BBC纪录片地平线《地球劫难日》第29期:碳-12激增的原因
日期:2019-09-23 11:26

(单词翻译:单击)

听力文本

To explain the amount of carbon 12 that we see in the geologic record
对于地质记录中发现大量碳-12的解释是,
we need to warm up the bottom water by somewhere in the order of about 5℃
海底某处的水温可能升高了大约5℃。
He published his results in 1999. He couldn't have anticipated their effect.
他于1999年发表了这一研究结果,其反响出乎他的意料。
5,000 miles away in England, however, Paul Wignall read Dickens's findings with growing interest.
在5000英里之外的英国,Paul Wignall以极大的兴趣拜读了Dickens的发现。
Suddenly realized that in fact a lot of his ideas as to how to explain carbon 12 increases
我突然意识到他的很多观点正好能解释碳-12激增的原因,
may actually apply to the story we're getting from Greenland.
补全了我们从格陵兰带回来的那个故事。
It's a kind of a missing link in the story for the Permian extinction.
它正是二叠纪生物大灭绝故事中漏掉的一环。

BBC纪录片地平线《地球劫难日》

Wignall now began to speculate.
此时Wignall开始思考。
What would be the effect on the world's climate of so much methane?
这么多甲烷会对全球气候造成何种影响呢?
It's one of the most potent greenhouse gases known to man.
它是人类已知最强的温室气体。
Wignall constructed a rough climate model, using the carbon 12 as a guide to the quantities of methane.
Wignall建了一个简单的气候模型,用碳-12作为甲烷数量的标记。
It's not that straightforward to work out just how significant the impact of this methane release would be,
它并不能直接研究出这些甲烷释放后的影响有多大,
but it's possible to work out the volumes emitted using the evidence from the carbon 12 increase,
但是能通过碳-12的增量计算出甲烷释放的热量,
and these certainly suggest that there may have been sufficient methane going into the atmosphere to perhaps increase global temperatures by 4/5℃.
结果表明只要有足够的甲烷进入大气就能使全球气温上升4-5℃。

视频及简介

如今,我们的世界生机盎然,随处可见活着的生灵。那么请想象一下所有这些生命有95%在一瞬间遭到了毁灭。这不是虚构的故事,它确实发生过。就在3亿年前的二迭纪,地球上还是一片丰饶繁荣的景象,然而2亿5千万年前的一场神秘事件导致了95%的物种灭绝,称为二迭纪生物大灭绝。这个凶残的杀手究竟是谁?是剧烈的地质运动、气候灾变,还是来自外太空的天体碰撞?为此,科学家们展开了一系列调查,试图解开“地球劫难日”惨剧背后的真相。


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