Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply
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 organi...
Published in: | Global Change Biology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
2021
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-186220 https://doi.org/10.1111/gcb.15660 |
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ftumeauniv:oai:DiVA.org:umu-186220 2023-10-09T21:48:38+02:00 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 A. 2021 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-186220 https://doi.org/10.1111/gcb.15660 eng eng Umeå universitet, Institutionen för ekologi, miljö och geovetenskap Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden Global Change Biology, 1354-1013, 2021, 27:18, s. 4238-4253 orcid:0000-0003-0747-3524 orcid:0000-0001-5730-0694 orcid:0000-0001-6700-6149 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-186220 doi:10.1111/gcb.15660 PMID 33960592 ISI:000651544700001 Scopus 2-s2.0-85105926012 info:eu-repo/semantics/openAccess dissolved organic carbon environmental change forest–tundra ecotone hypoxia lake ecosystem lake stratification thermal structure wind speed Ecology Ekologi Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Article in journal info:eu-repo/semantics/article text 2021 ftumeauniv https://doi.org/10.1111/gcb.15660 2023-09-22T13:54:57Z 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 (R2 = 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 oxygen ... Article in Journal/Newspaper Arctic Climate change Tundra Umeå University: Publications (DiVA) Arctic Global Change Biology |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
dissolved organic carbon environmental change forest–tundra ecotone hypoxia lake ecosystem lake stratification thermal structure wind speed Ecology Ekologi Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser |
spellingShingle |
dissolved organic carbon environmental change forest–tundra ecotone hypoxia lake ecosystem lake stratification thermal structure wind speed Ecology Ekologi Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Klaus, Marcus Karlsson, Jan Seekell, David A. Tree line advance reduces mixing and oxygen concentrations in arctic–alpine lakes through wind sheltering and organic carbon supply |
topic_facet |
dissolved organic carbon environmental change forest–tundra ecotone hypoxia lake ecosystem lake stratification thermal structure wind speed Ecology Ekologi Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser |
description |
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 (R2 = 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 oxygen ... |
format |
Article in Journal/Newspaper |
author |
Klaus, Marcus Karlsson, Jan Seekell, David A. |
author_facet |
Klaus, Marcus Karlsson, Jan Seekell, David A. |
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 |
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2021 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-186220 https://doi.org/10.1111/gcb.15660 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Tundra |
genre_facet |
Arctic Climate change Tundra |
op_relation |
Global Change Biology, 1354-1013, 2021, 27:18, s. 4238-4253 orcid:0000-0003-0747-3524 orcid:0000-0001-5730-0694 orcid:0000-0001-6700-6149 http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-186220 doi:10.1111/gcb.15660 PMID 33960592 ISI:000651544700001 Scopus 2-s2.0-85105926012 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1111/gcb.15660 |
container_title |
Global Change Biology |
_version_ |
1779311715798745088 |