Research Highlights

Highlights will be written for high-level accomplishments and published journal articles of ASR research. Each PI should submit one highlight per fiscal year. To send in a research highlight, please use the submittal form.

The Role of Radiative Heating in the MJO
Aug 07, 2017       
Despite its broad impacts on global weather and climate, the Madden-Julian Oscillation (MJO), which dominates tropical intra-seasonal variability, remains poorly represented in many weather forecasts and global climate model simulations. To improve our understanding of key processes of MJO initiation and propagation, this study, resulting from an ASR grant, uses observational data sets collected during [...]

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Ice Formation in Stratiform Mixed-phase Clouds at Warm Temperatures
Jul 19, 2017       
Low-level stratiform clouds have a high occurrence in polar regions. Accurate cloud thermodynamic phase determination is required to perform cloud property retrievals and to study aerosol-cloud interactions with remote-sensing measurements. However, ice particle formation in slightly supercooled stratiform clouds is still not well documented or understood. 

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Impact of Dispersion on CAM5 Cloud Radiative and Aerosol Indirect Effects
Jul 18, 2017       
Accurate representation of cloud microphysics and aerosol-cloud interactions is essential to improving the ability of large-scale models to simulate clouds, precipitation, and aerosol indirect effects, and much remains to be done. Particularly understudied is the spectral dispersion of cloud droplet size distribution--how water is distributed among cloud droplets of different sizes--and its influence on large-scale [...]

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Urban Pollution Affects the Production of Organic Particulate Matter from Isoprene in Amazonia
Jul 06, 2017       
Isoprene is a major precursor to organic particulate matter (PM) over tropical forests. Isoprene epoxydiols (IEPOX), produced from isoprene peroxides under HO2-dominant conditions, is an important intermediate for production of PM. Using field measurements from a site 70 km downwind of Manaus, Brazil, this study investigated the influence of anthropogenic factors, namely concentrations of nitrogen oxides [...]

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An Observational Target for Improving Mid-latitude Deep Convection in Cloud and Climate Models
Jun 21, 2017       
Thunderstorms play a major role in the Earth's energy and water budgets, but the processes that determine outflow crystal sizes remain poorly understood and therefore poorly represented in cloud and climate models. Here we use observations to show that ice crystal sizes coming out of thunderstorms are commonly far too large, providing robust guidance for [...]

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