Sensitivity of warm clouds to large particles in measured marine aerosol size distributions &ndash; a theoretical study

doi:10.5194/acp-2020-314

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-314
	Sensitivity of warm clouds to large particles in measured marine aerosol size distributions - a theoretical study
	Tom Dror, J. Michel Flores, Orit Altaratz, Guy Dagan, Zev Levin, Assaf Vardi, and Ilan Koren
	2020-06-10
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
英文摘要	Aerosol size distribution has major effects on warm cloud processes. Here, we use newly acquired marine aerosol size distributions (MSD), measured in-situ over the open ocean during the Tara Pacific expedition (2016–2018), to examine how the total aerosol concentration (N_tot) and the shape of the MSD change warm cloud's properties. For this, we used a toy-model with detailed bin-microphysics. The changes in the MSDs affected the clouds' total mass and surface precipitation. In general, the clouds showed higher sensitivity to changes in N_tot 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 N_tot, most of the MSDs drove an expected non-monotonic trend of mass and precipitation. However, the addition of GCCN and UGCCN drastically changed this trend, such that surface rain saturated and the mass monotonically increased with N_tot. GCCN and UGCCN changed the interplay between the microphysical processes by triggering early initiation of collision-coalescence. The early fall-out 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.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/274338
专题	地球科学
推荐引用方式 GB/T 7714	Tom Dror, J. Michel Flores, Orit Altaratz, Guy Dagan, Zev Levin, Assaf Vardi, and Ilan Koren. Sensitivity of warm clouds to large particles in measured marine aerosol size distributions - a theoretical study[J]. Atmospheric Chemistry and Physics,2020.
APA	Tom Dror, J. Michel Flores, Orit Altaratz, Guy Dagan, Zev Levin, Assaf Vardi, and Ilan Koren.(2020).Sensitivity of warm clouds to large particles in measured marine aerosol size distributions – a theoretical study.Atmospheric Chemistry and Physics.
MLA	Tom Dror, J. Michel Flores, Orit Altaratz, Guy Dagan, Zev Levin, Assaf Vardi, and Ilan Koren."Sensitivity of warm clouds to large particles in measured marine aerosol size distributions – a theoretical study".Atmospheric Chemistry and Physics (2020).