Investigations of thermokarst development and climatic change in the Yukon Territory
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Investigations of thermokarst development, ground ice conditions and climate change in the Stewart and Takhini River Valleys, Yukon Territory are reported. Core drilling to 5 m revealed extensive ground ice in glacio-lacustrine clays in the Stewart Valley. The development of two retrogressive thaw-flow slides is reconstructed with air photographs, and studies of seasonal activity are reported. Maximum rates of retreat occur during rainstorms when surface debris accumulation is prevented. Pond development is also reconstructed with air photographs, and by cross-dating of ring series from submerged trees. The ponds were initiated around 1880, and at present are growing at a constant rate. A numerical simulation of the effects of climate change and fire on ground thermal regime indicates that fire produces a greater change in surface temperature than a climatic warming of 2°C. The features in the Stewart Valley are associated with the post-1850 warming, while the Takhini features have recently enlarged, following a forest fire.
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This work is available on request. You can request a copy at https://library.carleton.ca/forms/request-pdf-copy-thesis
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Copyright © 1983 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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- 1983
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