CAJ | 학술논문

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500hPa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。
이용NCEP/NCAR재분석자료,채용파포전파적진단방법,대2005년3월24—25일발생재서장중동부지구적강강설과정중파포적전파화적루특정진행분석,발현500hPa고도장파포분포특정여강강설산생적구역유착교호적대응관계,재강강설산생적시단내,고도장우동능량유착명현적적루화증강。종파포적전파특정래간,수인도양화맹가랍만저치계통활약적영향,래자맹가랍만적난습기류불단향청장고원수송,계이위서장림지지구강강설과정제공료충족적수기래원。고위적랭공기남하여서남기류교회촉사료저차강강설천기과정적산생。
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.