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Global Terrestrial Network for Permafrost
From Wikipedia, the free encyclopedia
The Global Terrestrial Network for Permafrost (GTN‐P) is the primary international programme concerned with monitoring permafrost parameters. GTN‐P was developed in the 1990s by the International Permafrost Association (IPA) under the Global Climate observing System (GCOS) and the Global Terrestrial Observing System (GTOS),[1] with the long-term goal of obtaining a comprehensive view of the spatial structure, trends and variability of changes in the active layer thickness and permafrost temperature.
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According to the GTN-P website, "GCOS and GTOS established 50 essential climate variables (ECVs),[2] of which one is permafrost. Within the GTN-P, involving the senior and young permafrost scientific community, two permafrost key variables have been identified as ECVs:[3][4]
- the thermal state of permafrost (TSP), which is permafrost temperature, long-term monitored by an extensive borehole network
- the active layer thickness (ALT), which is the annual thaw depth of permafrost, mostly referring to the monitoring network of Circumpolar Active Layer Monitoring (CALM)"[5]