AERI Noise Filtered Data Available for 3 Current ARM Deployments

Published: 4 June 2025

This AERINF quicklook image shows the time series of the radiance in window channels for AERI Channel 1 (900 cm-1) and Channel 2 (2600 cm-1) on May 23, 2024, during the CAPE-k field campaign. Image is from Krista Gaustad, Pacific Northwest National Laboratory.

The Atmospheric Radiation Measurement (ARM) User Facility has released its Atmospheric Emitted Radiance Interferometer (AERI) Noise Filtered value-added product (AERINF VAP) for three ongoing ARM Mobile Facility deployments:

the Bankhead National Forest (BNF) atmospheric observatory in northern Alabama
the Coast-Urban-Rural Atmospheric Gradient Experiment (CoURAGE) in Baltimore, Maryland
the Cloud And Precipitation Experiment at kennaook (CAPE-k) in northwestern Tasmania.

The ARM AERI collects a sky spectrum every 20 seconds, but the high temporal resolution results in a large random noise in the sky spectra. AERINF uses the high correlation in the observed radiance across the spectrum to reduce the uncorrelated random error in the data using principal component analysis. The VAP automatically determines the appropriate number of principal components to use in the reconstruction to eliminate as much random noise as possible.

More information about AERINF can be found on the VAP web page.

Scientists can now use the BNF, CoURAGE, and CAPE-k AERINF data, which are in netCDF format. Additional data are being processed for each deployment as AERI input data become available, with a lag of about 24 days.

Access the AERINF data in the ARM Data Center. (To download the data, first create an ARM account.)

Please send feedback on the data format and quality to ARM translator Damao Zhang.

To cite the AERINF data, please use doi:10.5439/1027272 for aerich1nf1turn.c1 (Channel 1 datastream) and doi:10.5439/1027273 for aerich2nf1turn.c1 (Channel 2 datastream).

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ARM is a DOE Office of Science user facility operated by nine DOE national laboratories.