Human activity may have influence on the concentration of ice nucleus.

人类活动对冰核浓度也有影响。

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Gradually as the concentration of greenhouse gases goes down, Earth starts to cool again, and eventually you slip back into an Ice Age.

随着温室气体浓度的下降，地球开始再次变冷，最终又将回到冰河时代。

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The formation of sea ice causes the concentration of salt in surface waters to increase; less sea ice would mean a smaller increase in the concentration of salt.

海冰的形成导致表水中盐的浓度增加；海冰的减少意味着盐浓度的增加幅度较小。

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The area is prone to changes in winds and local currents, and ships can quickly become trapped, sometimes for weeks, when the concentration of pack ice increases.

BBC: HMS Protector approaches MS Fram