[00:00:23]Andy Smith works for the British Antarctic Survey.

安迪·史密斯在英国南极调查局工作

[00:05:22]What we have here is one kilo of pentolite explosive.

这里有一公斤炸药

[00:09:06]We're going to use this to generate a shockwave

我们将用它释放出冲击波

[00:12:23]and record the echoes that come back from underneath the ice.

同时记录地下冰层的反馈数据

[00:17:58]Andy is particularly interested in mapping

安迪对描绘沿海

[00:22:49]the underside of the ice around the coast.

地下冰层的结果十分感兴趣

[00:26:59]Because here, it isn't resting on land.

因为在这里 冰块并非固定在陆地上

[00:30:30]It's floating on sea water,

而是漂浮在海面上

[00:32:42]so if sea temperatures rise just a little,

因此 如果海水温度稍有上升

[00:35:43]it can be melted from below.

它的下端就会融化

[00:37:36]Around the coast of Antarctica,

南极大陆海岸周围

[00:42:07]the glaciers have flowed out across the sea

冰川沿海面向外漂浮

[00:44:15]to form immense masses of floating fresh water ice,

形成了广袤无边的浮动淡水冰层

[00:47:49]called ice shelves.

被称为冰架

[00:49:51]These freeze to the land around them,

冰架在陆地四周凝结

[00:56:49]sticking fast and acting like bathplugs,

像浴缸塞一样紧紧卡住

[00:58:59]holding back the flow of the glaciers into the sea.

防止冰川流入海中

[01:05:46]On the Antarctic Peninsula, a one-degree sea temperature rise

过去三十年中 南极半岛上

[01:09:37]has helped to break apart

温度每升高一度

[01:10:57]seven major ice shelves in the last 30 years.

就会分裂掉七个主要的冰架

[01:16:07]This is the Larsen B ice shelf,

这是拉森B号冰架

[01:18:39]three times the size of Greater London, breaking apart in 2002.

有大伦敦区三倍大 于2002年分裂

[01:21:59]Afterwards, the glaciers it had been holding back

后来 之前被抑制的冰川

[01:28:05]started flowing up to six times faster.

开始以七倍的速度流走

[01:35:01]In 2008, a much larger ice shelf

2008年 在半岛南端

[01:37:35]at the southern end of the Peninsula started to break up.

一块更大的冰架开始破裂

[01:40:25]It's an enormous event that's never been filmed before.

人类从来没有记录过这么大的一次破裂