2009年秋季沈丘县连阴雨天气过程分析  

Analysis of a Continuous Overcast Rain Process in Autumn of 2009 in Shenqiu County

作　　者：马荣[1] 刘净净[1] 高昕[1] 徐占伟[1] 朱贤花 梁思琦 

机构地区：[1]沈丘县气象局,河南沈丘466300

出　　处：《气象与环境科学》2010年第B09期79-82,共4页Meteorological and Environmental Sciences

摘　　要：从环流形势、影响系统和水汽条件等方面分析了2009年9月7—20日沈丘县出现的历史罕见的秋季连阴雨天气过程的成因：副高脊线位于25°N以北、西伸脊点位于108°E，北部冷空气南下受副高阻挡，在40—50°N形成平直西风带锋区，锋区南侧偏西西北干冷气流与副高边缘西南暖湿气流交汇，切变系统频繁建立，是导致该区连阴雨天气的产生机制。亚洲两槽-脊型建立，蒙古东部低涡加强、东移南下，副高脊线南撤至20°N附近，预示了连阴雨天气结束。A rare continuous overcast rain Based on the circulation, the influence system, weather occurred in Shenqiu the vapor condition and so on, county September 7-20. the causes of weather were analyzed. The results show that the subtropical high ridge is in the north of the 25°N, the western end of the ridge lies in 108°E. The north cold air was blocked by the subtropical high when it is moving southward, then a frontal zone of flat westerly zone forms in 40-50°N, the northwesterly dry and cold flow in south of the frontal zone crosses with the southwesterly warm and wet flow in the edge of the subtropical high, the shear systems form frequently. All of this is the mechanism of continuous overcast rain. Asia two slot one spine types form, the Mongolia eastern low vortexes strengthen and move eastward and southward, the subtropical high ridges move to 20°N, which indicate the continues overcast rain will be over.

关 键 词：连阴雨天气过程 环流形势 影响系统 水汽条件 

分 类 号：P458.3[天文地球—大气科学及气象学]