气候变化领域集成服务门户(CCPortal): Characterization of Surface Heterogeneity-Induced Convection Using Cluster Analysis

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DOI	10.1029/2020JD032550
	Characterization of Surface Heterogeneity-Induced Convection Using Cluster Analysis
	Chen J.; Hagos S.; Xiao H.; Fast J.D.; Feng Z.
发表日期	2020
ISSN	2169897X
卷号	125 期号:20
英文摘要	Land-atmosphere interactions and boundary layer processes often control the formation of shallow clouds and subsequently deep convective precipitation over the U.S. Southern Great Plains. In this study, we examine the impacts of large-scale advection on the cloud populations and land-atmospheric coupling observed during the Holistic Interactions of Shallow Clouds, Aerosols, and Land-Ecosystems field campaign in 2016. We performed two large eddy simulations using the Weather Research and Forecasting Model for a day in which the transition from clear-sky to shallow precipitating clouds and isolated deep convection was observed. The control simulation reproduced the overall distribution of cloud populations by using realistic soil conditions with an interactive land model. In the sensitivity simulation where large-scale advection is removed, a strong relationship between the land and boundary layer is found. To study the timing, location, and intensity of convective initiation and the relationship of clouds with land surface properties, a cluster analysis of equivalent potential temperature is performed for the simulation without large-scale advection. That analysis shows that convective clouds first form over regions with higher surface sensible heat flux. Precipitation from those convective clouds likely triggers new updrafts nearby about 2 hr later through the lifting associated with cold pools. The cluster analysis also shows that in addition to the spatial pattern of soil moisture, land use and soil texture in western Oklahoma also influence the location of convective initiation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	atmosphere interactions; cluster analysis; convective initiation; LES modeling
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185697
作者单位	Pacific Northwest National Laboratory, Richland, WA, United States
推荐引用方式 GB/T 7714	Chen J.,Hagos S.,Xiao H.,et al. Characterization of Surface Heterogeneity-Induced Convection Using Cluster Analysis[J],2020,125(20).
APA	Chen J.,Hagos S.,Xiao H.,Fast J.D.,&Feng Z..(2020).Characterization of Surface Heterogeneity-Induced Convection Using Cluster Analysis.Journal of Geophysical Research: Atmospheres,125(20).
MLA	Chen J.,et al."Characterization of Surface Heterogeneity-Induced Convection Using Cluster Analysis".Journal of Geophysical Research: Atmospheres 125.20(2020).