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Impact of local sea surface temperature anomaly over the western North Pacific on extreme East Asian summer monsoon

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Abstract

In this study, the anomalous characteristics of observed large-scale synoptic fields in the extreme East Asian summer monsoon (EASM) years are analyzed, and the impact of the local sea surface temperature (SST) anomaly over the western North Pacific (WNP) on the extreme EASM is investigated through sensitivity experiments of 28 years EASM simulations to the local SST over the WNP. The observation analysis reveals that the extreme EASM is influenced more by anomalous large-scale atmospheric features such as monsoon circulations and the western North Pacific subtropical high than the local SST anomaly over the WNP. However, the results of the sensitivity experiments show that the local SST anomaly has an implicit impact on the extreme EASM. The patterns of differences in precipitation between the experiment forced by observed SST in each year and the experiment forced by climatological SST over the WNP are opposite to anomaly patterns of observed precipitation in the extreme EASM years. This is because the SST anomaly over the WNP plays a role in reducing precipitation anomaly by changing surface latent heat flux and monsoon circulations. In particular, the local SST anomaly over the WNP decreases anomalies of large-scale circulations, i.e., the local Hadley and the Walker circulations. Thus, the local SST anomaly over the WNP plays a role in decreasing the interannual variability of the EASM.

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Acknowledgments

This work was funded by the Korea Meteorological Administration Research and Development Program under Grant RACS_2010-2016. This study was also partially supported by the BK21 program of the Korean Government Ministry of Education.

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  1. Atmospheric Sciences Program, School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-747, Korea

    Dong-Hyun Cha, Chun-Sil Jin & Dong-Kyou Lee

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  1. Dong-Hyun Cha
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  2. Chun-Sil Jin
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Correspondence to Dong-Kyou Lee.

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Cha, DH., Jin, CS. & Lee, DK. Impact of local sea surface temperature anomaly over the western North Pacific on extreme East Asian summer monsoon. Clim Dyn 37, 1691–1705 (2011). https://doi.org/10.1007/s00382-010-0983-z

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  • DOI: https://doi.org/10.1007/s00382-010-0983-z

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