由于地面冷热不均而形成的空气环流，称为热力环流。它是大气运动的一种简单的形式。
秋冬型更多受强天气系统的影响，春夏型则更多表现出局地中尺度热力环流特征。
The former is under effect of more strong synoptic systems, while the latter shows more characteristics of mesoscale thermal circulation induced by topography.
研究结果还表明：海风和陆风垂直方向呈非对称分布及热力环流具有明显的周期性变化。
Studies suggest that the vertical distribution of the breezes is asymmetric and the thermal circulation exhibits marked periodic variations.
分析了暴雨天气环流特征和动力热力条件。
Analyzed synoptic circulation character, dynamic and thermal terms of rainstorm.
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