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.

youdao

当海底存储的冰冻甲烷被暖流所融化时，气体甲烷会从海底大量释放。

There also seems to have been a large release of methane from the seabed when frozen methane stored there were thawed out by the warming.

youdao