Differences between dynamics factors for interannual and decadal variations of rainfall over the Yangtze River valley during flood seasons

查看全文 作　　者：PING [1,2]Fan;LUO [2]Zhexian;JU [3]Jianhua 机构地区：[1]Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;[2]Nanjing University of Information Science & Technology, Nanjing 210044, China;[3]China Meteorological Administration Training Center, Beijing 100081, China 出　　处：《Chinese Science Bulletin》索引2006年第51卷第8期,共6页 基　　金：supported by the National Natural Science Foundation of China(Grant Nos.40333028 and 40305010);the National Key Basic Research Project(Grant No.2004CB418302). 摘　　要：The rainfall over the Yangtze River val- ley during flood seasons (June to July) shows both interannual and decadal variations. The rainfall has been increasing since 1990, showing a decadal sig- nal. The variations of rainfall are influenced by the multi-scale interactions in the atmosphere-ocean coupled climate system. The rainfall, SST, and cir- culation are analyzed with the Chinese 160 station data, and other observational/reanalysis data, re- spectively. The separation between the interannual and decadal variations is carried out. The key areas affecting the Yangtze rainfall are the western Pacific warm pool on the interannual time scale and the EINO3 area on the decadal time scale, respectively. The circulation anomaly associated with the interan- nual variation occurs in the upper troposphere whereas that associated with the decadal variation appears in the lower troposphere. 关 键 词：长江流域 降雨量 动力学因素 比较分析