在抖音(TikTok)平台上,近日出现一段“七彩祥云”视频,只见云层中间出现彩虹,唯美之际又充满仙气,在网路上引起热论,有网民形容这是“吉兆”。
不过,翻查过去出现过类似景象的资料显示,美国国家航空暨太空总署(NASA)曾解释,虽然七彩云看起来很美,但却是暴雨来临前的警告。
根据网友在抖音分享的“七彩祥云”视频,只见两个螺旋状的云朵交叠,中间出现一道彩虹,看起来宛如仙境,视频获得数千万人按赞。有网友表示,“感觉有神仙住在里面”;“像是时空裂缝”;“或许能连接到另外一个时空”。
其实,这种云叫做“幞状彩云”(pileus iridescent cloud),属于大气现象。这是由于云内有强烈上升气流,当云顶有稳定且潮湿的水平气流通过,气流就被往上推,继而导致水气凝结成依附于云顶的幞状云。云朵内的小水滴很靠近而聚集下,光线经过晶体折射就呈现各种颜色。
去年9月初,大陆云南普洱市也曾出现带有彩虹的乌云,美国国家航空暨太空总署(NASA)当时解释,幞状彩云间藏有不少乌云,出现于普通积云上方时,代表较低的云正在向上发展,未来可能会形成风暴,这不仅是美丽的自然画面,也是恶劣天气来临的警告。
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