It does it for one reason: to clear a path for other vessels, so they can take advantage of the frozen Arctic.

它在北极的破冰只有一个原因：为其它船只清理出一条路线，使他们能开发利用冰冻的北极。

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As it remained clear for longer than usual it also bled more heat into the Arctic atmosphere. This caused higher air pressures, reducing the gradient between the Iceland low and the Azores high.

当它在比以前更长的时间里保持不结冰的状态，它也会将更多的热量输入北极区的大气层，这就使北极区的气压变高，使冰岛低压和亚速尔高压之间的梯度变小。

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Clear skies in late June 2010 provided plenty of unfiltered sunlight to melt snow and ice in the Arctic.

2010年6月下旬的晴朗天空提供了大量未过滤的阳光来融化北极的冰雪。

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Average monthly Arctic sea ice extent data shows a clear deceasing trend since 1979.

UNESCO: Social and Human Sciences

Diary entries of a sailor named Roald Amundson confirm clear passage in 1903, as do those of a Royal Canadian Mounted Police Arctic patrol crew that made regular trips through there in the early 1940s.

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