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A simple diagnostic for eyewall replacement based on Pressure-Wind relationship
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  • Ping Lu,
  • Long Yang,
  • Jishi Zhang,
  • Danyang Wang,
  • Dingchi Zhao,
  • Xing Huang,
  • Xiaomeng Huang,
  • Yanluan Lin
Ping Lu
Tsinghua University

Corresponding Author:luping53@gmail.com

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Long Yang
Nanjing University
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Jishi Zhang
Tsinghua University
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Danyang Wang
Tsinghua University
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Dingchi Zhao
Tsinghua University
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Xing Huang
Tsinghua University, China
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Xiaomeng Huang
Ministry of Education Key Laboratory for Earth System Modeling, and Department for Earth System Science, Tsinghua University, Beijing 100084, China
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Yanluan Lin
Tsinghua University
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Abstract

Eyewall replacements occur in 70% of major tropical cyclones (TCs), and are associated with rapid changes in storm intensity and rapid broadening of strong winds. In this study, we present to use the radial gradient of absolute angular momentum with Holland’s wind profile as a simple diagnostic for eyewall replacement as internal variability of the storm. The diagnostic is solely dependent on the maximum wind speed, the radius of maximum wind, and the latitude and found to coincident with 70% of satellite observed concentric eyewalls for 1991-2020. The diagnostic can be expressed as a latitude-irrelevant Rossby Number of primary eyewall, varying with the peakedness of wind. It highlights the importance of pressure-wind relationship in eyewall replacement and provides a valuable tool to improve the understanding, modeling and risk assessment of storms with eyewall replacements.