河北东北部暴雪天气过程的湿位涡分析  

Analysis on Moist Potential Vorticity for Snowstorm Process in the Northeast of Hebei Province

作　　者：王宏 王万筠 余锦华[3] 王丛梅 王新龙 

机构地区：[1]承德市气象局,河北承德067000 [2]塘沽区气象局,天津300457 [3]南京信息工程大学大气科学学院,江苏南京210044 [4]邢台市气象局,河北邢台054000 [5]河北省气象局,河北石家庄050021

出　　处：《高原气象》2012年第5期1302-1308,共7页Plateau Meteorology

基　　金：国家科技支撑计划课题(2007BAC29B0602)资助

摘　　要：应用湿位涡理论,对发生在河北东北部的两场罕见暴雪过程进行了诊断分析。结果表明,暴雪产生在θse陡立密集区附近,θse面的陡立易导致湿斜压涡度的发展,有利于上升运动的显著增强,使降水加剧;降雪天气过程中的MPV1基本为正值,且纯降雪过程的MPV1值大于雨夹雪的MPV1值;MPV2全为负值,密集的极值带状分布与降水带吻合。暴雪天气过程中MPV1明显比MPV2大;对流层高层高值湿位涡下传,有利于位势不稳定能量的储存和释放,使降水增幅。Using the theory of moist potential vorticity,two rare snowstorms occurred in northeast region of Hebei Province are analyzed.The results show that the snowstorm occurred near the stiff and dense zones of pseudo-equivalent potential temperature line,which can lead the development of moist slantwise vorticity to be beneficial to significant enhancement of vertical ascending motion to increase precipitation.The MPV1 is generally a positive value in snow weather,and the MPV1 value in rain and snow is higher than that of in the pure snow weather.MPV2 is completely a negative value.The dense belt distribution of MPV2 is accord with precipitation band.MPV1 is greater than MPV2 during the snowstorm process.The downward spread of high value from the upper troposphere is advantage the release and deposit of instability energy,which results in the amplification of snowstorm.

关 键 词：湿位涡 暴雪 河北东北部 

分 类 号：P426.634[天文地球—大气科学及气象学]