| The Subsurface and Surface Indian Ocean Dipoles and Their Association with ENSO in CMIP6 models |
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| 作者姓名： | Ge SONG Rongcai REN |
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| 作者单位： | 1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG),Institute of Atmospheric Physics, Chinese Academy of Sciences;2. University of Chinese Academy of Sciences;3. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD),Nanjing University of Information Science & Technology |
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| 基金项目： | supported by the National Key R&D Program of China (Grant No. 2019YFA0606701)；;the Guangdong Major Project of Basic and Applied Basic Research (Grant No. 2020B0301030004)； |
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| 摘 要： | This study assesses the reproducibility of 31 historical simulations from 1850 to 2014 in the Coupled Model Intercomparison Project phase 6(CMIP6) for the subsurface(Sub-IOD) and surface Indian Ocean Dipole(IOD) and their association with El Ni?o-Southern Oscillation(ENSO). Most CMIP6 models can reproduce the leading east-west dipole oscillation mode of heat content anomalies in the tropical Indian Ocean(TIO) but largely overestimate the amplitude and the dominant period of the Sub-IOD. Associat...
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The Subsurface and Surface Indian Ocean Dipoles and Their Association with ENSO in CMIP6 models |
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| Ge SONG,Rongcai REN.The Subsurface and Surface Indian Ocean Dipoles and Their Association with ENSO in CMIP6 models[J].Advances in Atmospheric Sciences,2023,40(6):975-987. |
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| Authors: | Ge SONG Rongcai REN |
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| Abstract: | This study assesses the reproducibility of 31 historical simulations from 1850 to 2014 in the Coupled Model Inter-comparison Project phase 6 (CMIP6) for the subsurface (Sub-IOD) and surface Indian Ocean Dipole (IOD) and their association with El Ni?o-Southern Oscillation (ENSO). Most CMIP6 models can reproduce the leading east-west dipole oscillation mode of heat content anomalies in the tropical Indian Ocean (TIO) but largely overestimate the amplitude and the dominant period of the Sub-IOD. Associated with the much steeper west-to-east thermocline tilt of the TIO, the vertical coupling between the Sub-IOD and IOD is overly strong in most CMIP6 models compared to that in the Ocean Reanalysis System 4 (ORAS4). Related to this, most models also show a much tighter association of Sub-IOD and IOD events with the canonical ENSO than observations. This explains the more (less) regular Sub-IOD and IOD events in autumn in those models with stronger (weaker) surface-subsurface coupling in TIO. Though all model simulations feature a consistently low bias regarding the percentage of the winter–spring Sub-IOD events co-occurring with a Central Pacific (CP) ENSO, the linkage between a westward-centered CP-ENSO and the Sub-IOD that occurs in winter–spring, independent of the IOD, is well reproduced. |
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| Keywords: | CMIP6 subsurface Indian Ocean Dipole surface Indian Ocean Dipole El Ni?o-Southern Oscillation |
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