A physical model of tropical cyclone central pressure filling at landfall
File(s)
Accepted version
Author(s)
Sparks, Nathan
Toumi, Ralf
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.
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.
Date Issued
2022-10-01
Date Acceptance
2022-06-23
Citation
Journal of the Atmospheric Sciences, 2022, 79 (10), pp.2585-2599
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.
License URL
Sponsor
Natural Environment Research Council (NERC)
Grant Number
NE/V017756/1 & LDR01000
Subjects
Meteorology & Atmospheric Sciences
0401 Atmospheric Sciences
Publication Status
Published
Date Publish Online
2022-07-14