2018_2019学年高中地理第二章地球上的大气2.2气压带和风带课件3新人教版必修1.ppt

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0,30N,60N,90N,30S,90S,60S,冬季,大陆会形成高压还是低压?阐述理由。,同一纬度上,大陆气温低,空气冷而重;,冬季,高压,高压,低压,0,30N,60N,90N,30S,90S,60S,夏季,大陆会形成高压还是低压?阐述理由。,同一纬度上,大陆气温高,空气暖而轻;,夏季,低压,低压,高压,一月,七月,副 极 地 低 气 压 带,副 热 带 高 气 压 带,在海洋和陆地之间不同季节形成不同的高、低气压中心,总结,为什么北半球气压带被切断,呈块状分布,而南半球气压带保留相对较为完整?,思考,海陆热力差异和海陆分布状况决定了大气环流的变化,导致气压带和风带的分布变得更加复杂化。由于这种影响使得海陆之间在不同季节出现了气压差异,从而导致海陆之间出现了随季节转变风向的风。,北半球陆地和海洋相间分布,且北半球陆地面积广大,而南半球则是以海洋为主。,季风,东亚季风,课堂小结,2、季风 环流,成因,海陆热力 性质差异,气压带风带的季节移动,分布及特点,1、北半球气压中心,形成原因:海陆热力性质的差异,

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