Scientists with the University of Alaska Fairbanks, U.S. Geological Survey and other institutions have documented 56 beaver complexes that have been built since 1999 along rivers and creeks in Arctic northwestern Alaska.
Methane bursts from frozen tundra as winter sets in.
As the autumn cold begins to bite in the Arctic tundra, the freezing ground releases a large and unexpected burst of methane into the air. The emissions, thought to be squeezed out by the growth of surface frost, match up with an atmospheric methane surge that had previously gone unexplained.
Unexpected future boost of methane possible from Arctic permafrost
New NASA-funded research has discovered that Arctic permafrost’s expected gradual thawing and the associated release of greenhouse gases to the atmosphere may actually be sped up by instances of a relatively little known process called abrupt thawing.
