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）。
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