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Upscale feedback of high-frequency winds on seasonal SST change over the tropical western North Pacific during boreal summer

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Abstract

Present study compares the contribution of low-frequency (> 90-day) and high-frequency (< 90-day) variation-related latent heat flux (LHF) to seasonal sea surface temperature (SST) change during boreal summer. It is revealed that both low- and high-frequency LHFs have prominent but opposite contributions to seasonal SST change in the tropical western North Pacific (WNP) during boreal summer. The feedback of high-frequency LHF on the seasonal SST change in the WNP is strong during El Niño events but weak during La Niña events. The difference in the feedback of high-frequency LHF is due to two factors. One is the background surface wind and the other is the intensity of high-frequency wind fluctuations. The high-frequency LHF displays a large non-linear dependence on surface wind under the weak background surface wind during El Niño developing summers, which leads to an accumulation of high-frequency daily LHF in summer mean. The high-frequency wind variability is large over the WNP during El Niño developing summers, which further enhances the accumulation of high-frequency daily LHF. The strong background surface wind and relatively weak high-frequency wind variability during La Niña developing summers are unfavorable for the accumulation of high-frequency daily LHF. This leads to a small summer mean of high-frequency LHF so that the upscale feedback of high-frequency wind variations on seasonal SST change is weak in the WNP during La Niña developing summers.

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Acknowledgements

The comments of two anonymous reviewers have helped the improvement of the paper. This study is supported by the National Natural Science Foundation of China Grants (41721004, 41530425 and 41775080). The TropFlux data were extracted from https://incois.gov.in/tropflux/.

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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

  5. Guangzhou Meteorological Observatory, Guangzhou, China

    Yang Jiao

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  1. Yuqi Wang
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  2. Renguang Wu
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  3. Yang Jiao
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Correspondence to Renguang Wu.

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Wang, Y., Wu, R. & Jiao, Y. Upscale feedback of high-frequency winds on seasonal SST change over the tropical western North Pacific during boreal summer. Clim Dyn 55, 2439–2451 (2020). https://doi.org/10.1007/s00382-020-05391-3

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  • DOI: https://doi.org/10.1007/s00382-020-05391-3

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