2005年3月西藏强降雪过程的波包分布及传播特征
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郭胜利1,2,葛非1,2,马荣3,肖天贵4,唐玮玮5  
基金项目:江苏省研究生培养创新工程(CXZZ11_0626)
中文摘要:利用NCEP/NCAR再分析资料,采用波包传播的诊断方法,对2005年3月24—25日发生在西藏中东部地区的强降雪过程中波包的传播和积累特征进行分析,发现500 hPa高度场波包分布特征与强降雪产生的区域有着较好的对应关系,在强降雪产生的时段内,高度场扰动能量有着明显的积累和增强。从波包的传播特征来看,受印度洋和孟加拉湾低值系统活跃的影响,来自孟加拉湾的暖湿气流不断向青藏高原输送,继而为西藏林芝地区强降雪过程提供了充足的水汽来源。高纬的冷空气南下与西南气流交汇促使了这次强降雪天气过程的产生。
中文关键词:波包传播诊断  强降雪过程  扰动能量
 
Wave packet propagation characteristics of the strong snowstorm in Tibet in March of 2005
Abstract:By using the NCEP/NCAR reanalysis data and the diagnosis analysis method of wave packet propagation(WPD),the wave packet propagation and accumulation characteristics of the heavy snowstorm on March 24—25,2005 in Tibet were analyzed.Results show that the characteristics of wave packet were in better accordance with the snowfall area at 500 hPa.The perturbation energy accumulated and increased obviously during the heavy snowfall process.This process was mainly influenced by the low value system of the Indian Ocean and the Bay of Bengal,which transported sufficient vapor to Linzhi area.The cold air from high latitude area and the southwest airflow interacted with each other,which also promoted the occurrence of this heavy snowstorm process.
keywords:wave packet propagation diagnosis(WPD)  heavy snowstorm process  perturbation energy
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