The turbulent diffusivity is unfavourable to ascending motion.

湍流扩散作用不利于上升运动形成。

The center of ascending motion swings around the equator with variation of seasons.

上升运动的中心随着季节的变化在赤道地区南北移动。

The simulated results show that there are two obvious water vapor channels during the freezing-rain process, and the ascending motion is significant.

结果表明， 这次冻雨过程期间有两条明显的水汽通道， 上升运动明显。