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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Autores principales:	Paschale N. Bégin, Yukiko Tanabe, Milla Rautio, Maxime Wauthy, Isabelle Laurion, Masaki Uchida, Alexander I. Culley, Warwick F. Vincent
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1cdc9339f609455f92dd16b04908dc8e
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spelling	oai:doaj.org-article:1cdc9339f609455f92dd16b04908dc8e2021-12-02T10:44:15ZWater column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change10.1038/s41598-021-82234-z2045-2322https://doaj.org/article/1cdc9339f609455f92dd16b04908dc8e2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82234-zhttps://doaj.org/toc/2045-2322Abstract 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.Paschale N. BéginYukiko TanabeMilla RautioMaxime WauthyIsabelle LaurionMasaki UchidaAlexander I. CulleyWarwick F. VincentNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	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
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
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://doaj.org/article/1cdc9339f609455f92dd16b04908dc8e
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Water column gradients beneath the summer ice of a High Arctic freshwater lake as indicators of sensitivity to climate change

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