The Effect of Regional Ocean-Atmosphere Coupling on the Long-term Variability in the Pacific Ocean  

作　　者：冯琳 吴德星 林霄沛 孟祥凤 

机构地区：[1]Physical Oceanography Laboratory, Ocean University of China

出　　处：《Advances in Atmospheric Sciences》2010年第2期393-402,共10页大气科学进展（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 90411010, 40506007);the key project of International Science and Technology Cooperation program of China (2006DFB21250);the 111 project (B07036)

摘　　要：A fully coupled ocean-atmosphere model is applied to highlight the mechanism of the long-term variability （including decadal and longer time scales） in the Pacific Ocean. We are interested in the effect of ocean-atmosphere coupling of different regions during these processes. The control run successfully simulates the Pacific long-term variability, whose leading modes are the Pacific （inter） Decadal Oscillation （PDO） and the North Pacific mode （NPM）. Furthermore, three numerical experiments are conducted, shutting down the ocean-atmosphere coupling in the North Pacific, the tropical Pacific, and the South Pacific, respectively. The results show that regional ocean-atmosphere coupling is not only important to the strength of local long-term SST variability but also has an influence on the variability further afield. In both the tropical Pacific and North Pacific, this local effect is the main control, which is much more obvious in the tropical regions. The existence of the PDO is extremely dependent on the coupling in the tropical Pacific. However, extratropical coupling, in particular that in the North Pacific, is also important to form its spatial pattern and strengthen the variability in some tropical areas. For the NPM, its existence is primarily determined by the coupling in the North Pacific.A fully coupled ocean-atmosphere model is applied to highlight the mechanism of the long-term variability （including decadal and longer time scales） in the Pacific Ocean. We are interested in the effect of ocean-atmosphere coupling of different regions during these processes. The control run successfully simulates the Pacific long-term variability, whose leading modes are the Pacific （inter） Decadal Oscillation （PDO） and the North Pacific mode （NPM）. Furthermore, three numerical experiments are conducted, shutting down the ocean-atmosphere coupling in the North Pacific, the tropical Pacific, and the South Pacific, respectively. The results show that regional ocean-atmosphere coupling is not only important to the strength of local long-term SST variability but also has an influence on the variability further afield. In both the tropical Pacific and North Pacific, this local effect is the main control, which is much more obvious in the tropical regions. The existence of the PDO is extremely dependent on the coupling in the tropical Pacific. However, extratropical coupling, in particular that in the North Pacific, is also important to form its spatial pattern and strengthen the variability in some tropical areas. For the NPM, its existence is primarily determined by the coupling in the North Pacific.

关 键 词：Pacific Ocean ocean-atmosphere coupling long-term variability PDO 

分 类 号：P461.2[天文地球—大气科学及气象学]