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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2021
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Online Access: | https://hdl.handle.net/20.500.11794/67820 https://doi.org/10.1038/s41598-021-82234-z |
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ftunivlavalcorp:oai:corpus.ulaval.ca:20.500.11794/67820 2024-06-23T07:50:09+00:00 Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change Culley, Alexander Bégin, Paschale Noël Vincent, Warwick F. Régions froides 2021-01-19T00:37:04Z application/pdf https://hdl.handle.net/20.500.11794/67820 https://doi.org/10.1038/s41598-021-82234-z eng eng Nature Publishing Group 2045-2322 http://hdl.handle.net/20.500.11794/67820 doi:10.1038/s41598-021-82234-z http://purl.org/coar/access_right/c_abf2 CDOM Climate change Lake ice Methane Oxygen Microbial mats Phytoplankton 50 pigments Optics Uderwater light Lacs Réchauffement de la Terre Dégel article de recherche COAR1_1::Texte::Périodique::Revue::Contribution à un journal::Article::Article de recherche 2021 ftunivlavalcorp https://doi.org/20.500.11794/6782010.1038/s41598-021-82234-z 2024-06-10T23:42:53Z 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. Other/Unknown Material Arctic Climate change Phytoplankton Université Laval: CorpusUL Arctic Scientific Reports 11 1 |
institution |
Open Polar |
collection |
Université Laval: CorpusUL |
op_collection_id |
ftunivlavalcorp |
language |
English |
topic |
CDOM Climate change Lake ice Methane Oxygen Microbial mats Phytoplankton 50 pigments Optics Uderwater light Lacs Réchauffement de la Terre Dégel |
spellingShingle |
CDOM Climate change Lake ice Methane Oxygen Microbial mats Phytoplankton 50 pigments Optics Uderwater light Lacs Réchauffement de la Terre Dégel Culley, Alexander Bégin, Paschale Noël Vincent, Warwick F. Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change |
topic_facet |
CDOM Climate change Lake ice Methane Oxygen Microbial mats Phytoplankton 50 pigments Optics Uderwater light Lacs Réchauffement de la Terre Dégel |
description |
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 |
Other/Unknown Material |
author |
Culley, Alexander Bégin, Paschale Noël Vincent, Warwick F. |
author_facet |
Culley, Alexander Bégin, Paschale Noël Vincent, Warwick F. |
author_sort |
Culley, Alexander |
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 |
publishDate |
2021 |
url |
https://hdl.handle.net/20.500.11794/67820 https://doi.org/10.1038/s41598-021-82234-z |
op_coverage |
Régions froides |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Phytoplankton |
genre_facet |
Arctic Climate change Phytoplankton |
op_relation |
2045-2322 http://hdl.handle.net/20.500.11794/67820 doi:10.1038/s41598-021-82234-z |
op_rights |
http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/20.500.11794/6782010.1038/s41598-021-82234-z |
container_title |
Scientific Reports |
container_volume |
11 |
container_issue |
1 |
_version_ |
1802641024740229120 |