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A physical model of tropical cyclone central pressure filling at landfall

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Title: A physical model of tropical cyclone central pressure filling at landfall
Authors: Sparks, N
Toumi, R
Item Type: Journal Article
Abstract: We derive a simple physically based analytic model which describes the pressure filling of a tropical cyclone (TC) over land. Starting from the axisymmetric mass continuity equation in cylindrical coordinates we derive that the half-life decay of the pressure deficit between the environment and TC centre is proportional to the initial radius of maximum surface wind speed. The initial pressure deficit and column-mean radial inflow speed into the core are the other key variables. The assumptions made in deriving the model are validated against idealised numerical simulations of TC decay over land. Decay half-lives predicted from a range of initial TC states are tested against the idealized simulations and are in good agreement. Dry idealised TC decay simulations show that without latent convective heating, the boundary layer decouples from the vortex above leading to a fast decay of surface winds while a mid-level vortex persists.
Issue Date: 1-Oct-2022
Date of Acceptance: 23-Jun-2022
URI: http://hdl.handle.net/10044/1/98198
DOI: 10.1175/JAS-D-21-0196.1
ISSN: 0022-4928
Publisher: American Meteorological Society
Start Page: 2585
End Page: 2599
Journal / Book Title: Journal of the Atmospheric Sciences
Volume: 79
Issue: 10
Copyright Statement: © 2022 American Meteorological Society.
Sponsor/Funder: Natural Environment Research Council (NERC)
Funder's Grant Number: NE/V017756/1 & LDR01000
Keywords: Meteorology & Atmospheric Sciences
0401 Atmospheric Sciences
Publication Status: Published
Online Publication Date: 2022-07-14
Appears in Collections:Space and Atmospheric Physics
Physics
Grantham Institute for Climate Change
Faculty of Natural Sciences



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