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Characteristics of Water Vapor Transport and Atmospheric Circulation for Precipitation over the Source Regions of the Yellow and Yangtze Rivers

WANG Ke-li, CHENG Guo-dong, DING Yong-jian, SHEN Yong-ping, JIANG Hao(Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China)  
On the basic of weather station precipitation data and NCEP/NCAR reanalysis data,interannual change of precipitation over the source regions of the Yellow River and the Yangtze River are respectively analyzed.Composite characteristics of the geopotential height and wind field on 500 hPa,the flow field on 600 hPa,the atmospheric water vapor content and water vapor transport for the typical rainiest and rainless years over the source regions of the Yellow River and the Yangtze River are respectively analyzed and compared.The results show that,the long-term change trend of the precipitations over the source regions of the Yellow River and the Yangtze River are not clear during the last 50 years but obvious decreased over the source regions of the Yellow River and increased over the source regions of the Yangtze River during the last 10 years.There are obvious circulation difference characteristics between rainiest and rainless years.In the rainiest/rainless year,the Mongol low pressure on 500 hPa is weaker/stronger and so the westerly speed is weaker/stronger,the Plateau convergence line on 600 hPa moves north /south,the water vapor content over the river source regions increases/decreases,the water vapor transport from south by the southwest monsoon increases/decreases and make more/less water vapor source to the river source regions and so make more/less precipitation.There are similar atmospheric circulation difference characteristics between the source regions of the Yellow River and the Yangtze River for rainiest and rainless years but the circulation difference degree is stronger over the source regions of the Yellow River than over the source regions of the Yangtze River.
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