Jim Mather, who is retiring this summer after three decades with ARM, reflects on his life and career.

Atmospheric scientist Larry Berg will guide ARM into the next era of scientific observations and succeed Jim Mather, who has led ARM since 2007.

New storage, software, and computing frameworks set the stage for next-generation data tools and research support.

A new version of continuous large-scale forcing data for the 2023–2024 Eastern Pacific Cloud Aerosol Precipitation Experiment (EPCAPE) is now available from ARM.

This constrained variational analysis (VARANAL) value-added product includes both the large-scale forcing terms and the evaluation fields, which can be used for driving a variety of models and validating simulations.

ARM has developed the Three-Channel Sunphotometer Cloud Mode (SPHOTCOD) value-added product to provide information on cloud properties for process studies.

Marine shallow cumulus clouds cool the Earth by reflecting solar radiation back to space and are challenging to accurately represent in earth system models. These clouds are intimately coupled with turbulence in the boundary layer. Here, vertical air motion and its co-variability with cumulus cloudiness are characterized using data from the Atmospheric Radiation Measurement (ARM) Eastern North Atlantic (ENA) observatory.

Stratocumulus clouds cover a large fraction of Earth’s surface and strongly influence regional weather and the global energy balance. Entrainment, the mixing process at the top of the stratocumulus-topped boundary layer, strongly influences cloud lifetime, precipitation, and radiative properties. Despite its importance, entrainment remains poorly understood, largely due to the difficulty in observing fine-scale structures near the cloud top, which can be only meters thick. We therefore propose a laboratory facility with controllable conditions and the use of numerical simulations to demonstrate how cloud-top entrainment can be studied experimentally.

The Aerosol-Cloud-Drizzle Convection Chamber (ACDC2) collaboration has developed a comprehensive concept and modeling hierarchy for a convection-cloud chamber facility designed to investigate the chain of events from aerosol activation to cloud droplet growth and drizzle formation within turbulent clouds. The proposed 9-meter-tall chamber enables steady-state turbulence and microphysical conditions, facilitating continuous direct observation of cloud and aerosol properties.