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Cite this paper: |
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Yun Liang, Yan Du, Shang-Ping Xie. SST effect on the pre-monsoon intraseasonal oscillation over the South China Sea based on atmospheric-coupled GCM comparison[J]. Journal of Oceanology and Limnology, 2023, 41(2): 409-417 |
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SST effect on the pre-monsoon intraseasonal oscillation over the South China Sea based on atmospheric-coupled GCM comparison |
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| Yun Liang1,2,3, Yan Du1,2,4, Shang-Ping Xie5 |
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1. State Key Laboratory of Tropical Oceanography & Key Laboratory of Science and Technology on Operational Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences & Innovation Academy of South China Sea Ecology and Environmental Engineering, Guangzhou, 510301, China;
2. College of Marine Science, University of Chinese Academy of Sciences, Beijing, 100049, China;
3. Peking University Chongqing Research Institute of Big Data, Chongqing, 401332, China;
4. Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou, 510301, China;
5. Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, 92093, USA |
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| Abstract: |
| The role of sea surface temperature (SST) variability in the pre-monsoonal (April to July) intraseasonal oscillation (ISO) over the South China Sea (SCS) is investigated using the Community Earth System Model Version 2 (CESM2). An Atmospheric Model Intercomparison Project (AMIP) simulation forced by daily sea surface temperatures (SSTs) derived from a parallel coupled general circulation model (CGCM) run was compared with observations and the mother coupled simulation. In the coupled model, the SST warming leads the peak convection about 1/4 period as in observations. The paralell uncoupled model fails to simulate this phase relationship, implying the importance of air-sea coupling in reproducing realistic ISO. Due to the near-quadrature phase relationship between SST and precipitation ISOs during the ISO events, it is difficult to distinguish the active/passive role of SST from observations alone. Significant correlation in intraseasonal precipitation between the daily SST-forced AMIP and mother CGCM runs indicates that SST plays a role in driving the atmospheric ISO. |
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| Key words:
intraseasonal variability|South China Sea|Community Earth System Model Version 2 (CESM2)|sea surface temperature
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| Received: 2021-12-20 Revised: |
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