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转载】 海冰对生物破坏性影响的一个例子 (an amazing video)

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RuChen 发表于 2011-12-2 15:39:44 | 显示全部楼层 |阅读模式
本帖最后由 RuChen 于 2011-12-2 15:55 编辑

英国广播公司(BBC)摄制组人员首次在南极水下拍摄到这种“死亡冰柱”。冰山下的寒冷海流让这种“冰柱”在下沉过程中迅速扩张,与其接触而冰冻的海水看上去更像海绵而非普通海冰。由于“冰柱”温度很低,在其经过的海床上,海星等生物都被冻死 (http://video.sina.com.cn/p/tech/d/v/2011-11-25/084561570429.html)。
Once can watch the amazing video from the following website:
http://www.bbc.co.uk/nature/15835017



Pictures from the BBC websites

冰柱旁不幸的生物


从海面到海底的‘死亡冰柱’

相信海洋中还有好多人类还没有观测到的惊人现象。

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 楼主| RuChen 发表于 2011-12-2 15:42:28 | 显示全部楼层
本帖最后由 RuChen 于 2011-12-2 15:43 编辑

The BBC news (http://www.bbc.co.uk/nature/15835017)
A bizarre underwater "icicle of death" has been filmed by a BBC crew.
With timelapse cameras, specialists recorded salt water being excluded from the sea ice and sinking.

The temperature of this sinking brine, which was well below 0C, caused the water to freeze in an icy sheath around it.

Where the so-called "brinicle" met the sea bed, a web of ice formed that froze everything it touched, including sea urchins and starfish.

The unusual phenomenon was filmed for the first time by cameramen Hugh Miller and Doug Anderson for the BBC One series Frozen Planet.
Creeping ice
The icy phenomenon is caused by cold, sinking brine, which is more dense than the rest of the sea water. It forms a brinicle as it contacts warmer water below the surface.

Mr Miller set up the rig of timelapse equipment to capture the growing brinicle under the ice at Little Razorback Island, near Antarctica's Ross Archipelago.

"When we were exploring around that island we came across an area where there had been three or four [brinicles] previously and there was one actually happening," Mr Miller told BBC Nature.

The diving specialists noted the temperature and returned to the area as soon as the same conditions were repeated.

"It was a bit of a race against time because no-one really knew how fast they formed," said Mr Miller.

"The one we'd seen a week before was getting longer in front of our eyes... the whole thing only took five, six hours."
Against the odds
The location - beneath the ice off the foothills of the volcano Mount Erebus, in water as cold as -2C - was not easy to access.

"That particular patch was difficult to get to. It was a long way from the hole and it was quite narrow at times between the sea bed and the ice," explained Mr Miller.

"I do remember it being a struggle... All the kit is very heavy because it has to sit on the sea bed and not move for long periods of time."

As well as the practicalities of setting up the equipment, the filmmakers had to contend with interference from the local wildlife.

The large weddell seals in the area had no problems barging past and breaking off brinicles as well as the filming equipment.

"The first time I did a timelapse at the spot a seal knocked it over," said Mr Miller.

But the team's efforts were eventually rewarded with the first ever footage of a brinicle forming.
ocean1 发表于 2011-12-2 16:52:45 | 显示全部楼层
Amazing!
鼓浪愚民 发表于 2011-12-6 11:50:02 | 显示全部楼层
真的很像3D动画!
神奇。。。。
Blooade 发表于 2011-12-6 12:19:02 | 显示全部楼层
我在围脖上看到过这个视频,不过找不到了。。
ocean1 发表于 2011-12-6 12:54:07 | 显示全部楼层
我在围脖上看到过这个视频,不过找不到了。。
Blooade 发表于 2011-12-6 12:19


视频见帖子“冰柱杀手”http://www.joyocean.org/viewthread.php?tid=1815
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