Abstract
The effects of the Beta term on the typhoon structure are examined within the linear framework in terms of an analytical method of 2—D Fourier representation and numerical experiments by a Beta—plane quasi-geostrophic barotropic model. Results show that the joint effects of the difference of Rossby phase velocities and the dispersion of typhoon energy keep the maximum wind velocity reasonably evolving rather than irrestrictively increasing. On the one hand, the nonlinear advection accelerates typhoon vortex damping, and on the other, the high pressure system formed downstream due to energy dispersion makes it easy to maintain.
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