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Assessment of the sediment and associated nutrient/contaminant continuum, from permafrost thaw slump scars to tundra lakes in the western Canadian Arctic

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  • Ian G. Droppo
  • Peter di Cenzo
  • Renee McFadyen
  • Thomas Reid

Abstract

Within the Canadian Arctic, vast areas of previously frozen sediments and carbon are being released into aquatic ecosystems via the occurrence of permafrost thaw and retrogressive thaw slumps (RTSs). While knowledge of mass wasting RTS processes are more advanced, the significance of exposed retrogressive thaw slump scars (RTSSs) at various phases of stabilization to yield additional large quantities of ecologically relevant sediment to lakes and rivers is not well constrained. Using laboratory simulation (linked rainfall and lake flow dynamics), RTS sediments were investigated to assess the sediment continuum from the terrestrial RTSSs to depositional zones within two Arctic tundra lakes. Using an estimate of 30% of the RTSS areas contributing sediment under hypothetical 20‐ and 100‐year rainfall events, up to 598 and 997 kg hr−1 of RTSS sediment washoff was projected respectively. Eroded particle size, regardless of lake or initial bulk RTSS size distribution, was dominated by individual clay particles (

Suggested Citation

  • Ian G. Droppo & Peter di Cenzo & Renee McFadyen & Thomas Reid, 2022. "Assessment of the sediment and associated nutrient/contaminant continuum, from permafrost thaw slump scars to tundra lakes in the western Canadian Arctic," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 33(1), pages 32-45, January.
    • Handle: RePEc:wly:perpro:v:33:y:2022:i:1:p:32-45
    DOI: 10.1002/ppp.2134
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    1. S. V. Kokelj & R. E. Jenkins & D. Milburn & C. R. Burn & N. Snow, 2005. "The influence of thermokarst disturbance on the water quality of small upland lakes, Mackenzie Delta region, Northwest Territories, Canada," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 16(4), pages 343-353, October.
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