太平洋SSTA对中国东部夏季降水的影响Ⅰ——观测分析  

THE EFFECTS OF PACIFIC SSTA ON SUMMER PRECIPITATION OVER EASTERN CHINA I——OBSERVATIONAL ANALYSIS

作　　者：余贞寿[1] 孙照渤[1] 曾刚[1] 

机构地区：[1]南京信息工程大学/气象灾害与环境变化重点实验室

出　　处：《热带气象学报》2005年第5期467-477,共11页Journal of Tropical Meteorology

基　　金：国家自然科学基金重点项目(40331010)资助

摘　　要：采用旋转经验正交函数(REOF)方法对1901～2000年中国东部43个站夏季降水资料进行分析,得到:华南、西南地区和长江中下游地区及华北北部、东北西南部地区是中国东部夏季降水异常三个最主要的区域,对三个主要模态对应的时间系数序列与太平洋SSTA作相关分析,结果表明影响东部夏季降水的关键海区是:前期冬季西北太平洋黑潮海区、前期春季赤道中东太平洋和同期北太平洋中纬中太平洋海区;并对关键海区SSTA与东部120个站夏季降水作SVD分析,进一步证实:这三个关键海区SSTA与东部夏季降水有显著的耦合相关关系。另外,对三个主要降水异常区的夏季降水异常的极端年份500 hPa高度场进行合成分析,其结果为数值模拟分析提供依据。With the methods of REOF, the summer precipitation from 43 stations over Eastern China for the periods 1901-2000 is examined. The results show that South China and Southwest China, the middle and lower reaches of Yangtze river, North China and the Southwestern of Northeast China are three main areas of summer rainfall anomaly. Furthermore, correlation analysis is applied to three time series of three mostly summer rainfall modes and four seasonal Pacific SSTA, and the results suggest that Pacific SSTA which notably cause the summer rainfall anomaly over eastern China are the preceding winter SSTA over the kuroshio region of Northwest Pacific, preceding spring SSTA in the middle and eastern equatorial Pacific and current summer SSTA of the center region of middle latitude. The relationship between summer precipitation over Eastern China and SSTA of Pacific key regions is further verified by SVD analysis. The synthesizing analysis was used to analyze the features of atmospheric general circulation in years of positive and negative precipitation anomaly. Its results were used to provide as the base of numerical simulation analysis.

关 键 词：中国东部 夏季降水 太平洋 SSTA 夏季降水异常 西北太平洋 观测分析 500hPa高度场 长江中下游地区 经验正交函数 

分 类 号：P426.616[天文地球—大气科学及气象学] P444