IMPACTS OF THE TROPICAL PACIFIC COUPLED PROCESS ON THE INTERANNUAL VARIABILITY IN THE INDIAN OCEAN
IMPACTS OF THE TROPICAL PACIFIC COUPLED PROCESS ON THE INTERANNUAL VARIABILITY IN THE INDIAN OCEAN
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DOI：
10.3969/j.issn.1006-8775.2010.03.009
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发表时间：
2010-09
影响因子：
1.2
通讯作者：
Feng Jun-qiao;Bai Xue-zhi
中科院分区：
文献类型：
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作者：
Feng Jun-qiao;Bai Xue-zhi
利用由中间2.5层海洋模式和大气模式ECHAM4构成的耦合大气环流模式（CGCM）分析了热带太平洋和印度洋的气候基本特征和年际变化。 CGCM很好地捕捉了太平洋厄尔尼诺-南方涛动（ENSO）的时空结构以及热带印度洋的变化特征。通过数值实验，仔细研究了太平洋海气耦合过程对印度洋变率的影响。结果表明，正/负印度洋偶极子（IOD）事件的发生频率会随着太平洋耦合过程的存在/不存在而减少/增加。进一步分析表明，太平洋海气耦合过程主要通过调节背景海面风影响温跃层纬向梯度来影响IOD变化。
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 Nino-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.