Recent summers have seen on average less ice floating in the Arctic Ocean.

近年夏天通常见到更少的冰漂浮在北冰洋上。

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One of the important ingredients of the new model is data on the thickness of ice floating on the sea.

一个最为主要的组成部分是海面冰层的厚度也加入到模型的演算当中。

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This time of year, they should be foraging from the sea ice floating over the productive waters of the continental shelf.

往年这个时候，它们应该在漂浮在这片大陆架地区食物丰富的海域上的冰面上捕食。

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Ice shelves are floating ice sheets attached to the coast.

CNN: Massive ice shelf on verge of breakup

The Norwegians send teams out on to the floating ice to drill holes into it and extract cores to determine the ice's origin.

BBC: Arctic ice melting at 'amazing' speed, scientists find

They spend most of their time on sea ice, this cap of ice that is floating around on the surface of the Arctic Ocean.

CNN: Polar bear now listed as 'threatened' species