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DOI	10.5194/acp-21-16203-2021
	Revisiting adiabatic fraction estimations in cumulus clouds: high-resolution simulations with a passive tracer
	Eytan E.; Koren I.; Altaratz O.; Pinsky M.; Khain A.
发表日期	2021
ISSN	1680-7316
起始页码	16203
结束页码	16217
卷号	21 期号:21
英文摘要	The process of mixing in warm convective clouds and its effects on microphysics are crucial for an accurate description of cloud fields, weather, and climate. Still, they remain open questions in the field of cloud physics. Adiabatic regions in the cloud could be considered non-mixed areas and therefore serve as an important reference to mixing. For this reason, the adiabatic fraction (AF) is an important parameter that estimates the mixing level in the cloud in a simple way. Here, we test different methods of AF calculations using high-resolution (10m) simulations of isolated warm cumulus clouds. The calculated AFs are compared with a normalized concentration of a passive tracer, which is a measure of dilution by mixing. This comparison enables the examination of how well the AF parameter can determine mixing effects and the estimation of the accuracy of different approaches used to calculate it. Comparison of three different methods to derive AF, with the passive tracer, shows that one method is much more robust than the others. Moreover, this method's equation structure also allows for the isolation of different assumptions that are often practiced when calculating AF such as vertical profiles, cloud-base height, and the linearity of AF with height. The use of a detailed spectral bin microphysics scheme allows an accurate description of the supersaturation field and demonstrates that the accuracy of the saturation adjustment assumption depends on aerosol concentration, leading to an underestimation of AF in pristine environments. © 2021 Eshkol Eytan et al.
语种	英语
scopus关键词	adiabatic process; cloud microphysics; computer simulation; convective cloud; cumulus; tracer
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/246462
作者单位	Department of Earth and Planetary Science, Weizmann Institute of Science, Rehovot, Israel; Institute of Earth Science, Hebrew University, Jerusalem, Israel
推荐引用方式 GB/T 7714	Eytan E.,Koren I.,Altaratz O.,et al. Revisiting adiabatic fraction estimations in cumulus clouds: high-resolution simulations with a passive tracer[J],2021,21(21).
APA	Eytan E.,Koren I.,Altaratz O.,Pinsky M.,&Khain A..(2021).Revisiting adiabatic fraction estimations in cumulus clouds: high-resolution simulations with a passive tracer.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(21).
MLA	Eytan E.,et al."Revisiting adiabatic fraction estimations in cumulus clouds: high-resolution simulations with a passive tracer".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.21(2021).