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空气密度减小，气压降低

热 力环流的原理. 空气密度减小，气压降低. 高空. 1020hpa. 1060hpa. 1100hpa. 地面. B. A. C. 热 力环流的原理. 低. 低. 高. 空气密度逐渐减小 , 气压降低. 高空. 1020hpa. 1060hpa. 1100hpa. 低. 高. 高. 地面. 冷却. 受热. 冷却. B. A. C. （根本原因）. ( 直接原因）. 空气的垂直运动. 地区间冷热差异. 同一水平面的气压差异. 大气的水平运动. 热力环流.

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空气密度减小，气压降低

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  1. 热力环流的原理 空气密度减小，气压降低 高空 1020hpa 1060hpa 1100hpa 地面 B A C

  2. 热力环流的原理 低 低 高 空气密度逐渐减小,气压降低 高空 1020hpa 1060hpa 1100hpa 低 高 高 地面 冷却 受热 冷却 B A C

  3. （根本原因） (直接原因） 空气的垂直运动 地区间冷热差异 同一水平面的气压差异 大气的水平运动 热力环流

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