Using this graphic and referring to it is encouraged, and please use it in presentations, web pages, newspapers, blogs and reports.
For any form of publication, please include the link to this page and give the cartographer/designer credit (in this case Hugo Ahlenius, UNEP/GRID-Arendal)
V.E. Romanovsky, updated from Osterkamp, T. E. (2003). A thermal history of permafrost in Alaska, In: Phillips, M., Springman, S.M. and Arenson, L.U. eds. 8th International Conference on Permafrost, 20-25 July 2003, Zurich. Lisse, A.A. Balkema Publishers.
Uploaded on Tuesday 21 Feb 2012
Trends in permafrost temperatures during the last 23 to 28 years in northern Alaska
Hugo Ahlenius, UNEP/GRID-Arendal
There has been a general increase in permafrost temperatures during the last several decades in Alaska, northwest Canada, Siberia, and northern Europe. Permafrost temperature records have been obtained uninterrupted for more than 20 years along the International Geosphere-Biosphere Programme Alaskan transect, which spans the entire continuous permafrost zone in the Alaskan Arctic. Records from all locations along the transect show a substantial warming during this period. The permafrost typically warmed by 0.5 to 2°C, depending on location (see figure, temperatures are measured at 20 m depth, where there is no seasonal variation).