Research Highlights

Members of ARM's science team are major contributors to radiation and cloud research. ARM investigators publish about 150 refereed journal articles per year, and ARM data are used in many studies published by other scientific organizations. These documented research efforts represent tangible evidence of ARM's contribution to advances in almost all areas of atmospheric radiation and cloud research. Below is a selection of summaries highlighting recently-published ARM research. The entire collection of ARM Research Highlights can be accessed using the sorting buttons at right.

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Looking at Clouds from Both Sides Now

Jan 25, 2017 Funded By: ARM

The impact of clouds on the reflection of sunlight to space depends on two key properties: cloud optical depth and droplet effective radius. Satellites provide nearly global coverage of these cloud properties, but the accuracy of the retrievals has not been evaluated. This study used ground-based retrievals to evaluate the satellite retrievals, and found good [...]

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To Evaporate or Not to Evaporate: the Question of Secondary Organic Particulate Matter Lability

Jan 07, 2017 Funded By: ASR

New research highlights a nonlabile-to-labile transition for material representative of anthropogenic secondary organic particulate matter at a threshold humidity range. This behavior differs markedly from materials representing biogenic aerosol sources, which lack such a transition.

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Less Is More: Low Aerosol Concentrations Produce High Variability in Cloud Droplet Sizes

Jan 07, 2017 Funded By: ASR

Clouds form when water vapor in the atmosphere condenses around airborne particles, or aerosols, but the exact details of the process remain relatively unknown. Researchers used large-eddy simulations (LES) to model cloud droplets that formed in Michigan Technological University’s cloud chamber by injecting various amounts of aerosols. They found that high concentrations of aerosols decreased [...]

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Daily Cycle of Cloudiness over Maritime Continent Disrupt the Madden-Julian Oscillation

Jan 06, 2017 Funded By: ARM ASR

Every month or two, a large complex of clouds forms over the Indian Ocean and moves eastward, a pattern known as the Madden-Julian Oscillation (MJO). The MJO exhibits hard-to-predict behaviors, often weakening, as it moves across the Maritime Continent (MC; Indonesia-Malaysia and New Guinea)—so-called because of its combination of shallow seas and scattered land masses. [...]

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Reconciling Aerosol Optical Thickness and Surface Particle Mass Through Aerosol Liquid Water

Dec 27, 2016 Funded By: ASR

Scientists have long debated the cause of an anomalous pattern over the Southeast United States, where the satellite-measured summertime aerosol optical depth is greatly enhanced over its wintertime values. Ground-based measurements of aerosol mass and chemical composition, however, are inconsistent with these space-based observations.

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