Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change
Abstract 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 Canad...
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ftdoajarticles:oai:doaj.org/article:1cdc9339f609455f92dd16b04908dc8e 2023-05-15T14:57:49+02:00 Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change Paschale N. Bégin Yukiko Tanabe Milla Rautio Maxime Wauthy Isabelle Laurion Masaki Uchida Alexander I. Culley Warwick F. Vincent 2021-02-01T00:00:00Z https://doi.org/10.1038/s41598-021-82234-z https://doaj.org/article/1cdc9339f609455f92dd16b04908dc8e EN eng Nature Portfolio https://doi.org/10.1038/s41598-021-82234-z https://doaj.org/toc/2045-2322 doi:10.1038/s41598-021-82234-z 2045-2322 https://doaj.org/article/1cdc9339f609455f92dd16b04908dc8e Scientific Reports, Vol 11, Iss 1, Pp 1-12 (2021) Medicine R Science Q article 2021 ftdoajarticles https://doi.org/10.1038/s41598-021-82234-z 2022-12-31T05:17:34Z Abstract 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. Article in Journal/Newspaper Arctic Climate change Directory of Open Access Journals: DOAJ Articles Arctic Scientific Reports 11 1 |
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English |
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Medicine R Science Q Paschale N. Bégin Yukiko Tanabe Milla Rautio Maxime Wauthy Isabelle Laurion Masaki Uchida Alexander I. Culley Warwick F. Vincent Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change |
topic_facet |
Medicine R Science Q |
description |
Abstract 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 |
Article in Journal/Newspaper |
author |
Paschale N. Bégin Yukiko Tanabe Milla Rautio Maxime Wauthy Isabelle Laurion Masaki Uchida Alexander I. Culley Warwick F. Vincent |
author_facet |
Paschale N. Bégin Yukiko Tanabe Milla Rautio Maxime Wauthy Isabelle Laurion Masaki Uchida Alexander I. Culley Warwick F. Vincent |
author_sort |
Paschale N. Bégin |
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 Portfolio |
publishDate |
2021 |
url |
https://doi.org/10.1038/s41598-021-82234-z https://doaj.org/article/1cdc9339f609455f92dd16b04908dc8e |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_source |
Scientific Reports, Vol 11, Iss 1, Pp 1-12 (2021) |
op_relation |
https://doi.org/10.1038/s41598-021-82234-z https://doaj.org/toc/2045-2322 doi:10.1038/s41598-021-82234-z 2045-2322 https://doaj.org/article/1cdc9339f609455f92dd16b04908dc8e |
op_doi |
https://doi.org/10.1038/s41598-021-82234-z |
container_title |
Scientific Reports |
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11 |
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1 |
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1766329934413824000 |