神奇天象 实拍香港西贡令人惊叹的乳状云(组图)

riuRainbow Mandarin 彩虹汉语

riuRainbow Mandarin 彩虹汉语

riuRainbow Mandarin 彩虹汉语

riuRainbow Mandarin 彩虹汉语

 riuRainbow Mandarin 彩虹汉语

连续几天，香港新界连续出现极端天气，多地出现神奇的乳房状云（Mammatus cloud）。riuRainbow Mandarin 彩虹汉语

物理学家曾这样解释乳房状云：“它们是一些外观奇异的云彩。”有些科学家对乳房云的形成也有不同的见解。美国国家大气研究中心物理学家丹尼尔·布里德表示，空气的浮力和对流是形成乳房云的关键。riuRainbow Mandarin 彩虹汉语
riuRainbow Mandarin 彩虹汉语
这好像是上下颠倒的对流。” 对流就好比有浮力的气泡。以乳房云为例，在云中的空气冷却过程中，蒸发作用会引起大量负浮力，这使得缕缕云彩向下而不是像积云一样向上移动，最终，它们看上去就像上下颠倒的气泡一样。乳房云移动平缓的原因在于它们下面的温度结构。若没有这些外部条件，形成的云外观更加普通，不是高低不平，就是缕缕轻烟。只要有暴风雨的地方，肯定会看到乳房云。若是没有暴风雨，你要想看到乳房云，则一定要有令云浮起所需的大气条件。”riuRainbow Mandarin 彩虹汉语

不过普遍的说法是，乳房状云的出现是暴风云的前兆。riuRainbow Mandarin 彩虹汉语

 riuRainbow Mandarin 彩虹汉语

Several days in a row, New Territories, Hong Kong consecutive extreme weather much magic breast-shaped cloud Mammatus cloud.riuRainbow Mandarin 彩虹汉语
riuRainbow Mandarin 彩虹汉语
Physicist Patrick Chong had to explain breast like saying: "They are some of the strange appearance of the clouds." Some scientists also have different perceptions about breast cloud formation. The U.S. National Center for Atmospheric Research physicist Daniel Bridger, buoyancy and convection of the air is the key to the formation of breast cloud.riuRainbow Mandarin 彩虹汉语
riuRainbow Mandarin 彩虹汉语
This seems to be upside down convection. "Like buoyant bubbles. Breast cloud convection in the cloud in the air cooling process, evaporation will cause a lot of negative buoyancy, which makes the plume of clouds down instead of moving up like cumulus clouds, and ultimately, they looks like the upside of the bubble. breast clouds move gently because of the temperature structure below them. Without these external conditions, the formation of cloud look more ordinary, not rugged, and is the plume of smoke. Bridger said: "As long as the storm will certainly see the breast cloud. If there is no storm, you want to see the breast cloud, you must have to make Yunfu from the atmospheric conditions. "riuRainbow Mandarin 彩虹汉语
riuRainbow Mandarin 彩虹汉语
However, the common argument that the emergence of breast-shaped cloud is the precursor of the storm clouds.riuRainbow Mandarin 彩虹汉语

 riuRainbow Mandarin 彩虹汉语