The western wind in low-level prevails in this region, and the vertical shear is weaken. The anomalous anti-cyclonic circulation are produced, hence the rainfall reduces over the region.
在中国南部地区高空为异常的偏西气流,意味着高空偏东风的减弱,而低层仍然为异常偏西风,该地区上空的垂直切变减弱,有利于反气旋环流的产生,因此导致东南沿海地区降水减少。
参考来源 - 青藏高原气候环境对冰川发育影响的数值模拟研究·2,447,543篇论文数据，部分数据来源于NoteExpress
With TC strengthening the vertical shear becomes weaker.
风速垂直切变随tc加强而减弱。
Weak vertical shear and warm sea surface are other reasons to remain the intensity of typhoon.
弱的垂直切变和暖洋面的存在也是台风强度维持的原因之一。
Vertical shear injuries are vertically and rotationally unstable owing to disruption of the posterior ligaments.
垂直剪切型损伤由于后方韧带断裂而致垂直和旋转不稳。
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