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Temporal Variation and Spatial Structure of the Water Vapor Transport and Budget over the Heihe Drainage Area

JIANG Hao,WANG Ke-li,CHENG Guo-dong,LI Hai-yan,YU Tao(Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China)  
Based on the NCEP/ NCAR re-analysis climate data,with the resolution of 2.5°×2.5° and 1°×1°,the temporal variation and spatial structure of atmospheric water vapor transport and budget over the Heihe drainage area are analyzed.It is found that,in the monthly variation of the water vapor transportation,the main effect factor is water vapor content,the primary process is concentrated in June to September,and the strong transportation is in the layer of 700~500 hPa.In the annual variation of the water vapor transportation,there is a decreasing trend with two obvious turning points at 1960′s and 1970's,respectively,the wind speed is the main factor and water vapor content decreasing provides a background of the variation.The strong transportation is still in the layer of 700~500 hPa.Spatial structure of the water vapor transportation is mainly dominated by air current distribution.The climatic characteristics are as follow: there is a convergence from south and north in the layer from surface to 700 hPa,a westerly wind convergence in the layer of 700~500 hPa,and a westerly wind divergence in the layer of 500~300 hPa.In the Heihe drainage area with an area of 2°×5°,from June to September,influent water vapor amount is about 2484×108m3,effluent water vapor amount is about 2196×108m3,with an net water vapor amount of about 288×108m3.
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