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Drastic change in dynamics as Typhoon Lekima experiences an eyewall replacement cycle

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Abstract

Why does the 1909 typhoon, Lekima, become so destructive after making landfall in China? Using a newly developed mathematical apparatus, the multiscale window transform (MWT), and the MWT-based localized mutliscale energetics analysis and theory of canonical transfer, this study is intended to give a partial answer from a dynamical point of view. The ECMWF reanalysis fields are first reconstructed onto the background window, the TC-scale window, and the convection-scale window. A localized energetics analysis is then performed, which reveals to us distinctly different scenarios before and after August 8–9, 2019, when an eyewall replacement cycle takes place. Before that, the energy supply in the upper layer is mainly via a strong upper layer-limited baroclinic instability; the available potential energy thus-gained is then converted into the TC-scale kinetic energy, with a portion to fuel Lekima’s upper part, another portion carried downward via pressure work flux to maintain the cyclone’s lower part. After the eyewall replacement cycle, a drastic change in dynamics occurs. First, the pressure work is greatly increased in magnitude. A positive baroclinic transfer almost spreads throughout the troposphere, and so does barotropic transfer; in other words, the whole air column is now both barotropically and baroclinically unstable. These newly occurred instabilities help compensate the increasing consumption of the TC-scale kinetic energy, and hence help counteract the dissipation of Lekima after making landfalls.

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Acknowledgements

Thanks are due to ECMWF for making the data available. We appreciate the suggestions from three anonymous reviewers, which helped improve significantly the presentation of the material. This study is partially supported by the National Natural Science Foundation of China (Grant No. 41975064) and the 2015 Jiangsu Program for Innovation Research and Entrepreneurship Groups.

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Authors and Affiliations

  1. School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Fen Xu & X. San Liang

  2. School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    X. San Liang

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  1. Fen Xu
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  2. X. San Liang
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Correspondence to X. San Liang.

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Xu, F., Liang, X.S. Drastic change in dynamics as Typhoon Lekima experiences an eyewall replacement cycle. Front. Earth Sci. 16, 121–131 (2022). https://doi.org/10.1007/s11707-020-0865-6

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  • DOI: https://doi.org/10.1007/s11707-020-0865-6

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