干旱区生态环境知识资源中心(Arid): 2012年7月腾格里沙漠2次暴雨过程诊断分析

Arid

	2012年7月腾格里沙漠2次暴雨过程诊断分析
其他题名	Diagnostic Analysis of Two Rainstorms in the Tengger Desert in July, 2012
	朱岩; 左洪超; 王士新; 袁有林; 王利盈
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2016
卷号	33 期号:2 页码:327-337
中文摘要	利用降水实况资料、单站地面资料、FY2E云顶亮温和NCEP、ECMWF格点资料,对2012年7月20日(7·20)、29日(7·29)腾格里沙漠发生的2次暴雨过程进行了诊断分析。结果表明: 20∶ 00局地热力环流在抬升、水汽动量辐合等方面为暴雨提供了有利条件,但它们必须得到天气系统的加强和优化,才能触发中尺度对流天气;沙漠的北边界为持续的水汽输入,南、东边界在暴雨前后由输入转为输出,西边界则由输出转输入,水汽源地在南海、孟加拉湾以及高纬地区; 2次暴雨过程都在有利的大尺度环流背景和高低层天气系统相互作用下产生,垂直方向上形成抽吸结构; 7·29过程前期为强不稳定层结,引发暴雨的中尺度系统是MCC,而7·20过程层结相对较稳定,观测点降水主要由中beta尺度对流系统引起,这是7·29过程降雨大于7·20过程的原因。
英文摘要	A Diagnostic analysis on the formation causes of two rainstorms in the Tengger Desert on July 20 and July 29, 2012 was carried out using the surface precipitation data,meteorological data observed by single station, FY-2E satellite images and gridded data from NCEP and ECMWF FNL. The results showed that despite the local thermodynamic circulation at 20: 00 provided the favorable conditions of occurring rainstorm from the aspects of thermal lifting and convergence of water vapor and momentum, they were too weak to trigger a mesoscale convective weather unless being strengthened and optimized by the force of large scale weather systems. Water vapor was continuously transported to the north boundary of the desert, its input was changed into output over the south and east boundaries around the occurrence of rainstorms,but the situation was opposite over the west boundary. The main sources of water vapor to the study area for forming the 2 rainstorms were the Bengal Bay,South China Sea and high-latitude area. Two rainstorms occurred under the circumstance of favorable large-scale circulation and the interaction between weather systems at different levels,while the vertical configuration of divergence and convergence formed a suction structure to provide the impetus for the intense upward movement. An unstable stratification at the earlier stage of the weather process on July 29 was much stronger than that on July 20,and the heavy rains at the observation site were separately caused by MCC and betaMCS,which was the reason that the rain intensity of the former was much higher than that of the latter.
中文关键词	暴雨 ; 物理量场 ; 诊断分析 ; 局地热力环流 ; 腾格里沙漠
英文关键词	rainstorm physical quantity field diagnostic analysis local thermodynamic circulation Tengger Desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5671904
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234298
作者单位	兰州大学大气科学学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	朱岩,左洪超,王士新,等. 2012年7月腾格里沙漠2次暴雨过程诊断分析[J]. 兰州大学,2016,33(2):327-337.
APA	朱岩,左洪超,王士新,袁有林,&王利盈.(2016).2012年7月腾格里沙漠2次暴雨过程诊断分析.干旱区研究,33(2),327-337.
MLA	朱岩,et al."2012年7月腾格里沙漠2次暴雨过程诊断分析".干旱区研究 33.2(2016):327-337.