Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake
Abstract The seasonal development of an ice cover is a characteristic feature of subarctic lakes, yet the biogeochemical cycling of redox sensitive elements under ice, including arsenic (As), is poorly understood. We conducted comprehensive geochemical characterization of lake waters, sediment pore...
Published in: | Limnology and Oceanography |
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Online Access: | http://dx.doi.org/10.1002/lno.11556 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11556 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11556 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11556 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11556 |
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crwiley:10.1002/lno.11556 2024-09-15T18:37:52+00:00 Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake Palmer, Michael J. Chételat, John Jamieson, Heather E. Richardson, Murray Amyot, Marc Aurora Research Institute Natural Sciences and Engineering Research Council of Canada W. Garfield Weston Foundation 2020 http://dx.doi.org/10.1002/lno.11556 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11556 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11556 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11556 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11556 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 66, issue S1 ISSN 0024-3590 1939-5590 journal-article 2020 crwiley https://doi.org/10.1002/lno.11556 2024-07-09T04:09:49Z Abstract The seasonal development of an ice cover is a characteristic feature of subarctic lakes, yet the biogeochemical cycling of redox sensitive elements under ice, including arsenic (As), is poorly understood. We conducted comprehensive geochemical characterization of lake waters, sediment pore waters and lake sediments over two consecutive years to develop a conceptual model of As, iron (Fe), and sulfur (S) dynamics under ice in a shallow subarctic lake (mean depth 2.0 m) impacted by more than 60 yr of As pollution from local gold mining emissions. Lake sediments were a source of As to overlying waters during both winters when oxygen was depleted from interfacial sediments through the reductive dissolution of As‐bearing Fe (oxy)hydroxides, but the influence on lake water chemistry was distinctly different between years and dependent on winter hydrology of the lake. When the lake was hydrologically disconnected from the upstream watershed, anoxia developed through the entire water column and high concentrations of As (> 100 μ g L −1 ) and Fe (> 1000 μ g L −1 ) were measured in lake water. During the second winter, open‐water flow persisted at the lake inlet, which replenished dissolved oxygen in the under‐ice water column, suppressed the upward migration of the Fe and SO 4 redox boundaries, and limited sediment As efflux. These findings demonstrate how changing hydrology, specifically ice cover duration, and hydrological connectivity can influence the winter cycling of As, Fe, and S in shallow subarctic lakes. Article in Journal/Newspaper Subarctic Wiley Online Library Limnology and Oceanography 66 S1 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract The seasonal development of an ice cover is a characteristic feature of subarctic lakes, yet the biogeochemical cycling of redox sensitive elements under ice, including arsenic (As), is poorly understood. We conducted comprehensive geochemical characterization of lake waters, sediment pore waters and lake sediments over two consecutive years to develop a conceptual model of As, iron (Fe), and sulfur (S) dynamics under ice in a shallow subarctic lake (mean depth 2.0 m) impacted by more than 60 yr of As pollution from local gold mining emissions. Lake sediments were a source of As to overlying waters during both winters when oxygen was depleted from interfacial sediments through the reductive dissolution of As‐bearing Fe (oxy)hydroxides, but the influence on lake water chemistry was distinctly different between years and dependent on winter hydrology of the lake. When the lake was hydrologically disconnected from the upstream watershed, anoxia developed through the entire water column and high concentrations of As (> 100 μ g L −1 ) and Fe (> 1000 μ g L −1 ) were measured in lake water. During the second winter, open‐water flow persisted at the lake inlet, which replenished dissolved oxygen in the under‐ice water column, suppressed the upward migration of the Fe and SO 4 redox boundaries, and limited sediment As efflux. These findings demonstrate how changing hydrology, specifically ice cover duration, and hydrological connectivity can influence the winter cycling of As, Fe, and S in shallow subarctic lakes. |
author2 |
Aurora Research Institute Natural Sciences and Engineering Research Council of Canada W. Garfield Weston Foundation |
format |
Article in Journal/Newspaper |
author |
Palmer, Michael J. Chételat, John Jamieson, Heather E. Richardson, Murray Amyot, Marc |
spellingShingle |
Palmer, Michael J. Chételat, John Jamieson, Heather E. Richardson, Murray Amyot, Marc Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake |
author_facet |
Palmer, Michael J. Chételat, John Jamieson, Heather E. Richardson, Murray Amyot, Marc |
author_sort |
Palmer, Michael J. |
title |
Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake |
title_short |
Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake |
title_full |
Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake |
title_fullStr |
Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake |
title_full_unstemmed |
Hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake |
title_sort |
hydrologic control on winter dissolved oxygen mediates arsenic cycling in a small subarctic lake |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/lno.11556 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11556 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11556 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11556 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11556 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
Limnology and Oceanography volume 66, issue S1 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/lno.11556 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
S1 |
_version_ |
1810482208806273024 |