Using Ice and Sediment Cores to Quantify Climate-warming Induced Inputs of Legacy Mercury to Lake Hazen, Nunavut
Mercury (Hg) is a globally dispersed contaminant that can bioaccumulate and biomagnify in food-webs. This research uses a unique combination of measurements in an ice core and a sediment core collected within the same watershed (Lake Hazen, Nunavut) to determine how the relative importance of Hg inp...
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ftunivtoronto:oai:tspace.library.utoronto.ca:1807/109245 2023-05-15T14:55:14+02:00 Using Ice and Sediment Cores to Quantify Climate-warming Induced Inputs of Legacy Mercury to Lake Hazen, Nunavut Lemire, Danielle Lehnherr, Igor Geography 2021-11-30T19:24:38Z application/pdf http://hdl.handle.net/1807/109245 unknown University of Toronto http://hdl.handle.net/1807/109245 Arctic Climate change Contaminants Ice core Methylmercury Total Mercury 0368 Thesis 2021 ftunivtoronto 2021-12-05T18:17:14Z Mercury (Hg) is a globally dispersed contaminant that can bioaccumulate and biomagnify in food-webs. This research uses a unique combination of measurements in an ice core and a sediment core collected within the same watershed (Lake Hazen, Nunavut) to determine how the relative importance of Hg inputs from atmospheric, glacier and terrestrial sources has changed over the last century. Hg accumulation in Lake Hazen sediment began increasing dramatically in the mid- 1990s, exhibiting a decoupling from atmospheric sources (as estimated from the ice core record), due to the increased importance of remobilized terrestrial Hg inputs to Lake Hazen. Increasing glacier melt and permafrost thaw slumping have increased the delivery of catchment Hg, via glacial rivers, into Lake Hazen. These results show that climate change is likely to slow the recovery of glacierized Arctic watersheds from Hg contamination, countering the anticipated benefit from recent international efforts to reduce anthropogenic Hg emissions. M.Sc. Thesis Arctic Climate change Ice ice core Lake Hazen Nunavut permafrost University of Toronto: Research Repository T-Space Arctic Lake Hazen ENVELOPE(-71.017,-71.017,81.797,81.797) Nunavut |
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Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
unknown |
topic |
Arctic Climate change Contaminants Ice core Methylmercury Total Mercury 0368 |
spellingShingle |
Arctic Climate change Contaminants Ice core Methylmercury Total Mercury 0368 Lemire, Danielle Using Ice and Sediment Cores to Quantify Climate-warming Induced Inputs of Legacy Mercury to Lake Hazen, Nunavut |
topic_facet |
Arctic Climate change Contaminants Ice core Methylmercury Total Mercury 0368 |
description |
Mercury (Hg) is a globally dispersed contaminant that can bioaccumulate and biomagnify in food-webs. This research uses a unique combination of measurements in an ice core and a sediment core collected within the same watershed (Lake Hazen, Nunavut) to determine how the relative importance of Hg inputs from atmospheric, glacier and terrestrial sources has changed over the last century. Hg accumulation in Lake Hazen sediment began increasing dramatically in the mid- 1990s, exhibiting a decoupling from atmospheric sources (as estimated from the ice core record), due to the increased importance of remobilized terrestrial Hg inputs to Lake Hazen. Increasing glacier melt and permafrost thaw slumping have increased the delivery of catchment Hg, via glacial rivers, into Lake Hazen. These results show that climate change is likely to slow the recovery of glacierized Arctic watersheds from Hg contamination, countering the anticipated benefit from recent international efforts to reduce anthropogenic Hg emissions. M.Sc. |
author2 |
Lehnherr, Igor Geography |
format |
Thesis |
author |
Lemire, Danielle |
author_facet |
Lemire, Danielle |
author_sort |
Lemire, Danielle |
title |
Using Ice and Sediment Cores to Quantify Climate-warming Induced Inputs of Legacy Mercury to Lake Hazen, Nunavut |
title_short |
Using Ice and Sediment Cores to Quantify Climate-warming Induced Inputs of Legacy Mercury to Lake Hazen, Nunavut |
title_full |
Using Ice and Sediment Cores to Quantify Climate-warming Induced Inputs of Legacy Mercury to Lake Hazen, Nunavut |
title_fullStr |
Using Ice and Sediment Cores to Quantify Climate-warming Induced Inputs of Legacy Mercury to Lake Hazen, Nunavut |
title_full_unstemmed |
Using Ice and Sediment Cores to Quantify Climate-warming Induced Inputs of Legacy Mercury to Lake Hazen, Nunavut |
title_sort |
using ice and sediment cores to quantify climate-warming induced inputs of legacy mercury to lake hazen, nunavut |
publisher |
University of Toronto |
publishDate |
2021 |
url |
http://hdl.handle.net/1807/109245 |
long_lat |
ENVELOPE(-71.017,-71.017,81.797,81.797) |
geographic |
Arctic Lake Hazen Nunavut |
geographic_facet |
Arctic Lake Hazen Nunavut |
genre |
Arctic Climate change Ice ice core Lake Hazen Nunavut permafrost |
genre_facet |
Arctic Climate change Ice ice core Lake Hazen Nunavut permafrost |
op_relation |
http://hdl.handle.net/1807/109245 |
_version_ |
1766327025947115520 |