Ocean Iron Experiment

SOFIA

Surface of the Ocean, Fluxes, and Interactions with the Atmosphere

SOI

Southern Oscillation Index

SOL

site operations log *Now known as metadata system (MDS)

SOM

slab ocean model or self-organizing map or Statistical Oxidation Model

SOP

special observing period

SOPAC

South Pacific Applied Geoscience Commission

SORCE

Solar Radiation and Climate Experiment

SORGAM

Secondary Organic Aerosol Model

SORTI

solar radiance transmittance interferometer

SOS

Southern Oxidants Study

SOW

statement of work

SP-AMS

Soot Particle--Aerosol Mass Spectrometer

SP2

single-particle soot photometer

SP2-XR

single-particle soot photometer -- extended range

SPA

Storm-penetrating aircraft

SPADE

Separate Physics and Dynamics Experiment or Stratospheric Photochemistry, Aerosols, and Dynamics Experiment

SPAR

Saccadic Phased Array Radar Sampling

SPARC

Space Science and Engineering Center Portable Atmospheric Research Center or Stratosphere-Troposphere Processes and Their Role in Climate

SPARTACUS

SPeedy Algorithm for Radiative TrAnsfer through CloUd Sides

SPARTAN

Surface PARTiculate mAtter Network

SPARTICUS

Small Particles in Cirrus

SPC

Storm Prediction Center (NOAA)

SPCZ

South Pacific convergence zone

SPECTRE

Spectral Radiance Experiment

SPEI

Standardized Precipitation Evapotranspiration Index

SPI

Standardized Precipitation Index or Swiss Polar Institute

SPICE

Solid Precipitation Intercomparison Experiment (WMO)

SPIE

Society of Photo-optic Instrumentation Engineers

SPIN

Spectrometer for Ice Nucleation

SPL

Storm Peak Laboratory

SPLAT

single-particle laser ablation time-of-flight mass spectrometer

SPLAT-II

second-generation single-particle laser ablation time-of-flight mass spectrometer

SPM

site program manager

SPN

sunshine pyranometer

SPPT

Stochastically Perturbed Parametrization Tendencies

SPREP

South Pacific Regional Environmental Program

SPRGN

South Pacific Regional GPS Network

SQI

signal quality index

SR-XRF

synchrotron radiation-induced X-ray fluorescence spectrometry

SRB

surface radiation budget

SRDB

solar radiation dry bias

SRH

storm relative helicity

SRI

Standardized Runoff Index

SRL

scanning raman lidar

SRM

solar radiation modification

SRRB

Surface Radiation Research Branch (NOAA)

SRRL

Solar Radiation Research Laboratory (NREL)

SRTM

Shuttle Radar Topography Mission

SRW

Short Range Weather

SS

supersaturation

SSA

single-scattering albedo or sea spray aerosol

SSCL

suppressed shallow cloud regime

SSD

snowflake size distribution

SSEC

Space Science and Engineering Center

SSFR

solar spectral flux radiometer

SSHF

surface sensible heat flux

SSI

spectral solar irradiance or Standardized Streamflow Index

SSiB

Simplified Simple Biosphere Model

SSiB

simplified Simple Biosphere Model

SSIM

structural similarity index

SSM/I

special sensor microwave/imager

SSMI

Standardized Soil Moisture Index or Special Sensor Microwave Imager

SSMIS

special sensor microwave imager sounder

SSNT

significant severe nontornadic storm

SSP

scanning spectral polarimeter or sea spray particles or Shared Socioeconomic Pathway

SSPA

solid-state power amplifier

SSPM

stretched scattering potential method

SSRGA

self-similar Rayleigh-Gans approximation

SSRL

Solar Radiation Research Laboratory (NREL)

SSS

sea surface salinity

SSST

sea surface (skin) temperature

SST

sea-surface temperature

SSURGO

Soil Survey Geographic (database)

SSW

Sudden Stratospheric Warning

StaBLE

Stable Boundary Layer Education

STAC

size-to-area conversion or size and time-resolved aerosol collector

STAP

single-channel tricolor absorption photometer

START08

Stratosphere-Troposphere Analyses of Regional Transport 2008

STE

stratosphere-troposphere exchange

STEC

Science Team Executive Committee

STEM

Sulfur Transport Eulerian Model or scanning transmission electron microscopy

STEPS

Severe Thunderstorm Electrification and Precipitation Study

STI

simple tillage index

STILT

Stochastic Time-Inverted Lagrangian Transport

STIRPAT

STochastic Impacts by Regression on Population, Affluence, and Technology

STORM-FEST

Stormscale Operational Research and Meteorology Fronts Experiment Systems Test

STORMVEX

Storm Peak Lab Cloud Property Validation Experiment

STP

standard temperature and pressure

STRAT

Stratospheric Tracers of Atmospheric Transport

STXM/NEXAFS

scanning transmission X-ray microscopy with near edge X-ray absorption fine structure spectroscopy

SUCCESS

Subsonic Aircraft Contrail and Cloud Effects Special Study

SUNY

State University of New York

SUPG

streamline upwind Petrov Galerkin method

SURFRAD

Surface Radiation Budget Network

SURTHREF

Surface Temperature and Humidity Reference System for Sondes

SUSMAP

Science Utilization of SMAP (NASA)

SV-OOA

semi-volatile oxygenated organic aerosol

SV-TAG

semi-volatile thermal desorption aerosol gas chromatograph

SVC

subvisible cirrus

SVD

singular value decomposition

SVI

snowflake video imager

SVOC

semi-volatile organic compound

SVOOA

semi-volatile oxygenated organic aerosol

SW

shortwave

SWACR

Scanning W-band ARM Cloud Radar

SWATS

soil water and temperature system

SWC

snow water content

SWCF

shortwave cloud forcing

SWDI

severe weather data inventory (NCEI)

SWDN

surface shortwave downward radiation

SWE

snow water equivalent

SWERUS-C3

Swedish-Rssian-U.S. Arctic Ocean Investigation of Climate-Cryosphere-Carbon Interactions

SWI

soil wetness index

SWIR

shortwave infrared

SWR

shortwave radiation

SWS

shortwave spectroradiometer

SWUP

surface upward shortwave radiation

SWV

slant water vapor

SZA

solar zenith angle

T

TAB

total attenuated backscattering

TACTIC

Tropospheric Aerosols for Climate in CNRM-CM

TAFTS

tropospheric airborne Fourier transform spectrometer

TAMS

Tracking Algorithm for Mesoscale Convective Systems

TAMU

Texas A&M University

TANSO-FTS

Thermal and Near infrared Sensor for Carbon Observation Fourier Transform Spectrometer

TAO

Tropical Atmosphere Ocean

TAO/TRITON

Tropical Atmosphere Ocean/Triangle Trans-Ocean Buoy Network

TAOS

two-dimensional angular optical scattering

TAP

tropospheric aerosol particle

TAR

Tape ARchive

TARFOX

Tropospheric Aerosol Radiative Forcing Observational Experiment (1996)

TAS

true air speed

TAV

Tropical Atlantic Variability

TB

tar balls

TBI

tethered balloon system impactor

TBM

terrestrial biogeochemical model or terrestrial biosphere model

TBRG

tipping bucket rain gauge

TBS

tethered balloon system

TC

tropical cyclone

TC-RSR

thin-cloud rotating shadowband radiometer

TC4

Tropical Composition, Cloud and Climate Coupling

TCAP

Two-Column Aerosol Project

TCC

total cloud cover

TCCON

Total Carbon Column Observing Network

TCEQ

Texas Commission on Environmental Quality

TCIP

Transit Communications Interface Profiles

TCPIC

Trades Cumuli Precipitation Initiation and Characterization

TCR

transient climate response

TCWV

total column water vapor

TD

thermodenuder or thermal desorption

TD-LIF

thermal dissocation laser-induced fluorescence

TDCIMS

thermal desorption chemical ionization mass spectrometer

TDDR

total direct diffuse radiometer

TDL

Tactical Data Link or tunable-diode laser

TDLAS

tunable diode laser absorption spectrometer

TDMA

time division multiple access (from ARM acronym list); also tandem differential mobility analyzer

TDPBMS

thermal desorption particle beam mass spectrometer

TDS

tornadic debris signature

TDWR

terminal Doppler weather radar (FAA)

TEA

transverse-excited atmospheric pressure

TEC

thermoelectric cooler

TEJ

tropical easterly jet

TEM

transmission electron microscope or trajectory ensemble model

TEM/EELS

transmission electron microscopy/electron energy loss spectroscopy

TERENO

Terrestrial Environmental Observatories

TERN

Terrestrial Ecosystem Research Network

TERS

tip-enhanced Raman spectroscopy

TES

tropospheric emission spectrometer or thermal emission sounder or Terrestrial Ecosystem Science

TexAQS

Texas Air Quality Study

THF

turbulent heat flux

THOR

Thickness from Offbeam Returns

THORPEX

The Observing System Research and Predictability Experiment

THWAPS

temperature, humidity, winds, and pressure system

TI

transverse ionization

TIBL

thermal internal boundary layer

TIC

total ion count

TICFIRE

Thin Ice Clouds in Far IR Experiment

TILDAS

Tunable Infrared Laser Differential Absorption Spectrometer

TIMEX

Thunderstorm Initiation Mobile Experiment

TIPA

tilted independent pixel approximation

TIR

thermal infrared

TIROS

television and infrared observation satellite

TITAN

Thunderstorm Identification, Tracking, Analysis, and Nowcasting

TIWE

Tropical Instability Wave Experiment

TKE

turbulent kinetic energy

TM

thematic mapper

TMI

Tropical Rainfall Measurement Mission (TRMM) Microwave Imager

TMPA

TRMM Multi-satellite Precipitation Analysis

TOA

top of the atmosphere

TOAR

Tropospheric Ozone Assessment Report

tobac

Tracking and Object-Based Analysis of Clouds

TOC

total organic carbon

TOCS

Tropical Ocean Climate Study

TOGA

trace organic gas analyzer

TOGA-COARE

Tropical Ocean Global Atmosphere-Coupled Ocean Atmosphere Response Experiment

TOMAS

TwO Moment Aerosol Sectional model

TOMS

total ozone mapping experiment spectrometer

TOPAZ

tunable ozone profiler for aerosol and ozone

TOPSE

Tropospheric Ozone Production by the Spring Equinox experiment

TOR

thermal/optical reflectance

TOVS

TIROS operational vertical sounder

TP

temperature profiling

TPD-DART-HRMS

temperature-programmed desorption-direct analysis in real-time, high-resolution mass spectrometry

TPPN

Trans-Pacific Profiler Network

TPS

total precipitation sensor

TPW

total precipitable water

TRAC

time-resolved aerosol collector

TRACE-A

Transport and Atmospheric Chemistry near the Equator-Atlantic

TRACE-P

Transport and Chemical Evolution over the Pacific campaign (NASA)

TRACER

Tracking Aerosol Convection Interactions Experiment

TRACER - ACE

Tracking Aerosol Convection Interactions Experiment - Aerosol Characterization Experiment

TRACER - CAT

Tracking Aerosol Convection Interactions Experiment - Carbonaceous Aerosol Thrust

TRACER - MAP

Tracking Aerosol Convection Interactions Experiment - Mapping Aerosol across Houston

TRACER-UFI

Tracking Aerosol Convection Interactions Experiment - Ultrafine aerosol Formation & Impacts

TRI

Toxic Release Inventory (U.S. EPA)

TRL

technology readiness level

TRMM

Tropical Rainfall Measuring Mission

TRMM-KWAJEX

Tropical Rainfall Measuring Mission-Kwajalein Experiment

TRMM-LBA

Tropical Rainfall Measuring Mission Large-Scale Biosphere-Atmosphere Experiment in Amazonia

TROA

time-resolved optoacoustic (cell)

TROPOMI

Tropospheric Monitoring Instrument

TRRL

temperature rotational Raman lidar

TSBR

total solar broadband radiometer

TSI

total sky imager or total solar irradiance

TSP

total suspended particles

TTL

tropical tropopause layer

TUTT

tropical upper tropospheric trough

TUVR

total ultraviolet radiometer

TVC

total volume coverage

TVS

tornadic vortex signature

TWC

total water content or total water cloud

TWH

tropical western hemisphere

TWP

Tropical Western Pacific

TWP-ICE

Tropical Warm Pool International Cloud Experiment

TWST

three-waveband spectrally agile technique

TWT

traveling wave tubes

TWTA

Traveling Wave Tube Amplifier

U

UAS

uncrewed aerial system (preferred) or unmanned aerial system

UAV

uncrewed aerial vehicle (preferred) or unmanned aerial vehicle

UAV-AERI

miniaturized version of the ground-based AERI

UCAR

University Corporation for Atmospheric Research

UCLA

University of California, Los Angeles

UCM

Urban Canopy Model

UCSD

University of California, San Diego

UDF

UAV demonstration flights

UEA

Universidade do Estado do Amazonia

UFP

ultrafine particles

UFS

Unified Forecast System

UFT

ultrafast thermometer

UHI

urban heat island

UHMA

University of Helsinki Multicomponent Aerosol model

UHSAS

ultra-high-sensitivity aerosol spectrometer

UIC

Ukpeagvik Iñupiat Corporation

UIF

UAV interim flight

UIR

upwelling infrared radiometer

UMBC

University of Maryland, Baltimore County

UMR

unit mass resolution

UNAVCO

University NAVSTAR Consortium

UNESCO

United Nations Education, Scientific, and Cultural Organization

UNFCCC

United Nations Framework Convention on Climate Change

UNICON

unified convective scheme

UNIFAC

universal functional group activity coefficient

UPS

uninterruptable power supply

URIP

University Research Instrumentation Program

URL

Uniform Resource Locator

USAF

United States Air Force

USAP

United States Antarctic Program

USB

Universal Serial Bus

USCG

United States Coast Guard

USCRN

U.S. Climate Reference Network

USDA

U.S. Department of Agriculture

USGCRP

U.S. Global Change Research Program

USGEWEX

United States Global Energy and Water Exchanges

USGS

U.S. Geological Survey

USN

U.S. Navy

USP

Universidade de Sao Paulo

USR

upwelling solar radiation

UT

upper troposphere

UTH

upper tropospheric humidity

UV

ultraviolet

UV-APS

ultraviolet aerodynamic particle sizer

UVB

ultraviolet B

UVRL

ultraviolet Raman lidar

UVSR

ultraviolet spectral radiometer

UW-SSEC

University of Wisconsin Space Science and Engineering Center

UWIREMIS

University of Wisconsin Global Infrared Land Surface Emissivity

UWLCM

University of Warsaw Lagrangian Cloud Model

V

VACES

versatile aerosol concentration enrichment system

VAD

velocity-azimuth display

VAMOS

Variability of the American Monsoon System

VAP

value-added product

VarBC

variational bias correction

VBS

volatility basis set

VCEIL

Vaisala ceilometer

VCP

volume coverage pattern

VCSEL

vertical cavity surface emitting laser

VD

Doppler velocity

VDA

variational data assimilation

VDM

vegetation demographic model

VED

volume equivalent diameter

VESRI

Virtual Earth System Research Institute

VFR

volume fraction remaining or visual flight rules

VGA

video graphics array

VIF

variance inflation factor

VIIRS

Visible Infrared Imaging Radiometer Suite

VIMF

vertically integrated moisture flux

VIP

video integrator processor

VIPS

video ice particle sampler

VIRS

visible infrared scanning radiometer

VIS

visible or visible satellite imagery

VISST

visible infrared solar-infrared split-window technique

VLBI

very-long-baseline interferometry

VLF

very low frequency

VMR

volume mixing ratio

VNIR

visible/near infrared

VOAG

vibrating orifice aerosol generation

VOC

volatile organic carbon or volatile organic compound

VOCALS

VAMOS Ocean-Cloud-Atmosphere-Land Study

VOCALS-REX

Variability of the American Monsoon System (VAMOS) Ocean-Cloud-Atmosphere-Land Study Regional Experiment

VOCAR

variation of coastal atmospheric refractivity

VORTEX-SE

Verification of the Origins of Rotation in Tornadoes Experiment-Southeast

VOS/XBT

Voluntary Observing System Expendable Bathythermograph

VPD

vapor pressure deficit

VPN

virtual private network

VPR

vertically pointing radar

VR

variable-resolution

VSMOW

Vienna Standard Mean Ocean Water

VSWIR

visble to shortwave infrared

VTLC

video time-lapsed camera

VTMX

Vertical Transport and Mixing Experiment

VUV

vacuum ultraviolet

VV

vertical velocity

VWD

vector wind difference

VWS

vertical wind shear

VZA

viewing zenith angle

W

WACCEM

Water Cycle and Climate Extremes Modeling

WACCM

Whole Atmosphere Community Climate Model

WACR

W-band ARM Cloud Radar

WAIS

West Antarctic Ice Sheet

WAS

whole air sampling

WBF

Wegener-Bergeron-Findeisen process

WBRG

weighing bucket rain gauge

WCB

warm conveyor belt

WCCAP

World Calibration Centre for Aerosol Physics (GAW)

WCL

Wyoming cloud lidar

WCM

water content monitor

WCPC

water-based condensation particle counter

WCR

Wyoming cloud radar

WCRP

World Climate Research Programme

WCT

wavelet covariance transform

WDCA

World Data Center for Aerosols

WDCGG

World Data Centre for Greenhouse Gases

WDSS-II

Warning Decision Support System-Integrated Information

WETCHIMP

Wetland and Wetland CH4 Inter-comparison of Models Project

WFOV

wide field of view

WGNE

Working Group on Numerical Experimentation

WHOI

Woods Hole Oceanographic Institution

WHP

WOCE Hydrographic Program

WIBS

wide issue bioaerosol spectrometer or wideband integrated bioaerosol sensor

WIOC

water-insoluble organic carbon

WIS

Weather Information System (WMO)

WISG

World Infrared Standard Group

WISHE

wind-induced surface heat exchange

WISP

Winter Icing and Storms Project (NOAA)

WISPAR

Winter Storms and Pacific Atmospheric Rivers

WISPER

Water Isotope System for Precipitation and Entrainment Research

WiWB

Wiener water balance

WMO

World Meteorological Organization

WOCE

World Ocean Circulation Experiment

WOOM

Wave One Ozone Maximum

WOUDC

World Ozone and Ultraviolet Radiation Data Centre

WP

warm pool

WPDN

wind-profiler demonstration network

WPL

Wave Propagation Laboratory

WRAS

wide-range aerosol spectrometer

WRC

World Radiation Center

WRDC

World Radiation Data Centre

WRF

Weather Research and Forecasting (Model)

WRF-Chem

chemistry version of the Weather Research and Forecasting model

WRF-SFIRE

Weather Research and Forecasting fire-spread model

WRF-STILT

Weather Research and Forecasting-Stochastic Time-Inverted Lagrangian Transport

WRMC

World Radiation Monitoring Center

WRR

World Radiometric Reference

WSFO

Weather Service Forecast Office

WSG

World Standard Group

WSI

whole sky imager

WSOC

water-soluble organic compound

WSR-88D

weather surveillance radar-88 Dopplers

WSRA

wide-swath radar altimeter

WTG

weak temperature gradient

WUS-D3

Western United States Dynamically Downscaled Dataset

WV

water vapor

WVDIAL

water vapor differential absorption lidar

WVM

water vapor mass

WVMR

water vapor mixing ratio

WVP

water vapor profiling or water vapor path

WVR

water vapor radiometer

WWLLN

World Wide Lightning Location Network

WWMCA

World-Wide Merged Cloud Analysis (USAF)

WWRP (WMO)

World Weather Research Programme

WWW

World Weather Watch

X

X-SAPR

X-Band Scanning ARM Precipitation Radar

XANES

X-ray Absorption Near Edge Structure spectroscopy

XBT

expendable bathythermograph

XDC

External Data Center (ARM)

XEDS

X-ray energy dispersive spectroscopy

XPIA

Experimental Measurement Campaign: Planetary boundary layer Instrumentation Assessment

XPS

X-ray photoelectron spectroscopy

Y

YES

Yankee Environmental Systems

YIBs

Yale Interactive Terrestrial Biosphere model

YOPP

Year of Polar Prediction

YOTC

Year of Tropical Convection

YRD

Yangtze River Delta

Z

ZHD

zenith hydrostatic delay

ZPW

Zero Power Warming experiment

ZSS

Zvenigorod Scientific Station

ZTD

zenith total delay

ZWD

zenith wet delay