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.
出处
《气象科技》
北大核心
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
关键词
持续冰冻
冷锋
静止锋
锋生
贵州
continuous freezing weather, cold front, quasi-stationary front, frontogenesis
作者简介
池再香，女，1965年生，高级工程师，主要从事中短期天气预报和科研工作，Email：qxxf_850@163．com
