摘要
利用数值预报模式客观分析资料，分析了2007年秋季连阴雨时期大气环流特征、影响系统和物理要素的平均场，结果表明：该次连阴雨的主要成因是大气环流异常且稳定维持，乌拉尔山高压脊偏强，西太平洋副热带高压比常年偏强，脊线偏北；稳定的环流背景下，副高西侧盛行的偏南气流及700hPa西风带短波槽沿副高西北缘东移，是造成长期降水的主要影响系统；动力条件、热力条件、水汽输送条件均有利于黄河流域形成降水。
Based on analysis data of numerical prediction models, the average field of the atmospheric circulation characteristics, influence systems and physical parameters of the continuous rain in autumn of 2007 were analyzed. The results show that the main cause of the continuous rain is atmospheric circulation anomalous and remain stable. The high pressure ridge over the Urals is stronger, the West Pacific subtropical high is stronger, and the ridge line is north than normal. The direct influence systems of long term precipitation are that southerly flow in west of subtropical high and short-wave trough moved toward east along the northwestern margin of the subtropical high at 700 hPa under stable circulation. All conditions of power, thermal and water vapor transfer are conducive to the precipitation formation in the Yellow River basin.
出处
《气象与环境科学》
2010年第B09期51-55,共5页
Meteorological and Environmental Sciences
关键词
秋季连阴雨
环流形势
平均场
continuous rain in autumn
circulation situation
average field
