Effects of surface exchange coefficients for high wind speeds on intensity and structure of tropical cyclones

Numerical simulations for typhoon IOKE(2006)

Yoshiaki Miyamoto, Tetsuya Takemi

Research output: Contribution to journalArticle

Abstract

Numerical simulations for Typhoon Ioke (2006) are carried out by using the WRF model and that with the revised formulation of exchange coefficients for momentum (Cd) and enthalpy (Ck), in order to examine the influences of surface exchange coefficients in strong winds upon the structure and intensity of tropical cyclones. The simulated results show that the reduced exchange coefficients in strong winds do not significantly affect the minimum surface pressure of the tropical cyclone while the maximum wind speed at the surface increases significantly. Furthermore, it is found that the convective intensity is significantly decreased in the reduced-Cd case specifically in the eyewall region. It is also shown that in spite of the reduced drag coefficient at high wind speed, the surface convergence does not change.

Original languageEnglish
Pages (from-to)275-283
Number of pages9
JournalTheoretical and Applied Mechanics Japan
Volume59
Publication statusPublished - 2011 Oct 24
Externally publishedYes

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Tropical Cyclone
Typhoon
cyclones
Wind Speed
High Speed
Numerical Simulation
Computer simulation
Coefficient
coefficients
simulation
Drag Coefficient
drag coefficients
Drag coefficient
Enthalpy
Momentum
enthalpy
momentum
formulations
Formulation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mathematics(all)

Cite this

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abstract = "Numerical simulations for Typhoon Ioke (2006) are carried out by using the WRF model and that with the revised formulation of exchange coefficients for momentum (Cd) and enthalpy (Ck), in order to examine the influences of surface exchange coefficients in strong winds upon the structure and intensity of tropical cyclones. The simulated results show that the reduced exchange coefficients in strong winds do not significantly affect the minimum surface pressure of the tropical cyclone while the maximum wind speed at the surface increases significantly. Furthermore, it is found that the convective intensity is significantly decreased in the reduced-Cd case specifically in the eyewall region. It is also shown that in spite of the reduced drag coefficient at high wind speed, the surface convergence does not change.",
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PY - 2011/10/24

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AB - Numerical simulations for Typhoon Ioke (2006) are carried out by using the WRF model and that with the revised formulation of exchange coefficients for momentum (Cd) and enthalpy (Ck), in order to examine the influences of surface exchange coefficients in strong winds upon the structure and intensity of tropical cyclones. The simulated results show that the reduced exchange coefficients in strong winds do not significantly affect the minimum surface pressure of the tropical cyclone while the maximum wind speed at the surface increases significantly. Furthermore, it is found that the convective intensity is significantly decreased in the reduced-Cd case specifically in the eyewall region. It is also shown that in spite of the reduced drag coefficient at high wind speed, the surface convergence does not change.

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