1880-2006年中国夏季雨带类型的年代际变化特征

 利用1880-2006年中国东部地区夏季降水量及1951-2006年中国160个站夏季降水量和北半球大气环流资料，在夏季降水分型的基础上，研究了夏季雨型的年代际变化规律，分析了夏季各类雨型所对应的北半球500 hPa环流场的主要特征。结果表明：东部季风区和西部区存在着20～40 a左右的年代际振荡趋势，东北区则表现为明显的15 a左右的年代际变化特点；东部季风区四类雨型东亚大气环流差异显著，西部区二类雨型和东北区二类雨型欧亚大气环流的配置基本都相反。

Decadal Variation of Summer Rain-Pattern in China During 1880-2006

Based on the summer precipitation data in eastern China during 1880-2006 and at 160 stations in China during 1951-2006, and 500 hPa geopotential height data in the North Hemisphere during 1951-2006, the decadal variation law of summer rain-pattern was explored. The results show that there existed obvious 20-to 40-year period in the eastern monsoon region and the western region, and about 15-year period in the northeastern region of China. Additionally, the main features of geopotential heights at 500 hPa in the Northern Hemisphere for different summer rain-patterns were analyzed. Results show obvious differences of East Asian circulation for four rain-patterns in the eastern monsoon region, and the basically opposite allocation of Eurasia circulation pattern between the two rain-patterns in the western region and the two rain-patterns in the northeastern China.