The Antarctic Ice Sheet is losing mass at an accelerating pace, and ice loss will likely continue over the coming decades and centuries. Some regions of the ice sheet may reach a tipping point, potentially leading to rates of sea level rise at least an order of magnitude larger than those observed now, owing to strong positive feedbacks in the ice-climate system. How fast and how much Antarctica will contribute to sea level remains uncertain, but multimeter sea level rise is likely for a mean global temperature increase of around 2°C above preindustrial levels on multicentennial time scales, or sooner for unmitigated scenarios.

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南极冰盖的不确定未来

南极冰盖的质量正在加速流失，在未来几十年和几个世纪里，冰层流失可能会继续下去。由于冰气候系统的强烈正反馈，冰盖的某些区域可能会达到临界点，这可能导致海平面上升速度至少比现在观察到的高一个数量级。南极洲对海平面的贡献有多快和有多大仍然不确定，但万用表海平面上升可能会导致全球平均气温在数百年时间尺度上比工业化前水平高出约 2°C，或者在未缓解的情况下更快。