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Increasing active layer thickness in the North

Active layer thickness (ALT) in the Northern Hemisphere has in average increased 0.65 cm per from 2000 to 2018. This mean value represents a significant increase within 71% of the total permafrost area; while the area with decreasing ALT accounted for 27% of the permafrost area. Chuanhua Li and co-workers has in a recent publication in Journal of Geophysical Research convincingly mapped the spatial distribution of changes in ALT. The most dramatic changes to come are mainly in the 30°N–50°N permafrost area, including northeastern Mongolia, the Qinghai-Tibet Plateau, the Tien Shan, the Altai Mountains, the Alps, and the southern Norway.

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