Impacts of retrogressive permafrost thaw slumps on aquatic systems in the Peel Plateau, Northwest Territories, Canada
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Along the slopes of the Richardson Mountains, west of the Mackenzie Delta in the Northwest Territories of Canada, the stratigraphies of two lakes with large retrogressive thaw slumps within their catchments are examined using paleolimnological techniques. The lacustrine geomorphological impacts of current thaw activity are examined, as well as the past occurrence of large-scale thermokarst disturbances. Sediment stratigraphies from the larger lake suggest repeated erosion through time. The sediment stratigraphy from the smaller lake records ~55 cm of deposition due to thaw slump activity in the past 20 – 40 years. Aside from the recent thaw slump activity recorded in the smaller lake basin, neither system provided discernable evidence of long-term, ancient slump activity. The difference in the magnitude of impacts of the two systems is primarily attributed to catchment area to lake area and disturbance area to lake area ratios.
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Copyright © 2015 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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delaney-impactsofretrogressivepermafrostthawslumps.pdf | 2023-05-04 | Public | Download |