沙漠与绿洲气象2012，Vol.6Issue(5)：12-19,8.
新疆一次超极地寒潮天气分析
Analysis of a Super Polar Path Cold Wave in Xinjiang
摘要
Abstract
Based on conventional surface and upper data,NCEP 1 x 1 ~reanalysis data of every 6-h, in terms of the synoptic principle and the dynamic diagnosis,the cold wave during 16-21 January 2012 was analyzed.The results are as follows: the cold wave resulted from the polar cold air outbreak in Xinjiang, belong to the ridge developed in the Caspian Sea and Aral Sea of the Urals ridge class. The cold wave oecoured when super long wave were three waves, polar vortex was located in the Northeast Hemisphere in 100 hPa. two trough-one ridge of the meridional circulation was maintained in the Eurasian range during the cold wave, deep low pressure system located to the European mainland and the Siberia, The Ural blocking high was build up with the same phase interaction between the Caspian Sea-Aral Sea and the Urals ridge, the radial distance of atmospheric circulation larger than 35 zonal distance. When the Ural blocking high gradually declined,the stronger northerly wind in the front of the ridge were favorable to the revising of the transverse trough, meanwhile, the cold air moved southeastwards and invaded into Xinjiang. The greatest sea level pressure were 1 047.5 hPa and 1 071 hPa before and after the invasion of the cold wave.The main reason for the rapid air temperature decrease was the intense cold advection. The dynamic conditions of snowfall was derived from vertical circulation composed of the high-level west jet and the low-level convergence. During the snowfall,the humidity was significantly increased in the middle-low layer. Water vapor in the Northern Xinjiang comes from Aral Sea and Balqash. The latter snowfall was attributed to the condensate cooling under strong cold adveetion. By comparison, ECMWF model was expert in height of 500 hPa, T639 model were better at pressure and temperature forecast.关键词
寒潮/强降温/超极地路径/新疆/冬季Key words
cold wave/strong cooling/super polar path/Xinjiang/winter分类
天文与地球科学引用本文复制引用
李海燕,杨霞,张超..新疆一次超极地寒潮天气分析[J].沙漠与绿洲气象,2012,6(5):12-19,8.基金项目
公益性行业（气象）科研专项（GYHY201106007）资助. （）
