J4 ›› 2008, Vol. 25 ›› Issue (1): 58-62.

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Analysis of Isentropic Potential Vorticity of a Continuous Rain Process in the East of Northwest China

CHENG Peng1, ZHAO Qingyun 1,LI Jiangping 2,SUN Guowu3   

  1. 1.Lanzhou Central Meteorological Observatory,Lanzhou 730020,China;2.College ofAtmospheric Sciences,Lanzhou University,Lanzhou 730000,China;3.Institute ofArid Meteorology,CMA,Lanzhou 730020,China
  • Received:2006-09-23 Revised:2007-01-11 Online:2007-03-31 Published:2007-03-31



  1. 1.兰州中心气象台,甘肃兰州730020;2.兰州大学大气科学学院,甘肃兰州730000;3.中国气象局兰州干旱气象研究所,甘肃兰州730020
  • 作者简介:程鹏(1981一),男,甘肃I临泽人,助理工程师,主要从事中短期天气预报工作
  • 基金资助:



Based on the theory of isentropic potential vorticity(IPV),a diagnostic analysis of a continuous rain process in the east of  Northwest China in the second ten—day of May in 2005 WaS carried out.The results show that the large circulation background which influenced this continuous rain process was the h Jigh ridge near the Ural Mountain and the continually deepening trough near the Balkhash Lake;this continuous rain process Was caused by the low vortex continually created from the plateau together with the cold air split from the north.Because of the topographic effect of the Tibetan Plateau,the hi sh potential vorticity O11 the isentropic surface was transported to the lower reaches along the north side of the plateau;the high value area of IPV Was closely associated with the precipita·tion area。and the positive value area of IPV Can reflect the movement of the cold air,thus it Call be a significant predictor.

Key words: continuous rain, isentropic potential vorticity, the east of Northwest China



关键词: 连阴雨, 等熵位涡, 西北地区东部

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