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《Plateau Meteorology》 2009-01
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Features of Climate Change of Water Vapor Resource over Eastern Region of the Tibetan Plateau and Its Surroundings

ZHOU Chang-yan1,JIANG Xing-wen1,LI Yue-qing1,WEI Guo-cai2(1.Chengdu Institute of Plateau Meteorology,China Meteorological Administration,Chengdu 610072,China;2.Environmental Assessment Office of the Center of Thunderstorm Preventing in Chengdu,Chengdu 640071,China)  
Based on the monthly reanalysis data provided by the European Center for Medium-range Weather Forecasts(ECMWF),features of climate change of water vapor resource overthe eastern region of the Tibetan Plateau and its surroundingsare studied.The monthly reanalysis data provided by the National Centers for Environmental Prediction(NCEP) and radiosonde data provided by China Meteorological Administration are also used to comparativly analyzed.The main results are as follows: From 1958 to 2001,the regional average of yearly atmospheric precipitable water had been decreased in 44 years,with an average decreasing rate of 3 kg·m-2·(10a)-1.But it is worth noting that there is an obvious increasing trend from the late 1980s.In the four seasons,the regional averaged atmospheric precipitable water had a decline trend,the with a obvious rate of 1 kg·m-2·(10a)-1 in spring and summer,and 0.9 kg·m-2·(10a)-1 in autumn,and the decreasing rate of winter is faint.At same phase,the regional moisture budget also had a evident decreased trend in 44 years,with an average decreasing rate of 6×105kg·(10a)-1.Except for the winter,the regional moisture budgetof which had a faint increase trend in 44 years,the other three seasons′s moisture budget had been decreased.So,in a word,the water vapor resource overthe eastern region of the Tibetan Plateau and its surroundings had a decrease trend from 1958 to 2001.The weakeness of northward and westward march of the water vapor transport with summer monsoon has an important influence on the variation ofwater vapor resource in the region.In comparison with radiosonde data provided by China Meteorological Administration,it is found the results based on the ERA-40 reanalysis data are believable.
【Fund】: 中国气象局气候变化专项(CCSF2007-23);; 四川省气象局课题(重08-05);; 成都高原气象研究所基本业务专项(BROP200702)共同资助
【CateGory Index】: P461.3
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