干旱区生态环境知识资源中心(Arid): 乌鲁木齐7·17暴雨的天气尺度与中尺度特征

Arid

	乌鲁木齐7·17暴雨的天气尺度与中尺度特征
其他题名	Synoptic Scale and Mesoscale Characteristics of 7·17 Urumqi Heavy Rainfall in 2007
	孔期; 郑永光; 陈春艳
来源期刊	应用气象学报
ISSN	1001-7313
出版年	2011
卷号	22 期号:1 页码:12-22
中文摘要	新疆位于半干旱地区,2007年7月13--18日新疆沿天山一带多站出现暴雨. 利用每分钟与小时降水资料、常规地面与高空观测资料、NCEP 1°*1°再分析资料、静止卫星云图资料与雷达资料进行分析,重点考察2007年7月16--17日乌鲁木齐暴雨过程(7·17暴雨)的天气尺度及中尺度特征,并与1996年同期暴雨过程以及我国东部暴雨过程进行对比. 结果表明:该降水是一次大尺度斜压过程,中亚低涡是该暴雨过程的主要影响系统,但其位置、形态与强度均不同于1996年过程;干冷空气侵入加强了大气的对流性不稳定,对暴雨的加强和发展起重要作用;该暴雨过程的水汽主要来自于青藏高原东部--甘肃西部一线以及南疆北部;该暴雨过程中有明显的gamma-中尺度对流雨团发生,径向速度辐合可能是gamma-中尺度对流雨团的重要触发机制
英文摘要	Xinjiang is located in a semi-arid area, but a heavy rainfall event occurs unexpectedly along the Tianshan Mountains in Xinjiang during 13--18 July 2007.The circulation and the persistent mechanism of the low vortex as well as the mesoscale characteristics for the heavy rainfall in Urumqi during 16--17 July 2007 are analyzed and compared with one similar case in the same period of 1996,by use of the 1-hour and 1-minute precipitation data, geostationary satellite images, conventional surface and upper data,NCEP 1°*1°reanalysis data and the new generation Doppler radar data. The results are as follows:The heavy rainfall takes place under the favorable large-scale circumfluence. It is a large scale heavy rainfall which is related to the baroclinic disturbance. The central-Asian vortex is the major influential system, but the location, form and intensity are different from those of the cases in 1996.The atmospheric stratification turns unstable, but it is weaker comparing with the heavy rainfall in the eastern part of China. The characteristics of the stability are different during different rainfall periods, exhibiting the pattern of both stratiform and convective precipitation. The intrusion of the cold and dry air strengthens the instability of the atmosphere, and plays an important role for the heavy rainfall. The long maintenance of the vortex after the landing in Xinjiang is associated with the high PV anomaly(dry and cold air intrusion) in the upper-middle troposphere. Strong moisture convergence develops rapidly at lower level and the water mainly comes from the eastern part of the Tibetan Plateau, western part of Gansu Province and the north of the Southern Xinjiang Basin. The satellite and radar images show that there are obvious meso-gamma-scale convective rainy cluster with characteristics of the echo pendency, vertical wind shear, but they are much weaker than those heavy rainfall systems in the east region of China. Radar radial base velocity products reveal that the mesoscale radial convergence may be the important trigger mechanism for the mesoscale convective rain cluster. Compared with the rainfall in eastern China, the rainfall in Xinjiang shows the characteristics of both synoptic scale and mesoscale. The water sources are less abundant and the convergence is more important. The instability of atmospheric stratification is not so strong without obvious low-level jet. The intrusion of the cold and dry air comes from the middle level of the troposphere. The mesoscale convective rainy-clusters have the characteristics of the mesoscale convective clouds, but the convection is not too intense as the cloud top black body temperature of the cloud clusters is not too low, and the vertical height of strong echo is not too high, either
中文关键词	新疆暴雨 ; 中亚低涡 ; 水汽输送 ; 中尺度特征
英文关键词	heavy rainfall in Xinjiang the central-Asian vortex water vapor transfer mesoscale characteristics
类型	Article
语种	中文
国家	中国
收录类别	CSCD
WOS类目	Geology
WOS研究方向	Geology
CSCD记录号	CSCD:4154943
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227326
作者单位	孔期, 国家气象中心, 北京 100081, 中国.; 郑永光, 国家气象中心, 北京 100081, 中国.; 陈春艳, 新疆维吾尔自治区气象台, 乌鲁木齐, 新疆 830002, 中国.
推荐引用方式 GB/T 7714	孔期,郑永光,陈春艳. 乌鲁木齐7·17暴雨的天气尺度与中尺度特征[J],2011,22(1):12-22.
APA	孔期,郑永光,&陈春艳.(2011).乌鲁木齐7·17暴雨的天气尺度与中尺度特征.应用气象学报,22(1),12-22.
MLA	孔期,et al."乌鲁木齐7·17暴雨的天气尺度与中尺度特征".应用气象学报 22.1(2011):12-22.