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DOI10.1029/2021JD035180
Recognition of Inter-Cloud Versus Intra-Cloud Controls on Droplet Dispersion With Applications to Microphysics Parameterization
Hu A.Z.; Igel A.L.; Chuang P.Y.; Witte M.K.
发表日期2021
ISSN2169-897X
卷号126期号:18
英文摘要Aerosols in the atmosphere can have a large impact on weather and climate. One of its lesser-known impacts is the aerosol-dispersion effect, which refers to the feedback between the aerosol (or cloud droplet) concentration and the relative dispersion of the droplet size distribution. This study attempts to reconcile the inconsistent sign of the correlation between aerosol number and droplet dispersion found in past studies by distinguishing local correlation from cloud-mean correlation. We find that while the cloud-mean correlation between aerosol concentration and droplet size relative dispersion is largely nonexistent, in-cloud regions with high relative dispersion are typically associated with low local droplet concentration. Even stronger correlation is found with respect to the local activation fraction (the ratio of droplet concentration to total droplet and aerosol concentration). Based on this local correlation, we propose a new equation to diagnose the shape parameter in marine stratocumulus clouds for double moment bulk schemes in cloud-resolving or large-eddy simulations. This new equation is more physically realistic than many existing ones that are based on the weak cloud-mean correlation. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词aerosol-cloud interaction; bulk scheme parameterization; relative dispersion; stratocumulus
来源期刊Journal of Geophysical Research: Atmospheres
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/236992
作者单位Atmospheric Science Graduate Group, University of California Davis, Davis, CA, United States; Department of Land, Air and Water Resources, University of California Davis, Davis, CA, United States; Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, United States; Department of Meteorology, Naval Postgraduate School, Monterey, CA, United States
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Hu A.Z.,Igel A.L.,Chuang P.Y.,et al. Recognition of Inter-Cloud Versus Intra-Cloud Controls on Droplet Dispersion With Applications to Microphysics Parameterization[J],2021,126(18).
APA Hu A.Z.,Igel A.L.,Chuang P.Y.,&Witte M.K..(2021).Recognition of Inter-Cloud Versus Intra-Cloud Controls on Droplet Dispersion With Applications to Microphysics Parameterization.Journal of Geophysical Research: Atmospheres,126(18).
MLA Hu A.Z.,et al."Recognition of Inter-Cloud Versus Intra-Cloud Controls on Droplet Dispersion With Applications to Microphysics Parameterization".Journal of Geophysical Research: Atmospheres 126.18(2021).
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