这些读数显示了冰层隆起有多厚，相互间倾斜角度有多大，从而提供了底层冰盖的形状。
The readings show how thin layers of ice bulge and tilt in relation to each other, which offers clues to the shape of the underlying ice sheet.
图片是过去十年间由美国间谍卫星拍摄的，它们证实了，在最近几年，大面积高纬度区域在夏天失去了冰层的覆盖。
The photographs, taken by spy satellites over the past decade, confirm that in recent years vast areas in high latitudes have lost their ice cover in summer months.
这项报告预测北极海洋在30或40年间有可能会在夏季的那几个月里变成没有冰层覆盖的海面。
The report forecasts that the Arctic Ocean, within three or four decades, will likely become nearly ice free during the summer months.
在过去的几十年间，北极圈的低温把具有挥发性的Pops冻结封存在冰层和北极冰冷的海水中。
Over past decades, the low temperatures in the Arctic trapped volatile Pops in ice and cold water.
在过去的十年间，冰层已经不再大量增加，冰川随时可能发生崩坍，这会导致全球海平面上升24厘米。
After losing increasing amounts of ice over the past decades, it is poised to collapse in a catastrophe that could raise global sea levels by 24 centimetres.
在过去的十年间，冰层已经不再大量增加，冰川随时可能发生崩坍，这会导致全球海平面上升24厘米。
After losing increasing amounts of ice over the past decades, it is poised to collapse in a catastrophe that could raise global sea levels by 24 centimetres.
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