J4 ›› 2009, Vol. 27 ›› Issue (4): 358-361.

• 论文 • 上一篇    下一篇

西北地区一次罕见的秋季连阴雨特征分析

狄潇泓王小勇张培燕   

  1. (1.兰州中心气象台,甘肃 兰州 730020; 2.甘肃省气象科技服务中心,甘肃 兰州 730020)
  • 收稿日期:2009-04-22 修回日期:2009-09-20 出版日期:2010-12-30 发布日期:2009-12-30
  • 作者简介:狄潇泓(1975-),女,甘肃兰州人,工程师,现主要从事天气预报工作.E-mai:l xhd@i sohu. com
  • 基金资助:

    国家自然基金项目“中国西部地区秋季降水机制研究”(40675066)资助
      

Analysis of an InfrequentContinuousRainW eather Process in Autumn in NorthwestChina

 DI Xiao-Hong1, WANG Xiao-Yong,2 ZHANG Pei-Yan1   

  1. (1.Lanzhou CentralMeteorologicalObservatory, Lanzhou730020, China;2. MeteorologicalScience andTechnology Service Center ofGansu Province, Lanzhou730020, China)
  • Received:2009-04-22 Revised:2009-09-20 Online:2010-12-30 Published:2009-12-30

摘要:

分析了西北地区2007年9月25日至10月14日一次历史罕见秋季连阴雨天气过程的天气气候背景、高低空形势、地面形势及中低层湿度场特征。结果表明:西风带低槽活动和副热带高压位置的异常变化,使得冷空气和南方暖湿气流持续交汇于西北地区是造成这次连阴雨天气过程的主要原因, 100 hPa南亚高压的位置及500 hPaU、V风场急流、0线位置对降水落区有很好的指示。

关键词: 西北地区, 连阴雨, 合成方法, 形势分析

Abstract:

An infrequent continuous rain weather process occurred from September 25 to October 14 in 2007 in northwestChina was studied from theweather and climate background, upper and lower level circulation, surface situation and some physical factors. The results show that frequent activity of thewesterly trough and anomaly of the subtropic high pressure location resulted in this infrequent continuous autumn rain. Moreover, the position ofSouthAsia high at the levelof100 hPa, 500 hPawind field and the position of zero line has some significance for rainfall prediction.

Key words: NorthwestChina, continuous rain, compositivemethod, situation analysis

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