气候变化领域集成服务门户(CCPortal): Observed and Simulated Variability of Droplet Spectral Dispersion in Convective Clouds Over the Amazon

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DOI	10.1029/2021JD035076
	Observed and Simulated Variability of Droplet Spectral Dispersion in Convective Clouds Over the Amazon
	Hernández Pardo L.; Machado L.A.T.; Morrison H.; Cecchini M.A.; Andreae M.O.; Pöhlker C.; Pöschl U.; Rosenfeld D.; Vendrasco E.P.; Voigt C.; Wendisch M.; Pöhlker M.L.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:20
英文摘要	In this study, the variability of the spectral dispersion of droplet size distributions (DSDs) in convective clouds is investigated. Analyses are based on aircraft measurements of growing cumuli near the Amazon basin, and on numerical simulations of an idealized ice-free cumulus. In cleaner clouds, the relative dispersion (Formula presented.), defined as the ratio of the standard deviation to the mean value of the droplet diameter, is negatively correlated with the ratio of the cloud water content ((Formula presented.)) to the adiabatic liquid water content ((Formula presented.)), while no strong correlation between (Formula presented.) and (Formula presented.) is seen in polluted clouds. Bin microphysics numerical simulations suggest that these contrasting behaviors are associated with the effect of collision-coalescence in cleaner clouds, and secondary droplet activation in polluted clouds, in addition to the turbulent mixing of parcels that experienced different paths within the cloud. Collision-coalescence simultaneously broadens the DSDs and decreases (Formula presented.), explaining the inverse relationship between (Formula presented.) and (Formula presented.) in cleaner clouds. Secondary droplet activation broadens the DSDs but has little direct impact on (Formula presented.). The combination of a rather modest DSD broadening due to weak collision-coalescence with enhanced droplet activation in both diluted and highly undiluted cloud regions may contribute to maintain a relatively uniform (Formula presented.) within polluted clouds. These findings can be useful for parameterizing the shape parameter ((Formula presented.)) of gamma DSDs in bulk microphysics cloud-resolving models. It is shown that emulating the observed (Formula presented.) relationship improves the estimation of the collision-coalescence rate in bulk microphysics simulations compared to the bin simulations. © 2021. The Authors.
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/236957
作者单位	Multiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz, Germany; Centro de Previsão de Tempo e Estudos Climáticos, Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista, Brazil; Mesoscale and Microscale Meteorology Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Institute of Physics, University of Sao Paulo, São Paulo, Brazil; Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States; Department of Geology and Geophysics, King Saud University, Riyadh, Saudi Arabia; Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel; Institut für Physik der Atmosphäre, Deutsches Zentrum für Luft und Raumfahrt, Wessling, Germany; Institut für Physik der Atmosphäre, Johannes Gutenberg-Universität Mainz, Mainz, Germany; Leipziger Institut für Meteorologie, Universität Leipzig, Leipzig, Germany
推荐引用方式 GB/T 7714	Hernández Pardo L.,Machado L.A.T.,Morrison H.,et al. Observed and Simulated Variability of Droplet Spectral Dispersion in Convective Clouds Over the Amazon[J],2021,126(20).
APA	Hernández Pardo L..,Machado L.A.T..,Morrison H..,Cecchini M.A..,Andreae M.O..,...&Pöhlker M.L..(2021).Observed and Simulated Variability of Droplet Spectral Dispersion in Convective Clouds Over the Amazon.Journal of Geophysical Research: Atmospheres,126(20).
MLA	Hernández Pardo L.,et al."Observed and Simulated Variability of Droplet Spectral Dispersion in Convective Clouds Over the Amazon".Journal of Geophysical Research: Atmospheres 126.20(2021).