2003年江淮梅雨暴雨与湿位涡的关系  

Relationship between MPV and Meiyu Rainstorms in 2003 in Jianghuai Area

作　　者：张端禹[1] 丁治英[1] 张兴强[2] 徐海明[1] 

机构地区：[1]南京信息工程大学大气科学系 [2]泰安市气象局,山东泰安271000

出　　处：《南京气象学院学报》2006年第4期526-532,共7页Journal of Nanjing Institute of Meteorology

基　　金：国家重点基础研究发展规划项目(2004CB4183032004CB418304)

摘　　要：统计了2003年发生在江淮地区的梅雨暴雨,根据暴雨中心对流稳定度及降雨性质将暴雨分为4种类型。分析湿位涡与梅雨暴雨中的惯性不稳定、对称不稳定、对流不稳定的关系发现:第1类暴雨往往与对称不稳定有关,第2类暴雨与对流不稳定有关,且这两类暴雨高层多具有强惯性不稳定,降水相对较大;第3、第4类暴雨是稳定性降雨,高层一般不具备惯性不稳定,雨量一般较小。高层的惯性不稳定对降水的加强作用明显。Meiyu rainstorms occurred in the Changjiang-Huaihe River valley in 2003 are classified into four categories according to the convective stability and precipitation property at the center of rainstorm, and the ralationships of moist potential vorticity with inertial,symmetry,and convective instabilities are analyzed. The analyses suggest that the first and second categories of rainstorms are associated commonly with the strong inertial instability in the upper troposphere, as well as respectively with symmetry and convective instabilities, and their rainfall is large;and the third and fourth categories generally produce stable precipitation with a small rainfall, and their upper tropospheres are usually inertially stable. Therefore, the effect of the inertial instability in the upper troposphere in enhancing the precipitation of Meiyu rainstorms is evident.

关 键 词：梅雨暴雨 湿位涡 湿对称不稳定 惯性不稳定 

分 类 号：P426.62[天文地球—大气科学及气象学]