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首页> 外文期刊>Acta Meteorologica Sinica >EFFECTS OF THREE KINDS OF PHYSICAL PROCESSES ON TYPHOON INTENSITY
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EFFECTS OF THREE KINDS OF PHYSICAL PROCESSES ON TYPHOON INTENSITY

机译：三种物理过程对台风强度的影响

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摘要

This paper designs three quasi-geostrophic barotropic models with a radial/horizontal grid length being 2 km, one in the polar coordinates, one on a stationary typhoon circulation condition and another on a non-stationary typhoon circulation condition in the Cartesian coordinates, to investigate the effects of azimuthal and radial linear advections, and nonlinear advection on the inward propagation of mesoscale vorticity and the changes of typhoon intensity. Results show that the azimuthal linear advection may result in the formation of spiral vorticity bands; the radial linear advection in a certain parameter set is able to transfer vorticity inwards, leading to a slight enhancement of typhoon; the nonlinear advection of perturbation vorticity on a stationary typhoon circulation condition may transfer more vorticities inwards, thus resulting in a distinct enhancement of typhoon; and the nonlinear advection on a non-stationary typhoon circulation condition possesses duality, i. e. on the one hand, the advection increases the vorticity of inward propagation, thus favorable to the intensification of typhoon, and on the other hand, in the inward propagation process of vorticity the originally concentric and axisymmetric structure of typhoon basic flow is damaged, and a complex flow pattern forms, which in turn tends to weaken the circulation of typhoon. At last the paper discusses the possible applications of those results in typhoon intensity prediction.
机译：本文设计了三种准地转正压模型，其径向/水平网格长度为2 km，一个在极坐标系下，一个在固定台风环流条件下，另一个在笛卡尔坐标系下在非平稳台风环流条件下进行研究。方位和径向线性对流以及非线性对流对中尺度涡旋向内传播和台风强度变化的影响。结果表明，方位线线性对流可能导致螺旋涡带的形成。一定参数集中的径向线性对流能够向内传递涡度，导致台风略有增强。在平稳的台风循环条件下，涡旋涡的非线性平流可能将更多的涡旋向内转移，从而导致台风明显增强。非平稳台风环流条件下的非线性对流具有对偶性。 e。一方面，对流增加了向内传播的涡度，从而有利于台风的激增；另一方面，在涡旋的向内传播过程中，台风基本流的原本同心且轴对称的结构受到了破坏，复杂的流型形式，反过来往往会削弱台风的流通。最后，本文讨论了这些结果在台风强度预测中的可能应用。

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