位涡在暴雨成因分析中的应用  

APPLICATION OF POTENTIAL VORICITY THEORY TO ANALYSIS OF FORMATIVE MACHANISM OF TORRENTIAL RAIN

作　　者：王建中[1] 马淑芬[1] 丁一汇[1] 

机构地区：[1]中国气象科学研究院

出　　处：《应用气象学报》1996年第1期19-27,共9页Journal of Applied Meteorological Science

基　　金：85-906-08-06-06课题

摘　　要：应用位涡理论，对１９９１年江淮地区一次特大暴雨过程中位涡及其有关物理量的分布特征进行了分析．结果表明：强降水总是落在干位涡比较小的地方和湿位涡负中心暧气流一侧，它和相对湿位涡的关系更直接．湿位涡斜压部分可清楚地反映湿斜压性对对流不稳定系统所起的作用．大气在湿位涡值比较小的区域对锋生强迫有更强的响应．By using the concept of potential vorticty,the characteristics of potential vorticity and other corresponding physical quantities are analyzed in the process of excessively heavy rain over the Changjiang-Huaihe River basin in 1991. It is shown that the strong precipitation area is located in the lower value area of dry potential vorticity and at the warm side of negative wet potential vorticity center, and it is related directively to relative wet potential vorticity. The baroclinic part of wet potential vorticity can reflect clearly the role of wet baroclinity in the convectively instable systems. There is a stronger response to frontgenetical forcings in the atmosphere where the value of wet potential vorticity is relatively small.

关 键 词：暴雨 位涡 锋生强迫 成因 

分 类 号：P458.121.1[天文地球—大气科学及气象学]