1996年7月洞庭湖流域持续性暴雨过程分析  

A CASE STUDY OF PERSISTENT HEAVY RAINFALL OVER HUNAN PROVINCE IN JULY 1996

作　　者：张小玲[1] 陶诗言[1] 张顺利[1] 张庆云[1] 

机构地区：[1]中国科学院大气物理研究所,北京100029

出　　处：《应用气象学报》2004年第1期21-31,共11页Journal of Applied Meteorological Science

基　　金：国家重点基础研究发展规划项目"我国重大气候和天气灾害形成机理与预测理论研究"第一部分(G1 9980 40 90 3 );第二部分 (G1 9980 40 90 8)的共同资助

摘　　要：1996年 7月洞庭湖流域发生了严重的洪涝灾害。利用观测资料进行诊断分析表明 :( 1 )这次大洪水是由梅雨锋西端高空槽前的持续性大面积暴雨引起 ;( 2 )引起持续性暴雨的直接原因是MCS形成后停滞少动 ,并在同一地区连续多次生消 ;( 3)由于高空槽长时间维持在长江中游地区 ,对流层低层的暖平流等大尺度强迫使暴雨区能较长时间维持上升运动 。The heavy rainfall over Hunan province in July 1996 was studied. The main conclusions is made as follows: (1) Persistent rainstorms causing flash-flood in Hunan province lied in the front of 500 hPa short wave troughs. (2) MCS generated and detained in the same area, which is the direct reason causing lasting heavy rainfall. (3) By warm advection in the lower troposphere and other large-scale forcing, the upper troughs maintained over the middle of the Yangtze River Basin, which brought continuous lifting movement in the rainstorm area. At the same time, continuous moisture convergence and potential instable energy transport in the lower layers provided enough water and energy for lasting heavy precipitation over the rainstorm area.

关 键 词：梅雨锋 暴雨过程分析 高空槽 MCS 大尺度强迫 

分 类 号：P458.121.1[天文地球—大气科学及气象学]