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meteorobs 发表于 2004-1-22 01:34 | 显示全部楼层 |阅读模式 来自: 中国–天津–天津 联通

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Astronomy Picture of the Day

2004 January 12

Explanation: What could create a huge hole in the clouds? Such a hole, likely hundreds of meters across, was photographed last month from a driveway near Mobile, Alabama, USA. Very unusual to see, hole-punch clouds like this are still the topic of meteorological speculation. A leading hypothesis holds that the hole-punch cloud is caused by falling ice-crystals. The ice-crystals could originate in a higher cloud or be facilitated by a passing airplane exhaust. If the air has just the right temperature and moisture content, the falling crystals will absorb water from the air and grow. For this to happen, the water must be so cold that all it needs is a surface to freeze on. The moisture lost from the air increases the evaporation rate from the cloud water droplets so they dissipate to form the hole. The now heavier ice crystals continue to fall and form the more tenuous wispy cloud-like virga seen inside and just below the hole. Water and ice from the virga evaporates before they reach the ground.

A Hole Punch Cloud Over Alabama
Credit & Copyright: Joel Knain

holecloud_knain.jpg

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玄天凌龙 发表于 2004-1-22 03:46 | 显示全部楼层 来自: 中国–黑龙江–佳木斯 联通/冲浪网吧
大哥!弄这么吓人的东西干什么呀!!
还有,可以将正文翻译一下么?
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禁止心跳 发表于 2004-1-25 16:25 | 显示全部楼层 来自: 中国–辽宁–辽阳 联通
是真地还是电脑做地?
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shistone 发表于 2004-1-26 00:59 | 显示全部楼层 来自: 中国–上海–上海 鹏博士宽带
好像是一种大气现象哦,但是具体的看不大明白……
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