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Patterns and factors of interannual variations of boreal summer intraseasonal oscillation intensity over tropical western North Pacific

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Abstract

Present study analyzes spatial patterns and factors of interannual variations of 10–20-day and 30–60-day intraseasonal oscillation (ISO) intensity during boreal summer over tropical western North Pacific (WNP). The three leading modes of 10–20-day ISO intensity variation feature a southeast–northwest distribution, a southeast–northwest contrasting pattern, and large loading over the subtropics, respectively. The two leading modes of 30–60-day ISO intensity variation show a west–east distribution and a west–east dipole pattern, respectively. Three types of sea surface temperature (SST) influences are identified on the ISO intensity variation. One is a direct influence of El Niño–Southern Oscillation (ENSO) on seasonal mean background over tropical WNP via a Rossby wave type response. This type of influence is prominent on the leading mode of 10–20-day ISO intensity and the eastern portion of the second mode of both 10–20-day and 30–60-day ISO intensity. Second is an indirect influence of ENSO on seasonal mean background over subtropical WNP and the Maritime Continent through anomalous Walker circulation. This type of influence includes the western portion of the second mode of both 10–20-day and 30–60-day ISO intensity. Third is an influence of regional SST anomalies. Opposite SST anomalies in the North Indian Ocean and tropical North Pacific work together to modulate seasonal mean background over tropical WNP. This type of influence is prominent on the leading mode of 30–60-day ISO intensity. In addition, internal atmospheric process may play a role in 10–20-day ISO intensity change over subtropical WNP.

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Acknowledgements

The comments of two anonymous reviewers have help the improvement of this paper. This study is supported by the National Natural Science Foundation of China Grants (41530425, 41775080 and 41721004). The NCEP-DOE reanalysis 2 data were obtained via ftp://ftp.cdc.noaa.gov and the NOAA OI2 SST data were obtained from http://www.esrl.noaa.gov/psd/.

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Authors and Affiliations

  1. Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

    Yuqi Wang & Renguang Wu

  2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China

    Yuqi Wang

  3. School of Earth Sciences, Zhejiang University, Hangzhou, China

    Renguang Wu

  4. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China

    Renguang Wu

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  1. Yuqi Wang
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  2. Renguang Wu
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Correspondence to Renguang Wu.

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Wang, Y., Wu, R. Patterns and factors of interannual variations of boreal summer intraseasonal oscillation intensity over tropical western North Pacific. Clim Dyn 54, 2085–2099 (2020). https://doi.org/10.1007/s00382-019-05100-9

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  • DOI: https://doi.org/10.1007/s00382-019-05100-9

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