甘肃陇南两次不同强度暴雨天气的中尺度特征分析  

Mesoscale Analysis on Two Different Intensity Rainstorm Processes in the East of Gansu Province

作　　者：李晓霞[1,2] 尚大成[3] 谌芸[4] 王有生[3] 王勇[3] 

机构地区：[1]中国气象局兰州干旱研究所/甘肃省干旱气候变化与减灾重点实验室/中国气象局干旱气候变化与减灾重点开放实验室,甘肃兰州730020 [2]西北区域气候中心,甘肃兰州730020 [3]兰州中心气象台,甘肃兰州730020 [4]中国气象局国家气象中心,北京100081

出　　处：《高原气象》2013年第5期1389-1399,共11页Plateau Meteorology

基　　金：中国气象局气候变化专项"复杂地形机场建设极端天气评估技术研究"项目(CCSF201305)

摘　　要：利用常规观测资料、自动站地面加密观测资料、卫星云图和NCEP 1°×1°再分析资料,分析了2009年7月16-17日发生在甘肃陇南连续两次不同强降水天气过程的中尺度系统——武都涡、中尺度切变线的发生、发展过程,探讨了两次不同强降水天气过程的云图特征和水汽、热力及动力等物理量场差异,提出了这一类暴雨、大暴雨天气过程的预报着眼点和思路。Using the routine observation data, automic weather station data, the satellite images, NCEP1°×1° reanalysis data, the circulation background of rare, continuous heavy rainstorm weather process in southern Gansu Province in mid-July of 2009 are analyzed, it is important to study the occurrence and de- velopment process of the mesoscale system Wudu vortex and mesoscale shear line in two different time periods, different magnitude rainstorm and heavy rainstorm weather processes in southern Gansu Province on 16--17 July, the cloud image features of two different intensity precipitation processes and the differ- ences of moisture, heat, power and other physical quantity field differences are explored. The result shows that the cold air is one of the important conditions in the heavy rainstorm processes, it makes the Wudu vortex and mesoscale shear line more developing. In the meantime the cold front cloud and the warm cloud merge and form a southwest to northeast cloud band in southern Gansu Province. Several hours of the con- tinuous cloud band causes the heavy rainstorm.

关 键 词：环流背景 TBB 中尺度切变线 武都涡 

分 类 号：P445[天文地球—大气科学及气象学]