Interdecadal modulation of ENSO teleconnections to the Indian Ocean Basin Mode and their relationship under global warming in CMIP5 models
Interdecadal modulation of ENSO teleconnections to the Indian Ocean Basin Mode and their relationship under global warming in CMIP5 models
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DOI：
10.1002/joc.3987
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
W. Tao;G. Huang;Kaiming Hu;X. Qu;G. Wen;H. Gong
中科院分区：
文献类型：
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作者：
W. Tao;G. Huang;Kaiming Hu;X. Qu;G. Wen;H. Gong
基于第五阶段耦合模式比对项目（CMIP5）模式，研究了模式对El Niño/南方涛动(ENSO) -印度洋盆地模态（IOBM）关系的捕捉能力，探讨了ENSO - IOBM关系的年代际变化特征以及ENSO - IOBM关系对全球变暖的响应。在23个CMIP5模式中，模式对IOBM的表征能力在很大程度上取决于对ENSO的模拟。此外，有一半的模型可以再现不稳定的ENSO-IOBM关系。考虑ENSO、ENSO - iobm关系和年代际变化的模拟，从23个CMIP5模式中选择6个模式进行进一步研究。ENSO - iobm关系的年代际变化与三个ENSO相关过程有关。在高相关（HC）期，对流层温度机制、海洋罗斯比波和反对称风型强，延长了IOBM的持续时间。相比之下，在低相关（LC）期间，这三个过程都很弱。结果表明，西南印度洋浅层温跃层、ENSO年际变率的增加和周期的延长都是造成年代际变化的原因。
On the basis of Coupled Model Intercomparison Project phase 5 (CMIP5) models, this study have examined the ability of models to capture the El Niño/Southern Oscillation (ENSO)–Indian Ocean Basin Mode (IOBM) relationship, and investigated the characteristics of interdecadal change of ENSO–IOBM relationship as well as the response of the ENSO–IOBM relationship to the global warming. Among 23 CMIP5 models, the capability of models in representing the IOBM depends largely on the simulation of ENSO. Moreover, half of the models can reproduce the unstable ENSO–IOBM relationship. Considering the simulations of ENSO, ENSO–IOBM relationship and interdecadal change, 6 of 23 CMIP5 models are chosen for further investigation. The interdecadal change of ENSO–IOBM relationship is relative to the three ENSO‐related processes. During the high correlation (HC) period, the tropospheric temperature (TT) mechanism, oceanic Rossby waves and antisymmetric wind pattern are strong, prolonging the persistence of IOBM. In comparison, during the low correlation (LC) period, the three processes are weak. The results show that the shallow thermocline in the southwestern Indian Ocean (SWIO), increased interannual variability and prolonged periodicity of ENSO are all responsible for the interdecadal change.