A Diagnostic Study of Record Heavy Rain in Twin Cities Islāmābad-Rāwalpindi

作     者：Ghulam RASUL Qamar-uz-Zaman CHAUDHRY 赵思雄 曾庆存 

作者机构：Meteorological Service of Pakistan P. O. Box 1214 Islāamāabad-Pakistan Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 Graduate School Chinese Academy of Sciences Beijing 100039 

出 版 物：《Advances in Atmospheric Sciences》 (大气科学进展（英文版）)

年 卷 期：2004年第21卷第6期

页      面：976-988页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：国家科技部项目 国家科技部项目 第三世界科学院(TWAS)资助 中国科学院项目 国家自然科学基金 

主　　题：monsoon circulation mesoscale systems heavy rainfall 

摘      要：Using surface and NCEP reanalysis data along with radar and satellite images, diagnosis has been carried out to probe the reasons for the very heavy rainfall that occurred in Islāmābad-Rāwalpindi on 23 July 2001. It has been revealed that the sudden evolution of this meso-scale severe weather system was the direct result of strong surface convection in moist and unstable lower layers of the atmosphere. The subsequent rapid development was the combined effect of the presence of the mid latitude westerly’s trough in the north and moisture feeding through monsoon flow along the Himalayas and also the direct south-westerly current from the Arabian Sea. After the westward shifting of the Sub-Tropical High (STH) from the north of India, the strong divergence zone on its eastern edge contributed positively to the development of upward motion. Initially the convective systems moved towards the south and then southeastward following the steering current in the middle troposphere. Based on these analyses, the physical model of the sudden record heavy rainfall has been proposed and a comparison between the heavy rainfall in this case and one in China has been conducted.