宇航员拍下罕见圆盘状巨型云团
本帖最后由 skyczheng 于 2009-8-4 21:01 编辑来源：中国新闻网
据英国媒体7月29日报道，近日，国际空间站的宇航员拍摄到了一个奇异的景观：一个圆盘状的巨型云团正翻腾着向地球大气层靠近，隐现于非洲西部上空。
可惜的是，生活在地球上的人们无法看到这一异象，即便是从距离地面75000英尺(约22.86公里)的飞机上也无法观察到这一壮观的景象。
然而，在数百英里的高空中，正随着国际空间站围绕地球轨道运行的宇航员们却捕捉到了这一惊人的景观。
通常情况下，这种圆盘状的云团是由冰构成的，一般而言形成于雷暴的顶部。由于雷暴中的热空气从底部的同温层向上升，同时不断扩散，最终形成这种圆盘状的云团。在云团周围常常有雪花
飘落。然而，当雪花落入雷暴上端相对干燥的空气中，就会迅速蒸发并消失。
找不到大图，谁有大图请帖上！ "翻腾着向地球大气层靠近"?
莫非是超级积雨云?能否给个原文?翻译语焉不详... 没有什么云会高到20km。飞机应该可以看到。 ::070821_19.jpg::好漂亮的东东啊 "翻腾着向地球大气层靠近"?
莫非是超级积雨云?能否给个原文?翻译语焉不详...
shiaki 发表于 2009-8-2 23:46 http://www.astronomy.com.cn/bbs/images/common/back.gif
我英文不太好。看看是这个吗？
ISS016-E-027426 (5 Feb. 2008) --- Cumulonimbus Cloud over Africa is featured in this image photographed by anedition 16 crewmember on the International Space Station. Deemed by many meteorologists as one of the most impressive of cloud formations, cumulonimbus (from the Latin for "puffy" and "dark") clouds form due to vigorous convection of warm and moist unstable air. Surface air warmed by the Sun-heated ground surface rises, and if sufficient atmospheric moisture is present, water droplets will condense as the air mass encounters cooler air at higher altitudes. The air mass itself also expands and cools as it rises due to decreasing atmospheric pressure, a process known as adiabatic cooling. This type of convection is common in tropical latitudes year-round and during the summer season at higher latitudes. As water in the rising air mass condenses and changes from a gaseous to a liquid state, it releases energy to its surroundings, further heating the surrounding air and leading to more convection and rising of the cloud mass to higher altitudes. This leads to the characteristic vertical "towers" associated with cumulonimbus clouds, an excellent example of which is visible in this image (right). If enough moisture is present to condense and continue heating the cloud mass through several convective cycles, a tower can rise to altitudes of approximately 10 kilometers at high latitudes to 20 kilometers in the tropics -- before encountering a region of the atmosphere known as the tropopause. The tropopause is characterized by a strong temperature inversion where the atmosphere is dryer and no longer cools with altitude. This halts further vertical motion of the cloud mass, and causes flattening and spreading of the cloud tops into an anvil-shaped cloud as illustrated by this oblique photograph. The view direction is at an angle from the vertical, rather than straight "down" towards the Earth's surface. The image, photographed while the International Space Station was passing over western Africa near the Senegal-Mali border, shows a fully-formed anvil cloud with numerous smaller cumulonimbus towers rising near it. The high energetics of these storm systems typically make them hazardous due to associated heavy precipitation, lightning, high wind speeds and possible 这云是如何形成的？ 立体型真是强到极点 那图的右侧感觉像是飓风的风眼。。。::070821_02.jpg:: 云彩上面的云彩！ 壮观，立体感好强::070821_09.jpg:: 不罕见吧,只是一个大的积雨云...原文这样说的
Cumulonimbus Cloud - 积雨云
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