我国夏季降水类型初探

[目的]为研究我国夏季降水的空间分布类型及年际和年代际变化特点。[方法]利用经验正交函数分析,对1951~2000年我国160个观测站夏季降水量资料的标准场进行展开,得到我国夏季降水空间分布的不同类型,分析我国夏季降水的年际变化和年代际变化特点。[结果]我国夏季降水主要分布在东部;第一、二、三种EOF模态的空间型特别显著,与其他学者分析我国夏季降水距平百分率分布图得出的我国夏季降水3类雨型比较吻合;我国夏季降水不仅具有比较明显的年际变化,还具有年代际变化。[结论]该研究可为我国夏季降水类型的后续研究提供基础资料。

Preliminary Studies on Summer Precipitation Patterns in China

[Objective] Study on the spatial distribution of summer precipitation patterns and interannual and interdecadal variability.[Method] The summer precipitation patterns were obtained from standard field of summer precipitation data for 160 observation stations in China during 1951-2000 by the utilization of empirical orthogonal function(EOF),and characteristics of interannual and interdecadal variability were analyzed.[Result] The summer precipitation mainly distributes in eastern part of China;The 1st,2nd and 3rd EOF modes of spatial distribution are especially remarkable as well consistent with the results of previous reports about three rainfall patterns from analysis on the percentages of precipitation anomaly of summer.[Conclusion] There exists interannual and interdecadal variability for summer precipitation in China.