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为什么西风带冬季最强

更新时间: 2020-09-19 00:00:00     

冬季温差大,气压差异大,水平气压梯度力大,风力也大。西风带又称盛行西风带,它位于南北半球的中纬度地区,常年吹偏西风,风速大。由于地球由西向东自转产生的地转偏向力,使北半球的南风转变成西南风,南半球的北风改变成西北风。而偏向力是随纬度增加而增大的,在中纬度这个力的作用是不容忽视的,这是西风带盛行西风最直接的因素。

关键词: 为什么 西风带 冬季

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