Open AccessThe Role of Convective Heating in Tropical Cyclone Eyewall Ring Evolution
Author(s) -
Chia-Chien Wu,
Shun-Nan Wu,
HoHsiang Wei,
Sergio F. Abarca
Publication year - 2015
Publication title -
journal of the atmospheric sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.853
H-Index - 173
eISSN - 1520-0469
pISSN - 0022-4928
DOI - 10.1175/jas-d-15-0085.1
Subject(s) - diabatic , potential vorticity , vorticity , eye , tropical cyclone , positive vorticity advection , advection , convection , climatology , atmospheric sciences , instability , meteorology , mechanics , physics , environmental science , geology , vortex , adiabatic process , thermodynamics
The purpose of this study is to analyze the role of diabatic heating in tropical cyclone ring structure evolution. A full-physics three-dimensional modeling framework is used to compare the results with two-dimensional modeling approaches and to point to limitations of the barotropic instability theory in predicting the storm vorticity structure configuration. A potential vorticity budget analysis reveals that diabatic heating is a leading-order term and that it is largely offset by potential vorticity advection. Sawyer–Eliassen integrations are used to diagnose the secondary circulation (and corresponding vorticity tendency) forced by prescribed heating. These integrations suggest that diabatic heating forces a secondary circulation (and associated vorticity tendency) that helps maintain the original ring structure in a feedback process. Sensitivity experiments of the Sawyer–Eliassen model reveal that the magnitude of the vorticity tendency is proportional to that of the prescribed heating, indicating that diabatic heating plays a critical role in adjusting and maintaining the eyewall ring.