mean annual ground-surface temperature (MAGST)
Link: http://w3id.org/permafrost/v/ipaglossary/t0203
Within: IPA Permafrost Glossary
Definition: Mean annual temperature of the surface of the ground.
| Term |
mean annual ground-surface temperature (MAGST)
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| Comment |
Permafrost exists if the mean annual ground-surface temperature is perennially below 0°C. Although the mean annual surface temperature may be below 0°C, the surface temperature will fluctuate during the year, causing a layer of ground immediately beneath the surface to thaw in the summer and freeze in the winter (the active layer). Small changes in the annual range of surface temperature and in the mean annual surface temperature from year to year, or over a period of a few years, may cause a layer of ground between the bottom of the active layer and the permafrost table to remain at a temperature above 0°C, creating a talik or residual thaw layer.
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| dcterms:source |
https://doi.org/10.4224/20386561
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