ENSO and Indian Ocean dipole mode in three coupled GCMs
ENSO and Indian Ocean dipole mode in three coupled GCMs
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DOI：
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发表时间：
2004
影响因子：
1.4
通讯作者：
Yongqiang Yu;Xiying Liu
中科院分区：
文献类型：
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作者：
Yongqiang Yu;Xiying Liu
比较了三个具有相同海洋分量模式CPMO、CPM1和FGCMO的耦合模式所模拟的ENSO和印度洋偶极子(IOD)模事件。CPMO和CPM1的唯一区别在于海-气界面的耦合方案，如前者的通量异常耦合方案和后者的直接耦合方案。PGCM0也是一个直接耦合的GCM，但它的大气成分模式是NCAR CCM3，而不是另外两个耦合的GCM CPMO和CPM1中的NCC T63AGCM。3个耦合模式在热带太平洋都表现出类似厄尔尼诺现象的年际变化，但FGCMO表现出较强的厄尔尼诺事件的幅度，而CPMO和CPM1的幅度都比观测到的弱得多。同时，准两年变率在FGCMO模式中占主导地位，在CPM0和CPM1模式中，4a和更长的周期都是显著的。作为三个耦合模式模拟的厄尔尼诺事件，耦合模式FGCMO模拟的印度洋偶极子模事件较强，而CPMO和CPM1模式模拟的印度洋偶极子模事件比观测模式弱。
The simulated ENSO and Indian Ocean dipole (IOD) mode events from three coupled GCMs with the same oceanic component model, CPMO, CPM1 and FGCMO, are compared. The only difference between the CPMO and the CPM1 comes from the coupling scheme at the air-sea interface, e.g., flux anomaly coupling scheme for the former and direct coupling scheme for the latter. The PGCM0 is also a directly coupled GCM, but its atmospheric component model is the NCAR CCM3 rather than the NCC T63AGCM as in the other two coupled GCMs CPMO and CPM1. All three coupled models show El Nino-like interannual variability in the tropic Pacific, but the FGCMO shows a bit stronger amplitude of El Nino events and both the CPMO and the CPM1 show much weaker amplitude than the observed one. In the meanwhile, the quasi-biennial variability dominates in the FGCMO simulations, and 4 a and longer periods are significant in both the CPM0 and CPM1 models. As the El Nino events simulated by the three coupled GCMs, the simulated Indian Ocean dipole mode events are stronger from the coupled model FGCMO and weaker from both the CPMO and CPM 1 models than those from observation.