Climatic Features of Spring Precipitation Anomalies in Northeast China in the Past 45 Years

In this paper,the climatic features of the spring(MAM) precipitation anomalies in Northeast China are studied using the monthly precipitation data of 93 stations during 1959—2003.The five climatic divisions for spring precipitation in Northeast China are made by applying the Rotated Empirical Orthogonal Function method.It is found that the interannual change and secular trend of the spring precipitation show obvious regional differences,i.e.a distributive character of the precipitation more in the east and less in the west;the west region is vulnerable to drought/flood,and the precipitation has been slightly increased in the past 45 years;the secular trend and periodical characteristics of the spring precipitation also exhibit regional differences.