【作者】 邓汗青； 罗勇；

【Author】 DENG Hanqing 1 ,LUO Yong 2 (1 Key Laboratory of Meteorological Disaster of Ministry of Education,Nanjing University of Information Science and Technology,Nanjing ,210044,China;2 Center for Earth System Science,Tsinghua University, Beijing,100084,China)

【机构】 南京信息工程大学气象灾害省部共建教育部重点实验室； 清华大学地球系统科学研究中心；

【摘要】 本文为了更深入揭示珠江流域水资源状况,主要利用珠江流域内1961-2008年48个台站逐日降水资料,探讨了珠江流域年降水时空特征,并对典型年份的气候背景场进行了分析。结论表明珠江流域东部年均降水丰富,西部相对较少,从降水日数上来看流域的东南沿海地区较少,内陆较多,西部一些地区降水量少而日数较多,总体上来看近10年来流域内年降水总量波动较大。进一步讨论了珠江流域典型降水年份中降水事件的差异,发现强降水年的降水量多来着于大雨以上级别的强降水。从全年来看强年有来自于孟加拉湾和南海异常的偏南风水汽输送,流域内并伴随有异常水汽辐合中心,弱年则水汽输送减弱且存在水汽辐散中心。由于年降水总量近80%来自于夏半年(4-9月),登陆到流域内热带气旋偏多也是导致降水增加的原因之一,登陆的热带气旋主要来自于西北太平洋;夏半年中西太平洋副热带高压偏西有利于把海上的水汽送到流域内,弱降则恰好相反。更多还原

【Abstract】 By using the data of daily precipitation data from 48 meteorological stations in the Zhujiang basin during 1961 to 2008, discussed the temporal and spatial characteristics of precipitation and analyzed mechanism in typical years. Analysis showed that precipitation plentiful in the east of basin, but less in the west. In the numbers of precipitation, southeast coast is less than inland and difference of west region is apparent. On the whole,precipitation is changeable in years in recent 10 years. Further discussed the difference of typical rainy years, the heavy typical years caused by heavy rainfall. In heavy precipitation years, Enrich vapor transport from bay of Bengal and South China Sea;The summerly year precipitation made a greater contribution to the yearly precipitation. More tropical cyclone made landfall in the basin and they were more came from the Western Pacific , causing heavy precipitation; The summerly west position of Pacific subtropical high helped to transport water vapor to basin form the Pacific. But contrary to weak years,these were negative.更多还原