Cryosphere Now: Permafrost and Seasonally Frozen Ground
The most recent frozen ground information is given below. Hover over a thumbnail to get the full image, description, and credits. Note, however, that permfrost changes slowly, so the information provided here may only be updated annually or semi-annually. Important: The products shown on the "Cryosphere Now" pages provide a variety of perspectives on the state of the cryosphere. They are for purposes of illustration and comparison and are not necessarily endorsed by GCW as "authoritative".
Percent Changes in active layer thickness (ALT) relative to the 1991-2014 average for 7 differeent Arctic regions. The lower right table documents the populations of measurement sites used to create corresponding time series.