Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply
Abstract Oxygen depletion in lake bottom waters has adverse impacts on ecosystem health including decreased water quality from release of nutrients and reduced substances from sediments, and the reduction of fish growth and reproduction. Depletion occurs when oxygen is consumed during decomposition...
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crwiley:10.1111/gcb.15660 2024-09-15T18:02:18+00:00 Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply Klaus, Marcus Karlsson, Jan Seekell, David Knut och Alice Wallenbergs Stiftelse Svenska Forskningsrådet Formas Vetenskapsrådet 2021 http://dx.doi.org/10.1111/gcb.15660 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15660 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.15660 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ Global Change Biology volume 27, issue 18, page 4238-4253 ISSN 1354-1013 1365-2486 journal-article 2021 crwiley https://doi.org/10.1111/gcb.15660 2024-08-01T04:21:00Z Abstract Oxygen depletion in lake bottom waters has adverse impacts on ecosystem health including decreased water quality from release of nutrients and reduced substances from sediments, and the reduction of fish growth and reproduction. Depletion occurs when oxygen is consumed during decomposition of organic matter, and oxygen replenishment is limited by water column stratification. Arctic–alpine lakes are often well mixed and oxygenated, but rapid climate change in these regions is an important driver of shifts in catchment vegetation that could affect the mixing and oxygen dynamics of lakes. Here, we analyze high‐resolution time series of dissolved oxygen concentration and temperature profiles in 40 Swedish arctic–alpine lakes across the tree line ecotone. The lakes stratified for 1−125 days, and during stratification, near‐bottom dissolved oxygen concentrations changed by −0.20 to +0.15 mg L −1 day −1 , resulting in final concentrations of 1.1−15.5 mg L −1 at the end of the longest stratification period. Structural equation modeling revealed that lakes with taller shoreline vegetation relative to lake area had higher dissolved organic carbon concentrations and oxygen consumption rates, but also lower wind speeds and longer stratification periods, and ultimately, lower near‐bottom dissolved oxygen concentrations. We use an index of shoreline canopy height and lake area to predict variations among our study lakes in near‐bottom dissolved oxygen concentrations at the end of the longest stratification period ( R 2 = 0.41). Upscaling this relationship to 8392 Swedish arctic–alpine lakes revealed that near‐bottom dissolved oxygen concentrations drop below 3, 5, and 7 mg L −1 in 15%, 32%, and 53% of the lakes and that this proportion is sensitive (5%−22%, 13%−45%, and 29%−69%) to hypothetical tree line shifts observed in the past century or reconstructed for the Holocene (±200 m elevation; ±0.5° latitude). Assuming space‐for‐time substitution, we predict that tree line advance will decrease near‐bottom dissolved ... Article in Journal/Newspaper Climate change Wiley Online Library Global Change Biology |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Oxygen depletion in lake bottom waters has adverse impacts on ecosystem health including decreased water quality from release of nutrients and reduced substances from sediments, and the reduction of fish growth and reproduction. Depletion occurs when oxygen is consumed during decomposition of organic matter, and oxygen replenishment is limited by water column stratification. Arctic–alpine lakes are often well mixed and oxygenated, but rapid climate change in these regions is an important driver of shifts in catchment vegetation that could affect the mixing and oxygen dynamics of lakes. Here, we analyze high‐resolution time series of dissolved oxygen concentration and temperature profiles in 40 Swedish arctic–alpine lakes across the tree line ecotone. The lakes stratified for 1−125 days, and during stratification, near‐bottom dissolved oxygen concentrations changed by −0.20 to +0.15 mg L −1 day −1 , resulting in final concentrations of 1.1−15.5 mg L −1 at the end of the longest stratification period. Structural equation modeling revealed that lakes with taller shoreline vegetation relative to lake area had higher dissolved organic carbon concentrations and oxygen consumption rates, but also lower wind speeds and longer stratification periods, and ultimately, lower near‐bottom dissolved oxygen concentrations. We use an index of shoreline canopy height and lake area to predict variations among our study lakes in near‐bottom dissolved oxygen concentrations at the end of the longest stratification period ( R 2 = 0.41). Upscaling this relationship to 8392 Swedish arctic–alpine lakes revealed that near‐bottom dissolved oxygen concentrations drop below 3, 5, and 7 mg L −1 in 15%, 32%, and 53% of the lakes and that this proportion is sensitive (5%−22%, 13%−45%, and 29%−69%) to hypothetical tree line shifts observed in the past century or reconstructed for the Holocene (±200 m elevation; ±0.5° latitude). Assuming space‐for‐time substitution, we predict that tree line advance will decrease near‐bottom dissolved ... |
author2 |
Knut och Alice Wallenbergs Stiftelse Svenska Forskningsrådet Formas Vetenskapsrådet |
format |
Article in Journal/Newspaper |
author |
Klaus, Marcus Karlsson, Jan Seekell, David |
spellingShingle |
Klaus, Marcus Karlsson, Jan Seekell, David Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply |
author_facet |
Klaus, Marcus Karlsson, Jan Seekell, David |
author_sort |
Klaus, Marcus |
title |
Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply |
title_short |
Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply |
title_full |
Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply |
title_fullStr |
Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply |
title_full_unstemmed |
Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply |
title_sort |
tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/gcb.15660 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15660 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.15660 |
genre |
Climate change |
genre_facet |
Climate change |
op_source |
Global Change Biology volume 27, issue 18, page 4238-4253 ISSN 1354-1013 1365-2486 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1111/gcb.15660 |
container_title |
Global Change Biology |
_version_ |
1810439771278802944 |