Mapping Degrading Dendritic Peat Plateaus, NWT, Canada

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Alexandre Chiasson
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In the discontinuous permafrost zone, thermokarst lakes and thermal erosion are widespread and common permafrost thaw-related phenomena. Thermokarst features are indicative of thaw sensitive permafrost terrain and can lead to reduced ground stability and changes in landscape and drainage configuration. Degrading dendritic peat plateau near Mackenzie Mountains. Peatland permafrost features, including peat plateaus and palsas, are particularly vulnerable to thaw in response to global warming because frozen organic materials consolidate when thawed and typically overly ice rich mineral deposits. Peat plateaus dissected by dendritic fluvial and fen networks are common landforms in the central Mackenzie Valley, Northwest Territories. These networks tend to be associated with gradually sloping terrain (up to ~3m per km) and develop primarily on moraines and glaciolacustrine sediments, hosting segregated ground ice. To our knowledge, no studies have been conducted on the origin of dendritic peat plateau networks. The central Mackenzie Valley is characterized by discontinuous permafrost with low to medium ice content. Borehole records, and semi-remote sensing approach were carried out to describe morphology and permafrost. Fens and bogs are present within the dendritic peat plateau. conditions associated with dendritic peat plateau networks.