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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Madden–Julian Oscillation Heating: to Tilt or Not to Tilt

Apr 10, 2014 Funded By: ASR

It is hypothesized that specific cloud populations at different stages are essential to the initiation and maintenance of the Madden-Julian Oscillation (MJO). In particular, the occurrence of shallow convection that then transitions to mid-level convection before the active phase of the MJO is thought to provide lower-level heating that then promotes large-scale moisture convergence necessary [...]

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Observational Analysis of Land-Atmosphere Coupling for Climate Model Evaluation

Apr 08, 2014 Funded By: ARM ASR

The state of the land can influence surface energy and moisture fluxes, boundary-layer clouds, and regional convection and precipitation, especially in summer when it couples more intensely with the atmosphere. Therefore, investigations of the cloud life cycle over continents therefore need to consider the role played by land-atmosphere interactions. Coarse-resolution global climate models tend to simulate [...]

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Multi-scale Variations of Decade-long Cloud Fractions from Six Different Platforms over the SGP

Mar 31, 2014 Funded By: ARM ASR

For decades, researchers have intensively studied observationally based cloud fraction estimates to better understand current climate change and predict future climate variability. In this study, observationally based cloud fraction estimates from six different platforms (three ground-based estimates and three satellite-based estimates) are compared.

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Retrieving Thermodynamic Profiles in the Boundary Layer in Clear and Cloudy Conditions

Mar 22, 2014 Funded By: ARM ASR

The thermodynamic structure of the atmospheric boundary layer (BL; the lowest 1-3 km of the atmosphere) rapidly changes due to a wide range of processes, and many studies require accurate profiles of temperature and water vapor at high time-resolution in order to understand the processes at work in the BL. These profiles can be derived [...]

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Understanding the Differences Between Absolution Calibration Techniques in the Microwave

Mar 22, 2014 Funded By: ARM ASR

Microwave radiometers (MWRs) typically measure downwelling radiation between 22 and 60 GHz. The most common geophysical variable derived from these observations are liquid water path and precipitable water vapor. However, if the MWR measures radiation at several frequencies along the 22.2 GHz water vapor line (e.g., from 22.2 to 25.0 GHz) and also several frequencies [...]

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