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The characteristics of spatio-temporal patterns in precipitation in China under the background of global climate change

WANG Ying~(1,2),CAO Ming-kui~1,TAO Bo~1,LI Ke-rang~1(1.Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;2.The Department of Geoscience,Zhejiang University,Hangzhou,Zhejiang 310027,China)  
Under the background of global climate change,there are even greater uncertainties of the precipitation changing trend and regional differences.Therefore,it is one of the most important frontier fields of presently global change research to study the changing characteristics of precipitation in different regions.In this study,we analyzed the spatio-temporal patterns of precipitation in China during 1951 to 2002 by using spatial spline interpolation method and Mann-Kendall trend test,also with the support of GIS,based on measurements at about 730 meteorological stations nationally.The results showed that there was an obvious decreasing trend from the 1960s to the 1990s in China,and a recovery occurred in the late 1990s,while in summer and winter precipitation was comparable with that in the 1950s and the 1960s. Furthermore,results showed that precipitation presented clear regional spatial differences in the analyzed period: In North China,Central China,and southern Northeast China,precipitation reduced persistently in the period we studied,while sharp increase occurred in the south of the Yangtze Valley,and in northern Xinjiang,northern Northeast China,and western Tibet,precipitation decreased from the 1960s to the 1970s,and had a relative recovery in the 1980s.While climate in northern China appeared to have a sign of turning from dry to wet,and North China,Northeast China Plain still have been at the stage of drying which began since the mid 1960s.On the whole,the total declining trend of precipitation in China was comparable with that of global in the analyzed period,but regional variation patterns were opposite from global that precipitation increased obviously in the middle and high latitude regions,and decreased in the tropical and semi-tropical regions.
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