Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change
Ice cover persists throughout summer over many lakes at extreme polar latitudes but is likely to become increasingly rare with ongoing climate change. Here we addressed the question of how summer ice-cover affects the underlying water column of Ward Hunt Lake, a freshwater lake in the Canadian High...
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ftpubmed:oai:pubmedcentral.nih.gov:7858640 2023-05-15T14:57:47+02:00 Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change Bégin, Paschale N. Tanabe, Yukiko Rautio, Milla Wauthy, Maxime Laurion, Isabelle Uchida, Masaki Culley, Alexander I. Vincent, Warwick F. 2021-02-03 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7858640/ https://doi.org/10.1038/s41598-021-82234-z en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7858640/ http://dx.doi.org/10.1038/s41598-021-82234-z © The Author(s) 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Sci Rep Article Text 2021 ftpubmed https://doi.org/10.1038/s41598-021-82234-z 2021-02-07T01:58:17Z Ice cover persists throughout summer over many lakes at extreme polar latitudes but is likely to become increasingly rare with ongoing climate change. Here we addressed the question of how summer ice-cover affects the underlying water column of Ward Hunt Lake, a freshwater lake in the Canadian High Arctic, with attention to its vertical gradients in limnological properties that would be disrupted by ice loss. Profiling in the deepest part of the lake under thick mid-summer ice revealed a high degree of vertical structure, with gradients in temperature, conductivity and dissolved gases. Dissolved oxygen, nitrous oxide, carbon dioxide and methane rose with depth to concentrations well above air-equilibrium, with oxygen values at > 150% saturation in a mid-water column layer of potential convective mixing. Fatty acid signatures of the seston also varied with depth. Benthic microbial mats were the dominant phototrophs, growing under a dim green light regime controlled by the ice cover, water itself and weakly colored dissolved organic matter that was mostly autochthonous in origin. In this and other polar lakes, future loss of mid-summer ice will completely change many water column properties and benthic light conditions, resulting in a markedly different ecosystem regime. Text Arctic Climate change PubMed Central (PMC) Arctic Scientific Reports 11 1 |
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Article Bégin, Paschale N. Tanabe, Yukiko Rautio, Milla Wauthy, Maxime Laurion, Isabelle Uchida, Masaki Culley, Alexander I. Vincent, Warwick F. Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change |
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Ice cover persists throughout summer over many lakes at extreme polar latitudes but is likely to become increasingly rare with ongoing climate change. Here we addressed the question of how summer ice-cover affects the underlying water column of Ward Hunt Lake, a freshwater lake in the Canadian High Arctic, with attention to its vertical gradients in limnological properties that would be disrupted by ice loss. Profiling in the deepest part of the lake under thick mid-summer ice revealed a high degree of vertical structure, with gradients in temperature, conductivity and dissolved gases. Dissolved oxygen, nitrous oxide, carbon dioxide and methane rose with depth to concentrations well above air-equilibrium, with oxygen values at > 150% saturation in a mid-water column layer of potential convective mixing. Fatty acid signatures of the seston also varied with depth. Benthic microbial mats were the dominant phototrophs, growing under a dim green light regime controlled by the ice cover, water itself and weakly colored dissolved organic matter that was mostly autochthonous in origin. In this and other polar lakes, future loss of mid-summer ice will completely change many water column properties and benthic light conditions, resulting in a markedly different ecosystem regime. |
format |
Text |
author |
Bégin, Paschale N. Tanabe, Yukiko Rautio, Milla Wauthy, Maxime Laurion, Isabelle Uchida, Masaki Culley, Alexander I. Vincent, Warwick F. |
author_facet |
Bégin, Paschale N. Tanabe, Yukiko Rautio, Milla Wauthy, Maxime Laurion, Isabelle Uchida, Masaki Culley, Alexander I. Vincent, Warwick F. |
author_sort |
Bégin, Paschale N. |
title |
Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change |
title_short |
Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change |
title_full |
Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change |
title_fullStr |
Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change |
title_full_unstemmed |
Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change |
title_sort |
water column gradients beneath the summer ice of a high arctic freshwater lake as indicators of sensitivity to climate change |
publisher |
Nature Publishing Group UK |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7858640/ https://doi.org/10.1038/s41598-021-82234-z |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
Sci Rep |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7858640/ http://dx.doi.org/10.1038/s41598-021-82234-z |
op_rights |
© The Author(s) 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
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CC-BY |
op_doi |
https://doi.org/10.1038/s41598-021-82234-z |
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Scientific Reports |
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