2011年2月喀什一次暴雪天气过程分析  

Analysis of a Heavy Snowstorm of Kashi in February 2011

作　　者：杨利鸿 周宏 玛依热.艾海提 艾散江.玉苏英 海米提.斯拉木 段永生 田洪 

机构地区：[1]喀什地区气象台,新疆喀什844000 [2]岳普湖县气象局,新疆岳普湖844000 [3]叶城县气象局,新疆叶城844900 [4]吐尔尕特气象站,新疆喀什844000 [5]英吉沙县气象局,新疆英吉沙844500

出　　处：《沙漠与绿洲气象》2015年第5期69-74,共6页Desert and Oasis Meteorology

基　　金：中国沙漠气象科学研究基金(Sqj2012004);中国气象局预报员专项(CAMYBY2015-087)共同资助

摘　　要：应用常规观测资料,NCEP1°×1°资料,静止卫星FY-2C红外云图和多普勒雷达资料,分析了2011年2月25—28日喀什地区暴雪天气的成因。结果表明:此次暴雪是在冬季显著变暖的背景下,由中亚低槽、萨彦岭低涡共同影响造成的喀什地区范围广、强度大的大降雪过程。中亚低槽先加深、后减弱北收持续影响是喀什长时间降雪的主要原因。暴雪过程中有明显的低层辐合、高层辐散及低空偏东急流;高空西南气流、低层持久的偏东急流为大降水提供了充足的水汽。多普勒雷达的反射率因子回波图上表现为强的东西入流辐合区,平均径向速度图上也有明显的呈"S"形的零速度线,表明雷达上空风随高度顺转有暖平流存在。Applicating the conventional observation data, NCEP1°×1° information, geostationary satellite FY-2C infrared imagery and Doppler radar data, authors analyzed the causes of heavy snow in Kashi prefecture in February 25th-28th, 2011.The results showed that：the blizzard is a wide range and high intensity of large snowfall process influenced by significant warming in winter background,central-Asia low trough and Sayan vortex.The low trough in central Asia weakened and stopped in north,after deepening.Sustained impact is mainly due to prolonged snowfall in Kashi prefecture.There are significant low-level convergence, upper divergence and low-level easterly jet in the progress of blizzard. Latitude southwest flow, the underlying persistence easterly jet stream provided sufficient moisture to the heavy rain.In the Doppler radar reflectance factor echocardiogram shows the strong east-west inflow convergence zone,average radial velocity chart also showed significant S-shaped zero speed line,which presented wind with height clockwise over radar had warm advection.

关 键 词：暴雪 环流形势 水汽通量 雷达回波 

分 类 号：P458.121[天文地球—大气科学及气象学]