Analysis of A Heavy Snow Process in Liaoning Province in 2009  

2009年辽宁省一次暴雪天气过程分析(英文)

作　　者：张炳川[1] 吴晓峰[1] 贾旭轩[1] 陆井龙[1] 

机构地区：[1]辽宁省气象台,辽宁沈阳110016

出　　处：《Meteorological and Environmental Research》2010年第3期107-111,共5页气象与环境研究（英文版）

摘　　要：Based on the conventional meteorological data and 4 times daily NCEP reanalysis data,the causes of rain changing snowstorm in Liaoning during February 12-13 of 2009 were discussed.The low-level jet conditions,temperature conditions and coupling mechanism of water vapor and dynamics of heavy snow were diagnosed and analyzed.The low-level jet provided abundant water vapor for this process.The convergence at low level,divergence in the upper troposphere and strong ascend movement provided dynamic conditions for the snowstorm.The wedging of cold air was the chief cause of rain changing snow.The strongprecipitation area corresponded to the moist potential vorticity well.Based on the conventional meteorological data and 4 times daily NCEP reanalysis data,the causes of rain changing snowstorm in Liaoning during February 12-13 of 2009 were discussed.The low-level jet conditions,temperature conditions and coupling mechanism of water vapor and dynamics of heavy snow were diagnosed and analyzed.The low-level jet provided abundant water vapor for this process.The convergence at low level,divergence in the upper troposphere and strong ascend movement provided dynamic conditions for the snowstorm.The wedging of cold air was the chief cause of rain changing snow.The strongprecipitation area corresponded to the moist potential vorticity well.

关 键 词：Rain changing snow Temperature advection Moist potential vorticity China 

分 类 号：P458.121[天文地球—大气科学及气象学]