Indeed, for the Arctic as a whole, the melt season started with even more thin ice than in 2007, hence concerns that we may even beat last year's sea-ice minimum.

确实，把北极看作一个整体，融化季节开始的时候，海冰总量比2007年还要少，因此可能会突破去年海冰量的最低点。

youdao

They show Arctic sea ice extent for the September 2009 minimum (left) and March 2010 maximum (right).

它显示的是北极海洋结冰程度在2009年9月的最低值(左)和2010年3月的最高值(右)。

youdao

The analysis produced a summer Arctic sea-ice minimum extent of 6.9 million sq km.

BBC: Earliest satellite maps of Antarctic and Arctic sea-ice

Each year, the Arctic sea ice reaches its minimum extent in September.

UNESCO: EDUCATION

Climate change models of Arctic sea ice cover in September, the month when ice is usually at its minimum, suggest an average loss of 2.5 percent of ice cover per decade from 1953 to 2003.

CNN: Arctic melt worse than predictions