摘要
将１～３月赤道东太平洋海表水温距平（ＳＳＴＡ）引入大气环流模式，模拟研究了ＥＮＳＯ（厄尔尼诺和拉尼娜）对其后东亚季风活动的影响。结果表明，由于ＳＳＴＡ在大气中强迫激发出了大气低频振荡，使得ＥＮＳＯ对其后的东亚季风活动仍有明显影响。厄尔尼诺之后的夏季，西太平洋副热带高压偏强偏北且西伸明显，中国东部降水偏少，尤其是华北地区；厄尔尼诺之后的冬季，东亚大槽偏深，冬季风偏强。拉尼娜之后的夏季，中国长江下游为异常副热带高压单体控制，江淮流域雨量偏少；拉尼娜之后的冬季，东亚大槽偏弱，东亚冬季风偏弱。厄尔尼诺的影响比拉尼娜的影响略强，两者的影响并非完全反相。
Introducing SSTA in the equatorial eastern Pacific into the GCM during January March, a simulation study about ENSO (El Nino and La Nina) influences on East-Asianmonsoon activities is completed. The results show that the influences of ENSO on the afterward monsoon activities in East Asia are in existance owing to atmospheric low frequency oscillation excited by SSTA. After El Nino event, in the summer, the subtropical high in thewestern Pacific will be stronger and its location will be to north and west, the precipitatoin isless in Eastern China, particularly in Huabei region; In the winter, the aerotrough in EastAsia will be deepening, the winter monsoon will be stronger. After La Nina, in the summer, there is a subtropical high center over the lower reaches of Changjiang River, so thatthe precipitation is less in ChangJiang-Huai River basin; in the winter, the aerotrough willbe weaker, the winter monsoon is weaker. It is also shown that the influence of El Nino isstronger than that of La Nina on the climate and their influences are not the exact opposite.
出处
《气象学报》
CSCD
北大核心
1999年第6期651-661,共11页
Acta Meteorologica Sinica
基金
国家"九五"攀登项目
中国科学院KZ951-B1-408项目
关键词
海表水温距平
东亚季风
数值模拟
厄尔尼诺
季风
Sea surface temperature anormaly (SSTA )
ENSO
East-Asian monsoon
Numerical simulation.
