中国东部夏季降水特征及其与西太平洋副高的关系

利用中国东部160个气象观测站1951年-2012年夏季（6-8月）的月平均降水资料，运用EOF分析方法，分析中国东部夏季降水的时空分布特征及其与西太平洋副热带高压的关系。结果表明:（1)夏季，中国东部降水大值区域从华南移到江淮流域，然后到达华北和东北地区。（2) 中国东部夏季降水EOF第一模态空间分布为长江以北与黄河以南地区之间存在一个降水大值雨带， EOF第二模态显示出整个东部沿海地区的降水量以长江为界，长江以南降水偏少，长江以北降水偏多，且江南与江北的降水呈反位相。（3)在西太平洋副热带高压较强的年份，江淮流域降水偏少，华北地区降水偏多；西太平洋副热带高压较弱的年份，江淮流域降水偏多，华南地区降水偏少。

The Characteristics of Summer Precipitation in Eastern China and its Relationship with the WPSH

Using the 160 weather stations of the Summer (June-August) monthly precipitation data during 1951 to 2012 ,and EOF analysis with summer rainfall in eastern China temporal and spatial distribution of precipitation and the subtropical high through the synthesis analysis diagram analysis of the rain belt summer monsoon rainfall distribution type and its relationship with the West Pacific subtropical high .The results showed that: 1) in June - August, the rain belt in eastern China were moved from the Yellow River Valley in southern China, Jianghuai region in rainy season, to the north and northeast regions.2) Rainfall in East China EOF analysis of the spatial distribution of the first mode is the area south of the Yangtze River and the Yellow River north of present rain band, and there is a quasi 3 - 5 years and a quasi-periodic oscillation of the oscillation period of seven years. From the second mode EOF analysis can be seen in the entire eastern coast of the Yangtze River as the boundary precipitation, south of the Yangtze rainfall throughout the southern region, the area north of the Yangtze River above normal precipitation. Jiangnan and Jiangbei anti-phase precipitation was changed.3) research and analysis through eastern China in summer (June to August) precipitation rain belt, eastern China summer rainfall distribution and rain belt WPSH relationship links between each other to get their order right summer precipitation rain belts the projections indicate an important role, which for our short-term climate prediction, disaster prevention and reduction, etc. with great significance and impact.