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Impacts of early/late South China Sea summer monsoon withdrawal on tropical cyclone genesis over the western North Pacific

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Abstract

This study reveals a significant in-phase relationship between the South China Sea summer monsoon (SCSSM) withdrawal date and tropical cyclone (TC) genesis over the western North Pacific (WNP). The number of TCs generated over the WNP from mid-September to mid-October is positively correlated with the SCSSM withdrawal date during the period of 1979–2016. The decreased (increased) number of TCs generated during early (late) SCSSM withdrawal years is attributed to both internal atmospheric dynamics and external sea surface temperature (SST) forcing. Through dynamic (Rossby wave response) and thermodynamic (increased moisture) processes, the warm SST anomalies during late withdrawal years over the tropical WNP contribute to maintaining the monsoon trough (MT) in the boreal autumn and moisturizing the mid-level atmosphere, providing a favorable environment for TC genesis. The remaining MT can facilitate the conversion of mean kinetic energy into eddy kinetic energy (EKE) and enhance synoptic-scale waves. In addition, upper-level baroclinic energy conversion also contributes to EKE development. Both barotropic and baroclinic processes favor TC genesis over the WNP. In contrast, colder SSTs during early withdrawal years induce the early withdrawal of the MT, leading to depressed enhancement of the EKE and weakening the northwestward propagation of synoptic-scale waves. Hence, fewer (more) TCs tend to be generated during early (late) withdrawal years.

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Acknowledgements

This study was supported jointly by the National Key Research and Development Program of China (2016YFA0600603), the National Natural Science Foundation of China (Grant No. 41705071) and Key Program of the Chinese Academy of Sciences (Grant QYZDY-SSW-DQC024). The authors are grateful for the suggestions provided by the anonymous reviewers.

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Authors and Affiliations

  1. Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Peng Hu, Jingliang Huangfu, Wen Chen & Ronghui Huang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Peng Hu & Wen Chen

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  1. Peng Hu
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Correspondence to Jingliang Huangfu or Wen Chen.

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Hu, P., Huangfu, J., Chen, W. et al. Impacts of early/late South China Sea summer monsoon withdrawal on tropical cyclone genesis over the western North Pacific. Clim Dyn 55, 1507–1520 (2020). https://doi.org/10.1007/s00382-020-05339-7

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