Carbon-14 as a Tracer of Soil Movement in Earth Hummocks: A Case Study From Northwestern Arctic Canada
Involuted soil horizons and buried organic matter in the active layer and near-surface permafrost provide evidence that soil movement or cryoturbation is occurring within the active layer in hummocky terrain. Cryoturbation in the active layer of permafrost-affected soils could have significant impli...
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Université d'Ottawa / University of Ottawa
2016
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ftdatacite:10.20381/ruor-5742 2023-05-15T14:58:36+02:00 Carbon-14 as a Tracer of Soil Movement in Earth Hummocks: A Case Study From Northwestern Arctic Canada Main, Brittany 2016 https://dx.doi.org/10.20381/ruor-5742 http://www.ruor.uottawa.ca/handle/10393/34581 en eng Université d'Ottawa / University of Ottawa Arctic Canada hummocks cryoturbation radiocarbon Text Thesis article-journal ScholarlyArticle 2016 ftdatacite https://doi.org/10.20381/ruor-5742 2021-11-05T12:55:41Z Involuted soil horizons and buried organic matter in the active layer and near-surface permafrost provide evidence that soil movement or cryoturbation is occurring within the active layer in hummocky terrain. Cryoturbation in the active layer of permafrost-affected soils could have significant implications in sequestering carbon, including trace metals and contaminants that are absorbed onto organic matter. Though several hummock development theories exist, there has thus far been limited evidence to support them; similarly, few studies have been able to establish hummock age. This study aimed to contribute radiocarbon-dated ages of buried organics in both the active layer and permafrost, as well as provide evidence for the convective cell/equilibrium model and the collapse model. Trenches were dug along a transect at two well-developed hummock sites in the Mackenzie Delta near Inuvik, NWT. Active layer and permafrost samples were analyzed for distribution of gravimetric water content (GWC), organic matter, inorganic carbon, and carbon-14 (C14). Results determined material ranged in age from the modern period (1959-1987AD) to 2300 yr BP with a generally normal distribution. Buried organics within the active layer ranged from 557-670 yr BP and 1023-1240 yr BP, with average displacement rates of 0.43 mm/yr and 0.16 mm/yr, respectively. These results suggest the convective cell/equilibrium and hummock collapse models can function simultaneously. Thesis Arctic Inuvik Mackenzie Delta permafrost DataCite Metadata Store (German National Library of Science and Technology) Arctic Canada Inuvik ENVELOPE(-133.610,-133.610,68.341,68.341) Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Arctic Canada hummocks cryoturbation radiocarbon |
spellingShingle |
Arctic Canada hummocks cryoturbation radiocarbon Main, Brittany Carbon-14 as a Tracer of Soil Movement in Earth Hummocks: A Case Study From Northwestern Arctic Canada |
topic_facet |
Arctic Canada hummocks cryoturbation radiocarbon |
description |
Involuted soil horizons and buried organic matter in the active layer and near-surface permafrost provide evidence that soil movement or cryoturbation is occurring within the active layer in hummocky terrain. Cryoturbation in the active layer of permafrost-affected soils could have significant implications in sequestering carbon, including trace metals and contaminants that are absorbed onto organic matter. Though several hummock development theories exist, there has thus far been limited evidence to support them; similarly, few studies have been able to establish hummock age. This study aimed to contribute radiocarbon-dated ages of buried organics in both the active layer and permafrost, as well as provide evidence for the convective cell/equilibrium model and the collapse model. Trenches were dug along a transect at two well-developed hummock sites in the Mackenzie Delta near Inuvik, NWT. Active layer and permafrost samples were analyzed for distribution of gravimetric water content (GWC), organic matter, inorganic carbon, and carbon-14 (C14). Results determined material ranged in age from the modern period (1959-1987AD) to 2300 yr BP with a generally normal distribution. Buried organics within the active layer ranged from 557-670 yr BP and 1023-1240 yr BP, with average displacement rates of 0.43 mm/yr and 0.16 mm/yr, respectively. These results suggest the convective cell/equilibrium and hummock collapse models can function simultaneously. |
format |
Thesis |
author |
Main, Brittany |
author_facet |
Main, Brittany |
author_sort |
Main, Brittany |
title |
Carbon-14 as a Tracer of Soil Movement in Earth Hummocks: A Case Study From Northwestern Arctic Canada |
title_short |
Carbon-14 as a Tracer of Soil Movement in Earth Hummocks: A Case Study From Northwestern Arctic Canada |
title_full |
Carbon-14 as a Tracer of Soil Movement in Earth Hummocks: A Case Study From Northwestern Arctic Canada |
title_fullStr |
Carbon-14 as a Tracer of Soil Movement in Earth Hummocks: A Case Study From Northwestern Arctic Canada |
title_full_unstemmed |
Carbon-14 as a Tracer of Soil Movement in Earth Hummocks: A Case Study From Northwestern Arctic Canada |
title_sort |
carbon-14 as a tracer of soil movement in earth hummocks: a case study from northwestern arctic canada |
publisher |
Université d'Ottawa / University of Ottawa |
publishDate |
2016 |
url |
https://dx.doi.org/10.20381/ruor-5742 http://www.ruor.uottawa.ca/handle/10393/34581 |
long_lat |
ENVELOPE(-133.610,-133.610,68.341,68.341) ENVELOPE(-136.672,-136.672,68.833,68.833) |
geographic |
Arctic Canada Inuvik Mackenzie Delta |
geographic_facet |
Arctic Canada Inuvik Mackenzie Delta |
genre |
Arctic Inuvik Mackenzie Delta permafrost |
genre_facet |
Arctic Inuvik Mackenzie Delta permafrost |
op_doi |
https://doi.org/10.20381/ruor-5742 |
_version_ |
1766330734093533184 |