干旱区生态环境知识资源中心(Arid): Structural Variation of an Atmospheric Heat Source over the Qinghai-Xizang Plateau and Its Influence on Precipitation in Northwest China

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	Structural Variation of an Atmospheric Heat Source over the Qinghai-Xizang Plateau and Its Influence on Precipitation in Northwest China
	WEI Na; GONG Yuanfa; HE Jinhai
来源期刊	Advances in Atmospheric Sciences
ISSN	0256-1530
出版年	2009
卷号	26 期号:5 页码:1027-1041
英文摘要	NCEP/NCAR reanalysis data and a 47-year precipitation dataset are utilized to analyze the relationship between an atmospheric heat source (hereafter called ) over the Qinghai-Xizang Plateau (QXP) and its surrounding area and precipitation in northwest China.Our main conclusions are as follows:(1) The horizontal distribution of and its changing trend are dramatic over QXP in the summer.There are three strong centers of over the south side of QXP with obvious differences in the amount of yearly precipitation and the number of heat sinks predominate in the arid and semi-arid regions of northwest China (NWC),beside the northern QXP with an obvious higher intensity in years with less precipitation.(2) In the summer,the variation of the heat source's vertical structure is obviously different between greater and lesser precipitation years in eastern northwest China (ENWC).The narrow heat sink belt forms between the northeast QXP and the southwestern part of Lake Baikal.In July and August of greater precipitation years,the heating center of the eastern QXP stays nearly over 35°N,and at 400 hPa of the eastern QXP,the strong upward motion of the heating center constructs a closed secondary vertical circulation cell over the northeast QXP (40°-46°N),which is propitious to add precipitation over the ENWC.Otherwise,the heating center shifts to the south of 30°N and disappears in July and August of lesser precipitation years,an opposite secondary circulation cell forms over the northeast QXP,which is a disadvantage for precipitation.Meanwhile,the secondary circulation cell in years with more or less precipitation over the ENWC is also related to the heat source over the Lake Baikal. (3) The vertical structure of the heat source over the western QXP has obvious differences between greater and lesser precipitation years in western northwest China in June and July.The strong/weak heat source over the western QXP produces relatively strong/weak ascending motion and correspondingly constructs a secondary circulation cell in lesser/greater precipitation years.
英文关键词	Qinghai-Xizang Plateau atmospheric heat source/sink greater/lesser precipitation years northwest China
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:3649889
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335011
作者单位	WEI Na, Shaanxi Provincial Climate Center, Xi'an, Shaanxi 710015, China.; GONG Yuanfa, Center for Plateau Atmospheric and Environmental Research,Department of Atmospheric Science,Chengdu University of Information Technology, Chengdu 610225.; HE Jinhai, College of Atmosphere Sciences,Nanjing University of Information Science and Technology, Nanjing, Jiangsu 210044, China.
推荐引用方式 GB/T 7714	WEI Na,GONG Yuanfa,HE Jinhai. Structural Variation of an Atmospheric Heat Source over the Qinghai-Xizang Plateau and Its Influence on Precipitation in Northwest China[J],2009,26(5):1027-1041.
APA	WEI Na,GONG Yuanfa,&HE Jinhai.(2009).Structural Variation of an Atmospheric Heat Source over the Qinghai-Xizang Plateau and Its Influence on Precipitation in Northwest China.Advances in Atmospheric Sciences,26(5),1027-1041.
MLA	WEI Na,et al."Structural Variation of an Atmospheric Heat Source over the Qinghai-Xizang Plateau and Its Influence on Precipitation in Northwest China".Advances in Atmospheric Sciences 26.5(2009):1027-1041.