Copyright:
原文:
Why is this cloud so bubbly? Normally, cloud bottoms are flat. The flatness is caused by moist warm air that rises and cools and so condenses into water droplets at a specific temperature, which usually corresponds to a very specific height. As water droplets grow, an opaque cloud forms. Under some conditions, however, cloud pockets can develop that contain large droplets of water or ice that fall into clear air as they evaporate. Such pockets may occur in turbulent air near a thunderstorm. Resulting mammatus clouds can appear especially dramatic if sunlit from the side. These mammatus clouds were photographed over Regina, Saskatchewan, Canada during the summer of 2012.
中文翻譯:
這朵雲為何如此圓潤？通常，雲底部是平坦的。平坦的雲底是因為潮濕的暖空氣升起並冷卻，進而在特定溫度下凝結成水滴，這通常對應於一個非常具體的高度。隨著水滴的增長，形成了不透明的雲。然而，在某些情況下，雲層內部可能會出現包含大量水滴或冰的雲袋，這些水滴或冰在清晰空氣中下落並蒸發。這樣的雲袋可能在雷暴附近的湍流空氣中發生。最終形成的乳狀雲（mammatus clouds）在側光照射下尤為戲劇化。這些乳狀雲是在2012年夏天在加拿大薩斯喀徹溫省的瑞吉納（Regina）拍攝的。
#雲彩 #乳狀雲 #大自然的奇觀 #薩斯喀徹溫 #瑞吉納 #雲朵之美 #天氣現象
來源:NASA每日圖片
