Spatial and Temporal Variability of Lake Accumulation Rates in Subarctic Northwest Territories, Canada
We examined the spatial and temporal variability of Holocene lake sediment accumulation at 22 sites from 18 lakes transecting boreal forest, tree line, and tundra zones in the central Northwest Territories, Canada. Over 140 radiocarbon dates were obtained, and accumulation rates (AR) were calculated...
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ftcarletonuniv:oai:curve.carleton.ca:15136 2023-05-15T17:46:31+02:00 Spatial and Temporal Variability of Lake Accumulation Rates in Subarctic Northwest Territories, Canada Crann, Carley Angela 2013 https://curve.carleton.ca/9f7c829b-06de-4bfc-bae5-37866d5ab606 http://catalogue.library.carleton.ca/record=b3524434 https://doi.org/10.22215/etd/2013-09935 unknown https://curve.carleton.ca/9f7c829b-06de-4bfc-bae5-37866d5ab606 http://catalogue.library.carleton.ca/record=b3524434 https://doi.org/10.22215/etd/2013-09935 Thesis/Dissertation 2013 ftcarletonuniv https://doi.org/10.22215/etd/2013-09935 2022-01-23T08:26:04Z We examined the spatial and temporal variability of Holocene lake sediment accumulation at 22 sites from 18 lakes transecting boreal forest, tree line, and tundra zones in the central Northwest Territories, Canada. Over 140 radiocarbon dates were obtained, and accumulation rates (AR) were calculated at 100-year intervals from age-depth models constructed using the modeling software Clam. Sites with the shortest mean AR of 25±10yr/cm(1σ) occur primarily in the boreal zone. Sites with moderate (70±22yr/cm) and long (160±56yr/cm) AR are north of the treeline and display higher variability, strongly influenced by bathymetry. Many age-depth models are characterized by fluctuations in ARs that coincide with paleogeographical changes associated with proglacial lake evolution during the early Holocene, and subsequent climate changes inferred from proxy data. The insights gained on the spatial and temporal trends in ARs across the region are valuable for developing higher resolution age-depth models using the Bayesian software Bacon. Thesis Northwest Territories Subarctic Tundra CURVE - Carleton University Research Virtual Environment Canada Northwest Territories |
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Open Polar |
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CURVE - Carleton University Research Virtual Environment |
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ftcarletonuniv |
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unknown |
description |
We examined the spatial and temporal variability of Holocene lake sediment accumulation at 22 sites from 18 lakes transecting boreal forest, tree line, and tundra zones in the central Northwest Territories, Canada. Over 140 radiocarbon dates were obtained, and accumulation rates (AR) were calculated at 100-year intervals from age-depth models constructed using the modeling software Clam. Sites with the shortest mean AR of 25±10yr/cm(1σ) occur primarily in the boreal zone. Sites with moderate (70±22yr/cm) and long (160±56yr/cm) AR are north of the treeline and display higher variability, strongly influenced by bathymetry. Many age-depth models are characterized by fluctuations in ARs that coincide with paleogeographical changes associated with proglacial lake evolution during the early Holocene, and subsequent climate changes inferred from proxy data. The insights gained on the spatial and temporal trends in ARs across the region are valuable for developing higher resolution age-depth models using the Bayesian software Bacon. |
format |
Thesis |
author |
Crann, Carley Angela |
spellingShingle |
Crann, Carley Angela Spatial and Temporal Variability of Lake Accumulation Rates in Subarctic Northwest Territories, Canada |
author_facet |
Crann, Carley Angela |
author_sort |
Crann, Carley Angela |
title |
Spatial and Temporal Variability of Lake Accumulation Rates in Subarctic Northwest Territories, Canada |
title_short |
Spatial and Temporal Variability of Lake Accumulation Rates in Subarctic Northwest Territories, Canada |
title_full |
Spatial and Temporal Variability of Lake Accumulation Rates in Subarctic Northwest Territories, Canada |
title_fullStr |
Spatial and Temporal Variability of Lake Accumulation Rates in Subarctic Northwest Territories, Canada |
title_full_unstemmed |
Spatial and Temporal Variability of Lake Accumulation Rates in Subarctic Northwest Territories, Canada |
title_sort |
spatial and temporal variability of lake accumulation rates in subarctic northwest territories, canada |
publishDate |
2013 |
url |
https://curve.carleton.ca/9f7c829b-06de-4bfc-bae5-37866d5ab606 http://catalogue.library.carleton.ca/record=b3524434 https://doi.org/10.22215/etd/2013-09935 |
geographic |
Canada Northwest Territories |
geographic_facet |
Canada Northwest Territories |
genre |
Northwest Territories Subarctic Tundra |
genre_facet |
Northwest Territories Subarctic Tundra |
op_relation |
https://curve.carleton.ca/9f7c829b-06de-4bfc-bae5-37866d5ab606 http://catalogue.library.carleton.ca/record=b3524434 https://doi.org/10.22215/etd/2013-09935 |
op_doi |
https://doi.org/10.22215/etd/2013-09935 |
_version_ |
1766150221799096320 |