Modelling the significance of snow-vegetation interactions for active layer dynamics in an Arctic permafrost region subjected to tundra shrubification ...

• Main Author: Haagmans, Vincent
• Format: Text
• Language: English
• Published: ETH Zurich 2021
• Subjects: Permafrost; Active layer; CryoGrid; shrubification; snow-vegetation processes; infoeu-repo/classification/ddc/500; Natural sciences; FOS Natural sciences; Arctic; Climate change; permafrost; Tundra
• Online Access: https://dx.doi.org/10.3929/ethz-b-000518127; http://hdl.handle.net/20.500.11850/518127

Permafrost is warming globally and the extent of this warming is locally variable in space and time due to an array of factors. In the Arctic, vegetation is one of these factors, whichever influenced by climate change is undergoing a transformation through an increase in height and extent of shrubs on the tundra. In turn, changes in vegetation also alter the thermal properties of the snow cover in winter due to processes like snow trapping; potentially further warming permafrost. However, permafrost models have been limited in the combined representation of small-scale spatial variability of snow and vegetation. By combining the CryoGrid permafrost model with observed characteristics of local snow cover, vegetation, and soil stratigraphies, the present work investigates the spatial heterogeneity of permafrost active layer dynamics in Siksik Creek, NW Canada. The modelling efforts indicate that vegetation-induced increased insulation capacity of snow cover in winter, has the potential to directly influence ...