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中文摘要: 采用ECMWF的格点资料,对1983、1986和1991年夏季华北干旱和长江中下游洪涝事件的特征和物理成因进行了初步分析。发现了两种异常的大尺度位涡型。一种称之“阻塞型"(1986年),另一种称之为“冷涡型"(1983、1991年)。同时指出,干旱期间和洪涝期间两种类型的水汽输送和大气视热源的分布特征有较明显的差异。
中文关键词: 干旱，洪涝，物理成因
Abstract:Based on the ECMWF data in summers of 1983,1986 and 1991,authors diagnostically analyze the features and physical causes of drought events over North China and flood events over the mid-low reaches of the Changjiang River. The results show that two patterns of the potential verticity field exist. One can be called "the blocking pattern"(1986),the other is "cold vortex pattern "(1983 and 1991). In addition,it is obvious that the features of water vapor transport and apparent heat sources of atmosphere vary during the different drought/flood periods.
keywords: drought,flood,physical cause
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基金项目:本工作是国家气象局“八五"重点课题支持的
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引用文本：
李月洪,刘永强,1993.黄河与长江流域近期大旱、大涝成因的初步分析[J].气象,19(5):9-15.
,1993.An Analysis on the Causes of the Typical Drought/Flood over the Valleys of the Yellow and theChangjiang Rivers during the Last Decades[J].Meteor Mon,19(5):9-15.
李月洪,刘永强,1993.黄河与长江流域近期大旱、大涝成因的初步分析[J].气象,19(5):9-15.
,1993.An Analysis on the Causes of the Typical Drought/Flood over the Valleys of the Yellow and theChangjiang Rivers during the Last Decades[J].Meteor Mon,19(5):9-15.