A Theory of Rain Band in Typhoon

[摘要] Elastoid-gravoid wave in a circular vortex can assume a radially banded feature under some conditions. Combining the factor exp (ikr) expressing pproximately such feature with the factor exp (ilθ) inherent for elastoid-gravoid wave, spiral regions of upward motion can exist, where γ and θ are radius and azimuthal angle, respectively. The wave of small l assumes a radially banded feature only near the center, and the wave of large l does not there.Discussions are given about generation of these waves, noticing the concentrated strong upward motion and abrupt change of wind velocity near the center.

[学科分类] 大气科学