評論
打印
Andy Smith works for the British Antarctic Survey.
安迪·史密斯在英國南極調(diào)查局工作
What we have here is one kilo of pentolite explosive.
這里有一公斤炸藥
We're going to use this to generate a shockwave
我們將用它釋放出沖擊波
and record the echoes that come back from underneath the ice.
同時記錄地下冰層的反饋數(shù)據(jù)
Andy is particularly interested in mapping
安迪對描繪沿海
the underside of the ice around the coast.
地下冰層的結(jié)果十分感興趣
Because here, it isn't resting on land.
因為在這里 冰塊并非固定在陸地上
It's floating on sea water,
而是漂浮在海面上
so if sea temperatures rise just a little,
因此 如果海水溫度稍有上升
it can be melted from below.
它的下端就會融化
Around the coast of Antarctica,
南極大陸海岸周圍
the glaciers have flowed out across the sea
冰川沿海面向外漂浮
to form immense masses of floating fresh water ice,
形成了廣袤無邊的浮動淡水冰層
called ice shelves.
被稱為冰架
These freeze to the land around them,
冰架在陸地四周凝結(jié)
sticking fast and acting like bathplugs,
像浴缸塞一樣緊緊卡住
holding back the flow of the glaciers into the sea.
防止冰川流入海中
On the Antarctic Peninsula, a one-degree sea temperature rise
過去三十年中 南極半島上
has helped to break apart
溫度每升高一度
seven major ice shelves in the last 30 years.
就會分裂掉七個主要的冰架
This is the Larsen B ice shelf,
這是拉森B號冰架
three times the size of Greater London, breaking apart in 2002.
有大倫敦區(qū)三倍大 于2002年分裂
Afterwards, the glaciers it had been holding back
后來 之前被抑制的冰川
started flowing up to six times faster.
開始以七倍的速度流走
In 2008, a much larger ice shelf
2008年 在半島南端
at the southern end of the Peninsula started to break up.
一塊更大的冰架開始破裂
It's an enormous event that's never been filmed before.
人類從來沒有記錄過這么大的一次破裂
