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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Sensitivity of Arctic Mixed-Phase Stratocumulus to Surface-Layer and Cloud-Top Moisture Sources

Jan 09, 2015 Funded By: ARM ASR

Arctic mixed-phase stratocumulus cloud systems (AMPS) play an important role in determining the structure of the Arctic atmospheric boundary layer and magnitudes of surface energy budget terms, due to the presence of radiatively important supercooled cloud liquid water. AMPS occur in significantly different environments than subtropical stratocumuli. For example, AMPS are observed above both stable [...]

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A Comprehensive Parameterization of Heterogeneous Ice Nucleation of Dust Surrogate

Dec 30, 2014 Funded By: ARM ASR

Reducing uncertainty in predicting climate change requires understanding ice clouds. At supercooled temperatures, many kinds of airborne aerosol particles can promote ice nucleation. In this paper, researchers, including scientists at DOE’s Pacific Northwest National Laboratory, developed and tested a new heterogeneous ice nucleation parameterization that covers a wide temperature range.

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Water Vapor Turbulence Statistics in the Convective Boundary Layer

Dec 09, 2014 Funded By: ARM ASR

Turbulence is a process that redistributes water vapor and other atmospheric gases, sensible heat, and momentum in the atmosphere. It is a stochastic process, and is best represented by statistics of various moments. It has been shown that the Atmospheric Radiation Measurement (ARM) Raman lidar has the accuracy and noise level to measure the second- [...]

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Validating Water Vapor Turbulence Measurements from Lidar

Dec 08, 2014 Funded By: ARM ASR

Turbulence in the convective boundary layer is important for redistributing water vapor and other atmospheric gases, sensible heat, and momentum. Turbulent mixing works over a wide range of scales from kilometers down to millimeters. The horizontal and vertical resolutions of most atmospheric models, such as general circulation and cloud resolving models, are too coarse to [...]

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Hail Generation and Melting in Deep Convective Clouds from the Perspective of Dual-polarization

Dec 02, 2014 Funded By: ARM ASR

Large hail is generated in vigorous convective updrafts which are commonly associated with columnar regions of enhanced differential reflectivity (ZDR columns) often capped with the depression of the cross-correlation coefficient ρhv measured by dual-polarization radars. After hailstones fall below the freezing level, they melt and produce large raindrops making a hail/rain mixture, which is characterized [...]

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