当永冻层融化，其中的有机物质分解就会释放甲烷。
Methane is released when organic material in the thawing permafrost decomposes, which gradually releases methane.
研究人员通过观测被称为泥炭丘的小丘来测量永冻带边界北退的程度，泥炭丘是在北部泥炭沼泽含冰的土壤上自然形成的。
The researchers measured the retreat of the permafrost border byobserving hummocks known as "palsas, " which form naturally over icecontained in the soil of northern peat bogs.
冰冻在永冻层中的甲烷也能随着永冻层的融化而释放。
It also can be released directly as stored methane already in the permafrost is released as it thaws.
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