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The dependence on atmospheric resolution of ENSO and related East Asian-western North Pacific summer climate variability in a coupled model

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Abstract

The authors present results for El Niño-Southern Oscillation (ENSO) and East Asian-western North Pacific climate variability simulated in a new version high-resolution coupled model (ICM.V2) developed at the Center for Monsoon System Research of the Institute of Atmospheric Physics (CMSR, IAP), Chinese Academy of Sciences. The analyses are based on the last 100-year output of a 1000-year simulation. Results are compared to an earlier version of the same coupled model (ICM.V1), reanalysis, and observations. The two versions of ICM have similar physics but different atmospheric resolution. The simulated climatological mean states show marked improvement over many regions, especially the tropics in ICM.V2 compared to those in ICM.V1. The common bias in the cold tongue has reduced, and the warm biases along the ocean boundaries have improved as well. With improved simulation of ENSO, including its period and strength, the ENSO-related western North Pacific summer climate variability becomes more realistic compared to the observations. The simulated East Asian summer monsoon anomalies in the El Niño decaying summer are substantially more realistic in ICM.V2, which might be related to a better simulation of the Indo-Pacific Ocean capacitor (IPOC) effect and Pacific decadal oscillation (PDO).

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (41425019 and 41661144016) and the Public Science and Technology Research Funds Projects of Ocean (201505013).

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Correspondence to Gang Huang.

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Liu, B., Zhao, G., Huang, G. et al. The dependence on atmospheric resolution of ENSO and related East Asian-western North Pacific summer climate variability in a coupled model. Theor Appl Climatol 133, 1207–1217 (2018). https://doi.org/10.1007/s00704-017-2254-y

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  • DOI: https://doi.org/10.1007/s00704-017-2254-y

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