2009年6月黑龙江省低温阴雨天气成因初步分析

利用美国国家环境预报中心（NCEP）再分析资料以及74项环流指数等资料,对2009年6月黑龙江省连阴雨天其成因进行初步分析。结果表明,此次连阴雨天气过程与冷空气活动密切相关,是中高纬系统相互作用的结果。鄂霍次克海和乌拉尔山附近地区存在明显的正高度异常,贝加尔湖附近为负高度异常,500hPa位势高度场上欧亚中高纬度地区纬向呈＂＋-＋＂型,这种高度异常形势为鄂霍次克海阻塞形势的形成和维持提供了大尺度环流背景,使东北冷涡长时间影响黑龙江省。在欧亚大陆中高纬度长期出现阻塞形势的背景下,加上低空充足的水汽供应,黑龙江省连续经历了4次冷涡天气造成了此次低温阴雨天气过程。

Preliminary Analysis on the Causes of Rainy and Cold Weather over Heilongjiang Province in June 2009

By using NCEP reanalysis data and 74 factors of atmospheric circulation,the causes of the rainy and cold weather over Heilongjiang Province in June 2009 were analyzed. The results showed that the rainy and cold weather is not only subject to the activity of the cold air,but also closely relate to the interaction of the circulation in mid-high latitudes. Okhot sk Sea and Ural Mountain showed the abnormal of positive height and Baikal Lake showed the abnormal of negative height. The potential height anomaly displayed a" +-+"pattern across Eurasia in the mid-high latitudes of 500 hPa geopotential height,which is in favor of the formation and the maintenance of Okhot sk high,so northeast cold vortexes influence Heilongjiang Province for a long time.Under the background of blocking situation,with the ample vapor supply in low altitude,four times cold vortexes weather cause the rainy and cold weather process in Heilongjiang Province.