Volume 41 Issue 10
Oct.  2022
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Baosheng Li, Dake Chen, Tao Lian, Jianhuang Qin. Comparison of coupled and uncoupled models in simulating Monsoon Intraseasonal Oscillation from CMIP6[J]. Acta Oceanologica Sinica, 2022, 41(10): 100-108. doi: 10.1007/s13131-022-2011-7
Citation: Baosheng Li, Dake Chen, Tao Lian, Jianhuang Qin. Comparison of coupled and uncoupled models in simulating Monsoon Intraseasonal Oscillation from CMIP6[J]. Acta Oceanologica Sinica, 2022, 41(10): 100-108. doi: 10.1007/s13131-022-2011-7

Comparison of coupled and uncoupled models in simulating Monsoon Intraseasonal Oscillation from CMIP6

doi: 10.1007/s13131-022-2011-7
Funds:  The Zhejiang Provincial Natural Science Foundation of China under contract No. LR19D060001; the Scientific Research Fund of the Second Institute of Oceanography, Ministry of Natural Resources, under contract No. JB2206; the China Postdoctoral Science Foundation under contract Nos 2022M711010 and 2021M703792; the National Natural Science Foundation of China under contract No. 42106003.
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  • Corresponding author: Corresponding E-mail: dchen@sio.org.cn
  • Received Date: 2022-01-23
  • Accepted Date: 2022-02-25
  • Available Online: 2022-07-06
  • Publish Date: 2022-10-27
  • The monsoon intraseasonal oscillation (MISO) is the dominant variability over the Indian Ocean during the Indian summer monsoon (ISM) season and is characterized by pronounced northward propagation. Previous studies have shown that general circulation models (GCMs) still have difficulty in simulating the northward-propagating MISO, and that the role of air-sea interaction in MISO is unclear. In this study, 14 atmosphere-ocean coupled GCMs (CGCMs) and the corresponding atmosphere-only GCMs (AGCMs) are selected from Phase 6 of the Coupled Model Intercomparison Project (CMIP6) to assess their performance in reproducing MISO and the associated vortex tilting mechanism. The results show that both CGCMs and AGCMs are able to well simulate the significant relationship between MISO and vortex tilting. However, 80% of CGCMs show better simulation skills for MISO than AGCMs in CMIP6. In AGCMs, the poor model fidelity in MISO is due to the failure simulation of vortex tilting. Moreover, it is found that failure to simulate the downward motion to the north of convection is responsible for the poor simulation of vortex tilting in AGCMs. In addition, it is observed that there is a significant relationship between the simulated sea surface temperature gradient and simulated vertical velocity shear in the meridional direction. These findings indicate that air-sea interaction may play a vital role in simulating vertical motions in tilting and MISO processes. This work offers us a specific target to improve the MISO simulation and further studies are needed to elucidate the physical processes of this air-sea interaction coupling with vortex tilting.
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