Diatom Records of Holocene Climatic and Hydrological Changes in the Western Hudson Bay Region, Canada
Rapidly changing climates in northern Canada make the western Hudson Bay region an area of high importance for paleoenvironmental studies. Long-term changes in assemblages of diatoms (microscopic algae) were analyzed from lake sediment cores from Baker Lake, Nunavut, and Lake AT01, northern Ontario,...
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ftunivtoronto:oai:localhost:1807/30595 2023-05-15T15:35:53+02:00 Diatom Records of Holocene Climatic and Hydrological Changes in the Western Hudson Bay Region, Canada Friel, Charlotte Finkelstein, Sarah A. Geography NO_RESTRICTION http://hdl.handle.net/1807/30595 en_ca eng http://hdl.handle.net/1807/30595 Diatoms Hudson Bay Lowlands paleoclimatology paleolimnology climate hydrology 0426 Thesis ftunivtoronto 2020-06-17T11:20:56Z Rapidly changing climates in northern Canada make the western Hudson Bay region an area of high importance for paleoenvironmental studies. Long-term changes in assemblages of diatoms (microscopic algae) were analyzed from lake sediment cores from Baker Lake, Nunavut, and Lake AT01, northern Ontario, to track responses to past environmental changes. Diatom assemblages dating to 6700 years ago in AT01 were initially characterized by cold- tolerant Fragilarioid assemblages, but shifted to an assemblage dominated by large benthic species and Cymbella diluviana consistent with the timing of the Holocene Thermal Maximum after 6300 years BP. A possible drainage event in Lake AT01 may have added significant hydrologic control on the diatom assemblages. The post-industrial period is marked by the largest compositional shifts in both records. Assemblages during the 20th century are indicative of reduced ice cover and enhanced thermal stratification linked to a climate regime shift noted in Hudson Bay since the mid-1990’s. MAST Thesis Baker Lake Hudson Bay Nunavut University of Toronto: Research Repository T-Space Nunavut Hudson Bay Canada Hudson |
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Open Polar |
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University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
English |
topic |
Diatoms Hudson Bay Lowlands paleoclimatology paleolimnology climate hydrology 0426 |
spellingShingle |
Diatoms Hudson Bay Lowlands paleoclimatology paleolimnology climate hydrology 0426 Friel, Charlotte Diatom Records of Holocene Climatic and Hydrological Changes in the Western Hudson Bay Region, Canada |
topic_facet |
Diatoms Hudson Bay Lowlands paleoclimatology paleolimnology climate hydrology 0426 |
description |
Rapidly changing climates in northern Canada make the western Hudson Bay region an area of high importance for paleoenvironmental studies. Long-term changes in assemblages of diatoms (microscopic algae) were analyzed from lake sediment cores from Baker Lake, Nunavut, and Lake AT01, northern Ontario, to track responses to past environmental changes. Diatom assemblages dating to 6700 years ago in AT01 were initially characterized by cold- tolerant Fragilarioid assemblages, but shifted to an assemblage dominated by large benthic species and Cymbella diluviana consistent with the timing of the Holocene Thermal Maximum after 6300 years BP. A possible drainage event in Lake AT01 may have added significant hydrologic control on the diatom assemblages. The post-industrial period is marked by the largest compositional shifts in both records. Assemblages during the 20th century are indicative of reduced ice cover and enhanced thermal stratification linked to a climate regime shift noted in Hudson Bay since the mid-1990’s. MAST |
author2 |
Finkelstein, Sarah A. Geography |
format |
Thesis |
author |
Friel, Charlotte |
author_facet |
Friel, Charlotte |
author_sort |
Friel, Charlotte |
title |
Diatom Records of Holocene Climatic and Hydrological Changes in the Western Hudson Bay Region, Canada |
title_short |
Diatom Records of Holocene Climatic and Hydrological Changes in the Western Hudson Bay Region, Canada |
title_full |
Diatom Records of Holocene Climatic and Hydrological Changes in the Western Hudson Bay Region, Canada |
title_fullStr |
Diatom Records of Holocene Climatic and Hydrological Changes in the Western Hudson Bay Region, Canada |
title_full_unstemmed |
Diatom Records of Holocene Climatic and Hydrological Changes in the Western Hudson Bay Region, Canada |
title_sort |
diatom records of holocene climatic and hydrological changes in the western hudson bay region, canada |
publishDate |
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url |
http://hdl.handle.net/1807/30595 |
geographic |
Nunavut Hudson Bay Canada Hudson |
geographic_facet |
Nunavut Hudson Bay Canada Hudson |
genre |
Baker Lake Hudson Bay Nunavut |
genre_facet |
Baker Lake Hudson Bay Nunavut |
op_relation |
http://hdl.handle.net/1807/30595 |
_version_ |
1766366234350190592 |