回南天








回南天（簡稱回南）是中国南方一种特有现象，原因在中国南方经过了一个冬天，物体温度低，阳春三月气温升高，物体温度（特别是厚大物体）一时未能升高，这时低温的物体面与来自太平洋的南风（南风经过太平洋时吸收着大量的水蒸汽）的水蒸汽接触，水蒸汽遇冷结成水，这就是回南的原因。由于二、三月仍时有干燥北风进境，暂时逼退南方湿暖气流，凝结水蒸发没补充，北风停止后又恢复南风进境。所以会导致出现多次回南情况。


回南天的潮濕天氣，可使部份建築物的牆壁或地面滲水，衣服、皮革及木製品也較容易發霉。



參見


  • 香港氣候



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