南极地表大范围的常年不融化的冰雪覆盖。南极冰盖始于渐新世末。至少在距今500万年前就达到目前规模。
现在，新的证据显示，在过去130万年中，全部的南极冰盖或其中大部分至少都崩塌过一次。
Now, new evidence reveals that all or most of the Antarctic ice sheet collapsed at least once during the past 1.3 million years.
南极地区的数据反映了南极冰盖质量的变化。
Measurements taken over the south pole reflect changes in the mass of the Antarctic ice sheets.
格陵兰岛与南极冰盖都在加速融化。
Both the Greenland and the Antarctic caps have been melting at an accelerating rate.
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