重庆市夏季极端旱涝成因分析  

Genesis Analysis of Summer Flood/Drought Extremes in Chongqing

作　　者：陈欢[1,2] 王式功[1] 李永华[2] 王勇[2] 韩世钢 

机构地区：[1]兰州大学大气科学学院半干旱气候变化教育部重点实验室,兰州730000 [2]重庆市气象局,重庆401147

出　　处：《西南大学学报（自然科学版）》2014年第1期120-128,共9页Journal of Southwest University(Natural Science Edition)

基　　金：国家科技支撑计划资助项目(2007BAC29B03;2009BAC53B02);国家自然科学基金资助项目(40975058);重庆市自然科学基金计划重点资助项目(CSTC;2008BA0022);重庆市气象局科技计划资助项目(zl-200810)

摘　　要：利用1961-2010年重庆34个测站逐月降水量资料、NCEP/NCAR再分析资料以及国家气候中心提供的环流特征量资料,分析了重庆的夏季旱涝特征及其成因.结果表明:重庆地区的夏季极端旱、涝事件具有明显的年际变化特征,在20世纪60年代和70年代总体为偏旱,而在80年代前期偏涝,80年代中后期开始波动加剧,旱涝交替出现,但总体相对偏涝.当夏季西太平洋副高和南亚高压脊线位置偏北(偏南)时,有利于出现重庆地区夏季降水偏少(偏多)的环流形势,同时重庆地区夏季出现干旱(洪涝)还与水汽输送强弱、水汽辐合上升运动和北方冷空气活动的影响有关.The causes of summer flood/drought extremes in Chongqing were analyzed based on the data during 1961--2010 recorded by 34 meterorological stations in Chongqing, NCEP/NCAR reanalysis data and the characteristics of circulation over China provided by NCC （National Climate Center in Beijing）. The results indicated that the summer flood/drought extreme events in Chongqing were characterized by an obvious inter-annual variation. Overall, Chongqing was liable to drought in the 1960＇s and the 1970＇s but to flood in the early 1980＇s. Greater fluctuations occurred in the late 1980＇s, with alternate drought and flooding. When the Western Pacific Subtropical High （WPSH） and the ridge line of the South Asia High shifted northward （southward）, drought （flood） was likely to occur in Chongqing. The flood/ drought also depended on the strength of water vapor transport, the water vapor convergence upward movement and the influence of activities of northern cold air.

关 键 词：重庆 夏季旱涝 西太平洋副热带高压 南亚高压 成因分析 

分 类 号：P467[天文地球—大气科学及气象学]