IMPACTS OF THE TROPICAL PACIFIC COUPLED PROCESS ON THE INTERANNUAL VARIABILITY IN THE INDIAN OCEAN |
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| Authors: | FENG Jun-qiao and BAI Xue-zhi |
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| Institution: | Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071 China;Key Laboratory of Ocean Circulation and Waves,Chinese Academy of Sciences,Qingdao 266071 China |
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| Abstract: | The basic features of climatology and interannual variations of tropical Pacific and Indian Oceans were analyzed using a coupled general circulation model (CGCM),which was constituted with an intermediate 2.5-layer ocean model and atmosphere model ECHAM4.The CGCM well captures the spatial and temporal structure of the Pacific El Ni?o-Southern Oscillation (ENSO) and the variability features in the tropical Indian Ocean.The influence of Pacific air-sea coupled process on the Indian Ocean variability was investigated carefully by conducting numerical experiments.Results show that the occurrence frequency of positive/negative Indian Ocean Dipole (IOD) event will decrease/increase with the presence/absence of the coupled process in the Pacific Ocean.Further analysis demonstrated that the air-sea coupled process in the Pacific Ocean affects the IOD variability mainly by influencing the zonal gradient of thermocline via modulating the background sea surface wind. |
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| Keywords: | coupled GCM IOD tropical Pacific Ocean ENSO |
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