中国1月份降水异常与司期里海低涡强弱的关系

利用中国气象局国家气象信息中心提供的1951年-2008年中国160站月平均降水、气温资料，美国提供的NCEP／NCAR再分析月平均资料，运用EOF分解的方法定义了一个里海低涡指数。应用相关系数检验的方法统计分析了1月份指数与160站降水量相关系数分布，发现1月份里海低涡指数与全国大部分地区的降水量成正相关。本文还运用合成分析的方法简单的分析了这种相关关系的原因，发现里海低涡活跃的年份，同期的大气环流、风场和垂直运动都有利于中国的降水。

The Relationship between Abnormal Precipitation in January in China and the Caspian Vortex

Based on monthly average precipitation and temperature data of 160 weather station from 1951 to 2008 which is provided by National Meteorol was defined using EOF. The statistics and oglc anal al Information Center and NCEP/NCAR data, A Caspian vortex index ysis of the correlation coefficient were done between Caspian vortex index and precipitation of 160 stations in January by correlation coefficient test. The Caspian vortex index in January has a positive correlation with the precipitation of most of the country. The reason of the correlation was analyzed using the method of synthetic analysis. It showed that the atmospheric circulation, wind and vertical motion were conducive to the precipitation of China in the active years of the Caspian vortex.