2008年初贵州冰冻天气锋生场诊断分析  

Analysis of Frontogenesis Field for Early 2008 Frozen Weather in Guizhou Province

作　　者：池再香 杜正静[2] 龙先菊 曾居仁 李蜀黔 

机构地区：[1]贵州省六盘水市气象台 [2]贵州省气象科技服务中心 [3]贵州省黔东南州气象台 [4]贵州省气象局 [5]贵州省威宁县气象局

出　　处：《气象科技》2010年第5期558-564,共7页Meteorological Science and Technology

基　　金：贵州省气象局气象科技开放研究基金项目(黔气科合KF[2008]16)资助

摘　　要：利用常规气象观测资料、ECMWF模式和NCEP/NCAR资料,对2008年1—2月贵州省发生的持续时间长、强度强、范围广的冰冻天气进行大气环流形势和锋生函数诊断分析。结果表明:持续冰冻灾害天气过程是冷锋从东北、正北、西北方向移到贵州时产生的一种强烈锋生过程,且长时间稳定地维持在贵州;北半球中高纬度出现双阻型高压,使大气环流长时间稳定,北支、南支锋区偏南,极地冷空气不断补充南下影响到江南,滇黔静止锋不断锋生并长时间维持在贵州西部,南支槽前的西南气流对这次雨雪天气的产生和发展起着重要的作用;地形在冷空气移动过程中具有阻碍作用。因此,低层锋生的长期维持使南来的水汽受阻是产生此次冰冻灾害的重要物理机制。The conventional observation, ECMWF model, and NCEP/NCAR data are used in the diagnostic analysis of the circulation pattern and the frontogenesis function for the long-duration, high- intensity and wide-range frozen weather occurred in January and February 2008. The results show that the continuous frozen disaster was a process of strong frontogenesis resulted from the cold front moving to Guizhou from north, northeast, or northwest, persisted for long time steadily, under the general circulation of two blocking highs over the Ural and Aleutian at the mid-high latitudes in the Northern Hemisphere. The north and south branch fronts were further south and favorite to the cold air moving to the south, so the quasi-stationary front produced frontogenesis ceaselessly and remained in the western Guizhou. The dynamic mechanisms of causing snowstorms in the eastern Guizhou include upper-level divergence, lower-level convergence, and their responses to strong ascending motion and cyclonic vorticity. The southwest air current in front of Southern Trough and the terrain-blocked movement of cold air are important for the emergence and development of the process.

关 键 词：持续冰冻 冷锋 静止锋 锋生 贵州 

分 类 号：P458.121.1[天文地球—大气科学及气象学]