Research Highlights

 

Highlights will be written for high-level accomplishments and published journal articles of ASR research. Each ASR principal investigator (PI) is expected to submit at least one highlight per fiscal year.

Recent Highlights

Climate sensitivity and the direct effect of carbon dioxide in a limited-area cloud-resolving model

20 February 2020

Romps, David

Supported by: ASR

Research area: Cloud Processes

In this study, cloud-resolving simulations are shown to exhibit a dramatic increase in equilibrium climate sensitivity (ECS) at higher temperatures, due to both an increase in forcing and a decrease in the feedback parameter. In addition, it is found that the direct effect of carbon dioxide offsets a quarter of [...]

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Sensitivity of simulated deep convection to a stochastic ice microphysics framework

6 February 2020

Stanford, McKenna; Morrison, Hugh Clifton

Supported by: ARM ASR

Research area: Cloud Processes

Observations show that atmospheric ice particle properties vary at different times and locations even for similar cloud conditions and thermodynamic environments. Yet, the way ice particles are represented in weather and climate models typically does not account for this variability. Herein, we develop a stochastic ice microphysics parameterization that includes [...]

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Estimation of pressure perturbations needed to explain contact nucleation

21 January 2020

Yang, Fan; Vogelmann, Andrew M.

Supported by: ASR

Research area: Cloud Processes

The pressure perturbation hypothesis, which arose from recent lab experiments, has been proposed to explain the long-standing mystery of contact nucleation. However, validating the hypothesis is extremely difficult as it would require measuring pressure perturbations caused by the impact of ice nucleating particles on supercooled droplets. Instead, we improve understanding [...]

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"Fungal shrapnel" found in the air during HI-SCALE

21 January 2020

Smith, James; Lawler, Michael Joseph

Supported by: ARM ASR

Research area: Aerosol Processes

During summer 2016 at the Holistic Interactions of Shallow Clouds, Aerosols, and Land-Ecosystems (HI-SCALE) Field Campaign, we found fragments of biological cells in the atmosphere that were many times smaller and many times more numerous that we knew existed. These fragments are most likely bits of fungal spores that have burst [...]

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Episodes of warm‐air advection causing cloud‐surface decoupling during MARCUS

21 January 2020

Zheng, Youtong Youtong Zheng

Supported by: ARM ASR

Research area: Cloud Processes

Ship observations show that marine clouds can be highly detached from the underlying sea surface fluxes if the clouds move from warm to cold water.  

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