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	A diagnostic study of heavy rainfall in karachi due to merging of a mesoscale low and a diffused tropical depression during south asian summer monsoon
	Rasul, G; Chaudhry, QUZ; Zhao, SX; Zeng, QC; Qi, LL; Zhang, GY
刊名	Advances in atmospheric sciences
	2005-05-01
卷号	22期号:3页码:375-391
关键词	Mesoscale low Tropical depression Heavy downpour Cross-latitude influence
ISSN号	0256-1530
通讯作者	Rasul, g(grmet@yahoo.com)
英文摘要	This paper presents the results of a diagnostic study of a typical case of very heavy rainfall during the south asian summer monsoon when a mesoscale low in a desert climate merged with a diffused tropical depression. the former low was located over pakistan's desert region and the latter depression originated over the bay of bengal. surface and ncep reanalysis data supported by satellite and radar images were incorporated in the diagnosis. the relationship between the heavy precipitation process and large-scale circulations such as monsoon trough, subtropical high, westerly jet, low level jet and water vapor transport were investigated to further understand the mechanism of this peculiar interaction. it was found that: (1) the mesoscale low developed as a result of cold air advection aloft from northern latitudes and strong convection over the region of humidity convergence on 24 july 2003 over the indian rajistan area. (2) on the same day, a low that formed over the bay of bengal was transformed into a monsoon depression and moved westward to the mesoscale low which existed over southwest india and the adjoining southeastern parts of pakistan. (3) initially, the mesoscale low received moisture supply from both the bay of bengal as well as the arabian sea, whereas the bay of bengal maintained the continuous supply of moisture to the monsoon depression. (4) after the depression crossed central india, the bay's moisture supply was cut off and the arabian sea became the-only source of moisture to both the closely located systems. on 27 july, both of the systems merged together and the merger resulted in a heavy downpour in the karachi metropolitan and in its surroundings. (5) with the intensification as well as the southeastward extension of the subtropical high and the shift of the monsoon trough axis from southwest-west to northeast-east, the monsoon depression moved southwestward. in this situation, there existed a very favourable condition for a merger of the two systems in the presence of cross-latitude influence. (6) a number of convective cloud clusters were developed and organized in the mesoscale low. probably, interactions existed among the multi-scale systems.
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000229329000007
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2377942
专题	中国科学院大学
通讯作者	Rasul, G
作者单位	1.Meteorol Serv Pakistan, Islamabad, Pakistan 2.Chinese Acad Sci, Inst Atmospher Phys, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Rasul, G,Chaudhry, QUZ,Zhao, SX,et al. A diagnostic study of heavy rainfall in karachi due to merging of a mesoscale low and a diffused tropical depression during south asian summer monsoon[J]. Advances in atmospheric sciences,2005,22(3):375-391.
APA	Rasul, G,Chaudhry, QUZ,Zhao, SX,Zeng, QC,Qi, LL,&Zhang, GY.(2005).A diagnostic study of heavy rainfall in karachi due to merging of a mesoscale low and a diffused tropical depression during south asian summer monsoon.Advances in atmospheric sciences,22(3),375-391.
MLA	Rasul, G,et al."A diagnostic study of heavy rainfall in karachi due to merging of a mesoscale low and a diffused tropical depression during south asian summer monsoon".Advances in atmospheric sciences 22.3(2005):375-391.

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