Earlier this year, scientists warned that sea ice volume reached a record low in 2008 due to an unusually high proportion of the thinner first year ice.
今年的早些时候，科学家们曾发出警告，因为较薄的“一年冰”的比例高于往常，2008年海面冰层的总量会跌至历史新低。
The first map, shown below, shows the average thickness of the sea-ice in January and February this year, as the ice approached its annual maximum.
下方的第一幅地图显示了今年一、二月海冰的平均厚度，当时正值冰盖到达每年最厚的时候。
THE first map of Arctic sea-ice thickness has been produced using data from CryoSat-2 (pictured), a satellite launched by the European Space Agency (ESA) in April last year.
第一幅北冰洋海冰厚度地图已经制作完成，使用的数据来自欧洲太空总署(ESA)去年四月发射的CryoSat-2卫星（见图片）。
In March 1979, the first year for which satellite records are available, the sea ice in the Arctic Ocean covered 16.4m square kilometres (6.4m square miles).
1979年3月，卫星摄影技术发明之初，北冰洋海域覆盖着1640万平方公里(640万平方英里)的冰层。
In March 1979, the first year for which satellite records are available, the sea ice in the Arctic Ocean covered 16.4m square kilometres (6.4m square miles).
1979年3月，卫星摄影技术发明之初，北冰洋海域覆盖着1640万平方公里(640万平方英里)的冰层。
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