未登录,请登录后再发表信息
最新评论 (0)
播放视频

冻土下的隐患

The Hidden Perils of Permafrost | Deep Look

看起来不太可能 但是在这些北极冰雪下存在一个潜在的
It may not look like it, but underneath all this Arctic snow is a potential climate change
气候变化灾难
catastrophe.
这是永久冻结带 即全年都是冰冻状态的土壤
This is permafrost… soil that stays frozen all year round.
你能看到里面的东西 满满的矿物质腐蚀着植物和冰
And you can see, inside, how it’s packed with minerals, decaying plants and ice.
劳伦斯伯克利国家实验室以及其他机构的研究者正在将
Researchers from Lawrence Berkeley National Lab and other institutions are pulling permafrost
这样的冻土核心从阿拉斯加的巴罗地下取出来
cores like this one out of the ground in Barrow, Alaska.
永久冻土几乎覆盖了北半球土地面积的三分之一
Permafrost covers nearly a quarter of the land mass in the Northern Hemisphere and all
这些死亡的植物相当于很大一部分存在于土壤中的二氧化碳
those dead plants amount to a huge amount of carbon trapped in the soil.
几乎是我们人类每年排放到大气层的200倍
It’s almost 200 times what we humans pump into the atmosphere each year.
所以 如果气候变化导致冻土解冻 那些碳会怎么样?
So what happens to all that carbon if a warming climate causes the permafrost to thaw?
科学家们正在用所有其可想到的科研工具
Scientists are throwing every conceivable piece of scientific hardware at one small
研究一小块冻土的每个惊人细节
patch of permafrost, to study it in incredible detail.
他们希望了解冻土的详细构成 有多少冰 有哪些物质
They want to know exactly what’s buried inside. How much ice? What kinds of materials
有哪几种细菌
and bacteria?
以及随着全球气温的持续上升 它会有什么反应
And how will it all react as global temperatures continue to rise?
科学家改用了CT扫描机 其常用与诊断人类疾病
They’re repurposing a CT scanner, an instrument normally used to diagnose disease in people.
我们正从临近表层的部分开始 深入核心
We’re traveling down the length of the core — starting with the part closest to the surface.
这里是活跃层 每年春天它会解冻 到秋天的时候又
This is called the active layer. It thaws every spring and then freezes again in the
再次冻上
fall.
现在我们看到的是真正的冻土 或许土壤已经冻了几千年
Now we’re moving into the actual permafrost. This soil may have been frozen for ten thousand
或者更久
years or longer.
那么如果它发生变化呢?
So what if that starts to change?
冻土融化 其中的细菌开始活跃 以死掉的植物
When permafrost thaws the bacteria inside spring to life. They start eating the dead
为食
plants.
它们一边进食 一边释放出温室气体 比如二氧化碳和甲烷
And as they eat, they release greenhouse gases– like carbon dioxide and methane — that trap
从而将热量拦在大气层里
heat in the atmosphere.
科学家担心的是随着气候变暖 会有越来越多的冻土
And what worries scientists is that as the climate warms, more and more of the permafrost
解冻
will thaw.
几千年来存在于冻土中的碳将在非常短的时间内
Carbon that’s been locked in the soil for millennia may be released in a very short
释放出来 阻止热量散发到大气层外
amount of time trapping more heat in the atmosphere.
这可能变成一个灾难性的反馈回路
This could be a catastrophic feedback loop.
可能比那个更麻烦
But it could be more complicated than that…
那如果过多的二氧化碳利于地表植物的生长
What if the extra carbon dioxide makes more plants grow at the surface, and the extra
过量的植物又吸收掉一部分冻土中释放的碳呢?
plants actually absorb some of that carbon released when the permafrost thaws?
听起来有点细微差别 但其对我们这个星球的命运却
This sounds like a subtle distinction, but it could have a huge impact on the fate of
有着巨大影响
our planet.
这次研究的目的就是了解我们被迫面临的情况
The goal of this research is to know what we’re headed for.
部分答案就藏在冰冻着的厚厚的土壤下
Some of the answers may lie in this chunk of icy earth.

发表评论

译制信息
视频概述

随着全球气候变暖,冻土融化,其中的细菌将给我们的星球带来什么样的影响?

听录译者

收集自网络

翻译译者

小星星

审核员

译学馆审核员F

视频来源

https://www.youtube.com/watch?v=wxABO84gol8

相关推荐
笨蛇