湿位涡在云南冰雹天气分析中的应用  

DIAGNOSTIC ANALYSIS OF MOIST POTENTIAL VORTICITY FOR HAIL IN SOUTHERN YUNNAN

作　　者：李英[1] 段旭[2] 

机构地区：[1]南京大学大气科学系,南京210093 [2]云南省气象台,昆明650034

出　　处：《应用气象学报》2000年第2期242-248,共7页Journal of Applied Meteorological Science

基　　金：中国气象局青年气象科学基金资助

摘　　要：应用湿位涡理论 ,对 1 997年 3月云南南部频繁发生的几次冰雹天气进行了诊断分析 .结果表明 :在 θe陡立密集区 ,湿斜压涡度发展 ,密集区内冰雹容易发生 ;在降雹区低层为对流稳定的层结下 ( MPV1 >0 ) ,有 MPV2 <0 ,使湿斜压不稳定增强 ,倾斜涡度得以发展 ;冰雹易在MPV2负值区南侧或By using the concept of moist potential vorticity, the characteristics of moist potential vorticity are analyzed in several hail events over southern Yunnan on March, 1997. The results show that very stiff moist isentropes could lead to the development of moist slantwise vorticity and the initiation of hails. The lower atmosphere has convective stability ( MPV 1>0) in hail area, but the development of moist slantwise vorticity ( MPV 2<0) could be a favorable condition to the severe convection there.Moreover, it is a good environment for hail weather to develop on the north side of areas where MPV 2>0 and the south side of areas where MPV 2<0.

关 键 词：湿位涡 倾斜涡度发展 冰雹 天气分析 云南 

分 类 号：P458.121[天文地球—大气科学及气象学]