2010年春季新疆一次寒潮天气过程分析

Analysis of a Cold Wave in the Spring of 2010 in Xinjiang

综合利用常规天气观测资料、美国NCEP/NCAR再分析资料、ECMWF及T-639数值预报产品,对2010年3月27—29日新疆寒潮天气过程的环流形势演变、动力机制、物理量、卫星云图特征进行了分析。结果表明,此次强寒潮来源于欧洲中部,属西方路径,强冷空气经过黑海-咸海-中亚地区入侵新疆;造成强降水的原因是西方冷空气与中亚南支槽东移北上的暖湿气流在伊犁河谷、天山山区和北疆沿天山一带汇合,并配合动力作用和水汽条件共同形成的。

Based on the conventional surface and upper observation data, NCEP reanalysis data and the products of ECMWF model and T639 model,the circulation patterns,evolution feature, dynamisms mechanism and physical quantity of the cold wave weather process during 27-29 th March 2010 were further studied, as well as satellite cloud data. The analysis confirmed that this strong cold wave came from the middle part of Europe to be the path of Western;the strong cold air moved east,over Black Sea,Aral Sea and central Asia,and then broke into Xinjiang;the main reason of heavy precipitation was due to the cold air from west and the warm air from the southern branch trough of central Asia converged at Yili river valley, Tianshan Mountains and the area along the northern Tianshan mountains,and the combination with the dynamic action and the conditions of water vapor.