摘要
利用1951—2001年东北地区9站旬平均降水量资料划分了东北雨季,确定了雨季开始旬序、结束旬序、持续期和降水量,分析了雨季各特征量之间的关系,探讨了雨季前后大气流场的差异,研究了雨季特征量与热带海温指数的关系。结果表明:(1)东北雨季平均在7月中上旬开始,8月中上旬结束;51 a雨季降水量与9站夏季Z指数密切相关,表明了雨季降水基本反映了该地区夏季降水的特征;(2)一般说来,雨季开始早,则持续期长,降水量大,反之亦然;(3)东北雨季主要受东亚夏季风的控制,季风增强北进,雨季开始,季风减弱南撤,雨季结束;(4)东北雨季特征量有短期气候预测时间尺度上的热带季节海表温度距平前兆信号。
Based on the 1951-2001 dekad mean rainfall of 9 stations in northeast China, northeast China rainy season is demarcated. The initiation, termination, duration and rainfall of rainy season are determined and the relationships among these characteristic quantities discussed. The atmosphe.ric circulation variations at the beginning and end of rainy season are compared. And the lag correlation between rainy season characteristic quantity and SST anomaly in tropical ocean key regions is investigated. Results show that： （1） the rainy season begins in the first-second dekad of July, and ends in the first-second dekad of August, and the rainy season rainfall is closely related to the Z index of the total rainfall of 9 stations in summer,indicating that the rainy season rainfall reasonably reflects the summer precipitation features of the region;（2） generally speaking, when the rainy season begins earlier, it always persists for a longer period, and its rainfall is greater, and when the rainy season begins later, the inverse is also true ; （3） the northeast China rainy season is principally controlled by the East Asian summer monsoon：when the East Asian summer monsoon strengthens and marches northward, the rainy season begins, and when the East Asian summer monsoon weakens and withdraws southward, the rainy season terminates;and （4） the seasonal SSTA over the tropical ocean is a precursor on the scale of short-range climate prediction to the rainy season features in northeast China.
出处
《南京气象学院学报》
CSCD
北大核心
2006年第2期203-208,共6页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金资助项目(402750144033101040405010)
关键词
东北雨季
东亚夏季风
区域气候
northeast China rainy season
East Asian summer monsoon
regional climate
