近50年中国降水序列均一性检验与订正研究

Study of Precipitation Series Homogeneous Adjustment and Their Correction over China in the Last 50 Years

选取中国近50年（1951-2004年）月降水资料中具有连续观测20年以上记录的681个台站资料，通过对各站年代际分量的EOF分析及North判别检验，结合标准正态检验（SNHT）方法，发现所检站点中约有4％的台站降水序列存在非均一性。利用比值法对非均一降水序列进行了订正，结果表明对年降水序列的订正量在-3％～7％之间。必须注意的是，由于我国现有台站观测网的密度不够，影响了对非均一降水序列的订正精度。

Applying EOF analysis and North test and standard normal homogeneity test （SNHT） to monthly precipitation data of 681 stations, which are recorded in at least 20 years of the last 50 years （1951-2004）, we find that 4% stations records have inhomogeneity. Through ratio correction, the inhomogeneity in annual precipitation time series is corrected with in about -3%-7% . It should be noticed that the density of the stations observation net now is too small to detect the precipitation data inhomogeneity and more stations are needed.