极地气候变化

了解气候变化如何影响极地地区——自1979年以来，北极海冰急剧减少（大约每十年减少13%），格陵兰和南极冰盖的质量正在减少并导致海平面上升，永久冻土正在解冻并释放甲烷（一种强效温室气体）。这些变化会形成正反馈循环：融化导致更多变暖，而更多变暖又导致更多融化。

Understand how climate change is affecting polar regions — Arctic sea ice is shrinking dramatically (losing about 13% per decade since 1979), the Greenland and Antarctic ice sheets are losing mass and contributing to sea level rise, permafrost is thawing and releasing methane (a powerful greenhouse gas), and these changes create positive feedback loops where melting leads to more warming which leads to more melting

学习证据 / Evidence

• 指出自1979年以来，北极海冰大约每十年减少13%。
• 解释正反馈循环：变暖导致冰融化，深色海水吸收更多热量，导致进一步变暖，进而导致更多融化。
• 描述极地冰消失的至少两个后果：海平面上升和永久冻土融化释放甲烷。

• State that Arctic sea ice has been declining at roughly 13% per decade since 1979
• Explain the positive feedback loop: warming → ice melts → dark ocean absorbs more heat → more warming → more melting
• Describe at least two consequences of polar ice loss: sea level rise and permafrost thawing releasing methane

评估问题 / Assessment

{{name}}能解释气候变化是怎样融化极地冰的吗——也就是说，北极海冰正在缩小，冰盖质量正在减少，而且融化实际上会引发更多融化，形成恶性循环？

Can {{name}} explain how climate change is melting polar ice — that Arctic sea ice is shrinking, ice sheets are losing mass, and that melting actually makes more melting happen in a vicious cycle?