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Climate Dynamics

, Volume 52, Issue 5–6, pp 2631–2646 | Cite as

An investigation of CMIP5 model biases in simulating the impacts of central Pacific El Niño on the East Asian summer monsoon

  • Juan FengEmail author
  • Wen Chen
  • Hainan Gong
  • Jun Ying
  • Wenping Jiang
Article

Abstract

The delayed impacts of the central Pacific (CP) El Niño on the East Asian summer monsoon (EASM) are evaluated by comparing historical runs from Coupled Model Intercomparison Project Phase 5 models against reanalysis data. In observations, an anomalous western North Pacific anticyclone (WNPAC), linking CP El Niño to the EASM, forms due to the transition of sea surface temperature (SST) warming into SST cooling over the CP, which generates a WNPAC through a Gill–Matsuno response. In comparison with the observational result, only one-third of the models (i.e., the type-I models) capture a weaker and smaller WNPAC, whereas the other two-thirds (i.e., the type-II models) fail to reproduce a WNPAC. The simulation biases in both of type-I models and type-II models mainly arise from an unrealistic, long-lasting CP El Niño warming, which causes a north Indian Ocean SST warming bias in models through air–sea interaction process. This north Indian Ocean SST warming generates the WNPAC through capacitor effects, which is different from the WNPAC formation mechanism in observations. This discrepancy leads to simulation biases in type-I models. In type-II models, the unrealistic CP El Niño warming persists into summer, which produces an anomalous cyclone over the central-western Pacific. The opposite effect of the CP and north Indian Ocean SST warming on the WNP atmospheric circulation leads to disappearance of the WNPAC. Hence, large simulation biases are produced in type-II models. Further analysis demonstrates the slow decay of CP El Niño is caused by the unrealistically simulated climatological SST, which creates strong warm meridional oceanic advection and results in a sustained CP El Niño warming.

Keywords

Central Pacific El Niño East Asian summer monsoon CMIP5 models Western North Pacific anticyclone Simulation bias 

Notes

Acknowledgements

This study was supported jointly by the National Key Research and Development Program (Grant No. 2016YFA0600604) and the National Natural Science Foundation of China (Grant Nos. 41675091 and 41230527).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Juan Feng
    • 1
    Email author
  • Wen Chen
    • 1
  • Hainan Gong
    • 1
  • Jun Ying
    • 2
  • Wenping Jiang
    • 3
    • 4
  1. 1.Center for Monsoon System Research, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of OceanographyState Oceanic AdministrationHangzhouChina
  3. 3.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  4. 4.University of Chinese Academy of SciencesBeijingChina

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