Variations of Meiyu Indicators in the Yangtze-Huaihe River Basin during 1954-2003
To better understand climate variations of Meiyu, some new indicators for the onset and retreat dates,duration, and Meiyu precipitation in the Yangtze-Huaihe River valley are objectively developed by using observed daily precipitation data from 230 stations in eastern China during 1954-2003.The rainy season onset and retreat dates in each station can be defined in terms of thresholds for rainfall intensity and persistence. Then, the onset and retreat dates of the Meiyu for the Yangtze-Huaihe River basin have been determined when more than 40% of stations reach the first rainy season thresholds in the study region.Based on the indicators of Meiyu in the Yangtze-Huaihe River basin, variations of Meiyu rainfall during 1954-2003 are analyzed. The results suggest that Meiyu rainfall in the Yangtze-Huaihe River basin has increased in recent 50 years. In addition, interannual and interdecadal variability of Meiyu is also obvious.All the indicators display a predominant period of about 3 years.
作 者： ZHANG Yanxia ZHAI Panmao QIAN Yongfu 作者单位： ZHANG Yanxia,QIAN Yongfu(Department of Atmospheric Sciences, Nanjing University, Nanjing 210093)ZHAI Panmao(National Climate Center, Beijing 100081)
刊 名： 气象学报（英文版） SCI 英文刊名： ACTA METEOROLOGICA SINICA 年，卷(期)： 2005 19(4) 分类号： P4 关键词： Yangtze-Huaihe River basin Meiyu interannual and interdecadal variability