涡度平流

500hPa层持续的高空正涡度平流以及700hPa低层暖平流非常有利于低涡的维持；

The maintain positive vorticity advection in the middle troposphere and the warm advection in the lower troposphere take advantage of the vortex development and maintain ;

Tim位于高空槽后，获得负涡度平流，在东部弱冷空气作用下，引起台风弱变性，并没有形成气旋，在东北地区被西风槽合并后消失，辽东半岛只出现10mm以下的降水。

Tim located in the rear of a high-level trough and obtained negative vorticity advection , with the effect of the feeble cold air from the east , only formed weak cold front in North China , and precipitation on Liaodong Peninsula was less than 10 mm .

结果表明，高原低涡东移到100°E附近时，其低涡东部的正涡度平流与负值非平衡强迫与850hPa四川盆地浅薄低涡发生垂直叠加时，两者之间发生耦合作用。

The results show that , when the Plateau vortex moving eastward near 100 ° E , the positive vorticity advection and the negative unbalanced force in the east part of the Plateau vortex on 500 hPa imposed on 850 hPa southwest vortex occurred the vertical superposition .

绝热冷却、负涡度平流和冷平流对气旋的发展起阻碍作用。

Adiabatic cooling , negative vorticity advection and cold advection prevented cyclone development .

而相对涡度平流项，在该次过程中作用不大。

But the effect of relative vorticity advection is much less during the torrential rain .

这些强迫函数是：1、实测风的微分涡度平流；

Forced Labor They are : 1 、 Differential Vorticity advection by the real wind ;

黑潮向南海的涡度平流输送。

Vorticity advection from the Kuroshio .

结果表明：涡度平流和β效应同样重要，它们对热带气旋的结构和移动均具有明显影响。

Results show that the vorticity advection term and beta term are two basic factors impacting on the structure and motion of typhoons .

气旋减弱阶段大气加热率所起的作用占主导地位，涡度平流和温度平流作用较小；

The effect of atmospheric heating rate accounted for dominant status while the cyclone was weakening , but the effect of vorticity advection and thermal advection was secondary ;

高空涡度平流、中低空温度平流、南北两支气流相遇促使地面低压强烈发展生成新的锋面气旋是大风形成的中尺度系统；

The gale was caused by the mesoscale system that the vorticity advection in upper , temperature advection in middle and lower layer , the explosively developing front cyclones .

中高纬冷空气的加入、对流层上层较强的辐散及正的涡度平流对气旋的再次发展起了关键作用。

The cold air from mid-high latitudes , the stronger pergence in the upper troposphere and the positive vorticity advection played a significant role in the re-development of the cyclone .

结果表明，温度平流和涡度平流、沿岸锋生以及高空急流的动力作用对气旋暴发性发展有重要贡献。

The results show that the dynamic functions of thermal advection , vorticity advection , coastal frontogenesis and air jet stream made great contribution to the explosive development of the cyclone .

通过对两个理想涡旋间非线性涡度平流过程的分析，揭示了双涡气旋性互旋及其中心间距变化的涡度平流机制。

Through analyzing the nonlinear vorticity advection between two idealized cyclonic vortices , the dynamical mechanism of both the mutual cyclonic rotation and the change of separation distance between two vortices have been revealed .

而对流层高层短波扰动的正涡度平流通过非地转平衡过程，引发中高层产生的上升运动，触发了潜在不稳定的释放。

Moreover , the positive vorticity advection of short wave disturbance in the upper troposphere initiated the ascending motion at the upper level and the releasing of the latent instability by ageostrophic balance processes .

试验结果表明：（1）只考虑相对涡度平流的情况下双涡以互旋为主，而且随着初始间距的缩小，互旋越来越明显。

Results indicate that ( 1 ) the twin-vortex mainly show rotation towards each other if only consider relative vorticity advection . This kind of rotation becomes more evident with the decreasing of the initial distance .

结果表明：蒙古气旋前部的暖平流、大范围正涡度区和正涡度平流导致了我国沈阳地区不稳定层结的建立和加强；

The results showed that the development and strengthen of instability stratification in Shenyang area resulted from warm advection of Mongolia cyclone foreside , large positive vorticity region and positive vorticity advection .

在组成总涡源各项中水平绝对涡度平流项和扭转项是负贡献，垂直涡度平流项和散度项为正贡献；

In the components of the total vorticity , the vection of the absolute vorticity and the distortion term were the negative contribution , and the others were opposed .

同时也发现总涡度倾向主要来自于涡度水平平流和散度场的贡献。

The results also show that the motion is directly related to total vorticity tendency , and this relationship is stable .

涡度方程分析还表明，对于涡度倾向变化的贡献中，水平涡度平流的贡献最大、β效应的贡献最小；

In the vorticity equation , the contribution to the vorticity trend from the horizontal advection term was the maximum , and the one from the Beta effect the minimum .