气候变化领域集成服务门户(CCPortal): Pressure Drag for Shallow Cumulus Clouds: From Thermals to the Cloud Ensemble

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DOI	10.1029/2020GL090460
	Pressure Drag for Shallow Cumulus Clouds: From Thermals to the Cloud Ensemble
	Gu J.-F.; Stephen Plant R.; Holloway C.E.; Muetzelfeldt M.R.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	This study takes the first step to bridge the gap between the pressure drag of a shallow cloud ensemble and that of an individual cloud composed of rising thermals. It is found that the pressure drag for a cloud ensemble is primarily controlled by the dynamical component. The dominance of dynamical pressure drag and its increased magnitude with height are independent of cloud lifetime and are common features of individual clouds except that the total drag of a single cloud over life cycle presents vertical oscillations. These oscillations are associated with successive rising thermals but are further complicated by the evaporation-driven downdrafts outside the cloud. The horizontal vorticity associated with the vortical structure is amplified as the thermals rise to higher altitudes due to continuous baroclinic vorticity generation. This leads to the increased magnitude of local minima of dynamical pressure perturbation with height and consequently to increased dynamical pressure drag. ©2020. The Authors.
英文关键词	Life cycle; Vorticity; Common features; Dynamical components; Horizontal vorticity; Pressure perturbation; Shallow cumulus clouds; Vertical oscillations; Vortical structures; Vorticity generation; Drag; air temperature; cumulus; drag; ensemble forecasting; evaporation; perturbation; pressure field; shallow water; vorticity
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169393
作者单位	Department of Meteorology, University of Reading, Reading, United Kingdom; National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Gu J.-F.,Stephen Plant R.,Holloway C.E.,et al. Pressure Drag for Shallow Cumulus Clouds: From Thermals to the Cloud Ensemble[J],2020,47(22).
APA	Gu J.-F.,Stephen Plant R.,Holloway C.E.,&Muetzelfeldt M.R..(2020).Pressure Drag for Shallow Cumulus Clouds: From Thermals to the Cloud Ensemble.Geophysical Research Letters,47(22).
MLA	Gu J.-F.,et al."Pressure Drag for Shallow Cumulus Clouds: From Thermals to the Cloud Ensemble".Geophysical Research Letters 47.22(2020).