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 problem is that much of that refreezing creates a relatively thin layer of so-called first-year ice.
问题是，重新冻结的冰很大程度上相对较薄，所以被称为“首年冰”。
Not just the first-year ice might go, but also some of the "rotten" multiyear ice that Barber encountered.
不只是首年冰会融化，而且一些巴贝遇到的那种“烂的”多年冰也会融化。
Estimates range from 2013-terrifyingly soon-to 2050 for the first year when the Arctic is free of ice in summer.
据推测，北极夏日无冰的开始年份，最早为急迫的2013年，最晚2050年。
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。
Every March since, the ice has returned to an annual maximum, but never again has it been as large as the one observed that first year.
之后每逢三月，冰层便会恢复至年度最高值，但从未达到1979年所观察的规模那样巨大。
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。
The researchers made a similar discovery in April this year when they discovered the first evidence of ice on an asteroid called 24 Themis.
研究人员今年4月有一个类似发现。他们当时发现，首次有证据证明，在一颗被称为司理星(24 Themis)的小行星上存在冰。
The 21-year-old has been snow sculpting for three years, ever since he first learned how to do it in an ice and snow sculpting class.
自从第一次在冰雪雕塑课上学会这门技艺以来，他已经从事雪雕艺术三年时间了。
The 21-year-old has been snow sculpting for three years, ever since he first learned how to do it in an ice and snow sculpting class.
自从第一次在冰雪雕塑课上学会这门技艺以来，他已经从事雪雕艺术三年时间了。
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