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DOI	10.5194/acp-19-10717-2019
	Core and margin in warm convective clouds-Part 1: Core types and evolution during a cloud's lifetime
	Heiblum R.H.; Pinto L.; Altaratz O.; Dagan G.; Koren I.
发表日期	2019
ISSN	16807316
起始页码	10717
结束页码	10738
卷号	19 期号:16
英文摘要	The properties of a warm convective cloud are determined by the competition between the growth and dissipation processes occurring within it. One way to observe and follow this competition is by partitioning the cloud to core and margin regions. Here we look at three core definitions, namely positive vertical velocity (Wcore), supersaturation (RHcore), and positive buoyancy (Bcore), and follow their evolution throughout the lifetime of warm convective clouds. Using single cloud and cloud field simulations with binmicrophysics schemes, we show that the different core types tend to be subsets of one another in the following order: Bcore RHcore Wcore. This property is seen for several different thermodynamic profile initializations and is generally maintained during the growing and mature stages of a cloud's lifetime. This finding is in line with previous works and theoretical predictions showing that cumulus clouds may be dominated by negative buoyancy at certain stages of their lifetime. The RHcore-Wcore pair is most interchangeable, especially during the growing stages of the cloud. For all three definitions, the core-shell model of a core (positive values) at the center of the cloud surrounded by a shell (negative values) at the cloud periphery applies to over 80% of a typical cloud's lifetime. The core-shell model is less appropriate in larger clouds with multiple cores displaced from the cloud center. Larger clouds may also exhibit buoyancy cores centered near the cloud edge. During dissipation the cores show less overlap, reduce in size, and may migrate from the cloud center. © Author(s) 2019.
语种	英语
scopus关键词	buoyancy; convective cloud; cumulus; dissipation; supersaturation; thermodynamics
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/144198
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
推荐引用方式 GB/T 7714	Heiblum R.H.,Pinto L.,Altaratz O.,et al. Core and margin in warm convective clouds-Part 1: Core types and evolution during a cloud's lifetime[J],2019,19(16).
APA	Heiblum R.H.,Pinto L.,Altaratz O.,Dagan G.,&Koren I..(2019).Core and margin in warm convective clouds-Part 1: Core types and evolution during a cloud's lifetime.Atmospheric Chemistry and Physics,19(16).
MLA	Heiblum R.H.,et al."Core and margin in warm convective clouds-Part 1: Core types and evolution during a cloud's lifetime".Atmospheric Chemistry and Physics 19.16(2019).