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DOI	10.5194/acp-20-15297-2020
	Sensitivity of warm clouds to large particles in measured marine aerosol size distributions-a theoretical study
	Dror T.; Michel Flores J.; Altaratz O.; Dagan G.; Levin Z.; Vardi A.; Koren I.
发表日期	2020
ISSN	1680-7316
起始页码	15297
结束页码	15306
卷号	20 期号:23
英文摘要	Aerosol size distribution has major effects on warm cloud processes. Here, we use newly acquired marine aerosol size distributions (MSDs), measured in situ over the open ocean during the Tara Pacific expedition (2016-2018), to examine how the total aerosol concentration (Ntot) and the shape of the MSDs change warm clouds' properties. For this, we used a toy model with detailed bin microphysics initialized using three different atmospheric profiles, supporting the formation of shallow to intermediate and deeper warm clouds. The changes in the MSDs affected the clouds' total mass and surface precipitation. In general, the clouds showed higher sensitivity to changes in Ntot than to changes in the MSD's shape, except for the case where the MSD contained giant and ultragiant cloud condensation nuclei (GCCN, UGCCN). For increased Ntot (for the deep and intermediate profiles), most of the MSDs drove an expected non-monotonic trend of mass and precipitation (the shallow clouds showed only the decreasing part of the curves with mass and precipitation monotonically decreasing). The addition of GCCN and UGCCN drastically changed the non-monotonic trend, such that surface rain saturated and the mass monotonically increased with Ntot. GCCN and UGCCN changed the interplay between the microphysical processes by triggering an early initiation of collision-coalescence. The early fallout of drizzle in those cases enhanced the evaporation below the cloud base. Testing the sensitivity of rain yield to GCCN and UGCCN revealed an enhancement of surface rain upon the addition of larger particles to the MSD, up to a certain particle size, when the addition of larger particles resulted in rain suppression. This finding suggests a physical lower bound can be defined for the size ranges of GCCN and UGCCN. © Author(s) (or their employer(s)) 2021.
语种	英语
scopus关键词	cloud; concentration (composition); in situ measurement; particle size; particulate matter; sensitivity analysis; shape; size distribution; theoretical study
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247290
作者单位	Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel; Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, Oxford, United Kingdom; School of Earth Sciences, Department of Geophysics, Tel Aviv University, Ramat Aviv, Israel; Department of Plant and Environmental Sciences, Weizmann Institute of Science, Rehovot, Israel
推荐引用方式 GB/T 7714	Dror T.,Michel Flores J.,Altaratz O.,et al. Sensitivity of warm clouds to large particles in measured marine aerosol size distributions-a theoretical study[J],2020,20(23).
APA	Dror T..,Michel Flores J..,Altaratz O..,Dagan G..,Levin Z..,...&Koren I..(2020).Sensitivity of warm clouds to large particles in measured marine aerosol size distributions-a theoretical study.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(23).
MLA	Dror T.,et al."Sensitivity of warm clouds to large particles in measured marine aerosol size distributions-a theoretical study".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.23(2020).