一次局地暴雨过程的湿位涡诊断分析  

Diagnostic analysis of moist potential vorticity for local heavy rain

作　　者：王宏[1,2] 寿绍文[1] 王万筠[3] 马凤莲 

机构地区：[1]南京信息工程大学大气科学系,江苏南京210044 [2]河北省承德市气象局,河北承德067000 [3]天津市塘沽区气象局,天津300457

出　　处：《自然灾害学报》2009年第3期129-134,共6页Journal of Natural Disasters

基　　金：国家自然科学基金项目(40875025,40775033、40575022、40405009)

摘　　要：利用绝热、无摩擦大气湿位涡守恒理论和常规的地面观测资料、NCEP再分析资料(水平分辨率1°×1°),对河北省东北部2008年6月25日的局地暴雨过程的湿位涡场进行了诊断和分析。结果表明,MPV1"正负值区垂直叠加"的配置提供了暴雨发生、发展的有利形势;湿位涡在这次暴雨过程前期850hPa上MPV1<0及MPV2>0的演变,综合反映了暴雨区对流不稳定和斜压不稳定的增强;暴雨区位于对流层低层MPV1零线附近、MPV2过渡带的等值线密集区内;Diagnosis of moist potential vorticity was made for a local heavy rain which occurred in northeast of Hebei Province on June 25,2008 by using the moist potenlial vorticity（MPV） theory, the routine surface observational data as well as NCEP reanalysis data（ 1 ~ x 1 ~） . The results show that the overlapping of the positive and negative MPV1 area is advantageous to the appearance and development of rainstorm. The evolution of MPV1 〈0 and MPV2 〉 0 at 850hPa level at the early stage of the rainstorm reflects convective instability and the intensification of ba- roclinie instability in the rainstorm area. The rainstorm area is located near the zero line of MPV1 and contour-intensive areas of MPV2＇ s ecotone in lower troposphere. The zone with large value of the moist potential vortieity has a better correspondence with the location of the heavy rain.

关 键 词：暴雨 湿位涡 诊断分析 

分 类 号：P458.2[天文地球—大气科学及气象学]