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《Scientia Meteorologica Sinica》 2009-02
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Spatial-temporal variations of precipitable water over China

Dai Ying Yang Xiuqun(Institute of Severe Weather & Climate,Nanjing University,Nanjing 210093,China)  
The precipitable water(PW) integrated vertically from surface to 300 hPa over China is estimated with monthly data taken from both NCEP/NCAR and ECMWF reanalysis for 1958—2001.The spatial-temporal variations of the PW are examined and some results are compared with those estimated with the radiosonde observations at selected stations.It is shown that the annual mean PW is characterized by a decreasing linear trend over most of China except over northwestern China and the coastal regions of southern China where the PW has an increasing trend.The linear trend of the PW differs from one season to another.Mostly significant linear trend in the PW changes is found during summer when the PW tends to increase over Yangtse river valley,southern and northwestern China and decease over other regions of China.The PW tends to increase during winter but decrease during spring and autumn over most of China.The leading EOF for the detrended PW anomaly exhibits a decadal mode with obvious phase transitions around 1965 when the PW has a decreasing shift and around 1987 when the PW has an increasing shift.The total PW over China has a similar feature.
【Fund】: 公益性行业(气象)科研专项项目(GYHY200706005);; 国家973项目(2004CB418303);; 国家自然科学基金项目(40730953 40425009)
【CateGory Index】: P468.024
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