Oxygen depletion in subarctic peatland thaw lakes
Permafrost thawing and erosion results in the enrichment of northern lakes by soil organic matter. These allochthonous inputs favour bacterial decomposition and may cause the draw-down of dissolved oxygen to anoxic conditions that promote methanogenesis. Our objective in the present study was to det...
Published in: | Arctic Science |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English French |
Published: |
Canadian Science Publishing
2017
|
Subjects: | |
Online Access: | https://doi.org/10.1139/as-2016-0048 https://doaj.org/article/bea98fc683664b4d8fa758d24f5f81c0 |
id |
ftdoajarticles:oai:doaj.org/article:bea98fc683664b4d8fa758d24f5f81c0 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:bea98fc683664b4d8fa758d24f5f81c0 2023-05-15T14:23:36+02:00 Oxygen depletion in subarctic peatland thaw lakes Bethany N. Deshpande Frédéric Maps Alex Matveev Warwick F. Vincent 2017-06-01T00:00:00Z https://doi.org/10.1139/as-2016-0048 https://doaj.org/article/bea98fc683664b4d8fa758d24f5f81c0 EN FR eng fre Canadian Science Publishing https://doi.org/10.1139/as-2016-0048 https://doaj.org/toc/2368-7460 doi:10.1139/as-2016-0048 2368-7460 https://doaj.org/article/bea98fc683664b4d8fa758d24f5f81c0 Arctic Science, Vol 3, Iss 2, Pp 406-428 (2017) oxygen permafrost respiration thaw lakes thermokarst Environmental sciences GE1-350 Environmental engineering TA170-171 article 2017 ftdoajarticles https://doi.org/10.1139/as-2016-0048 2022-12-31T09:56:01Z Permafrost thawing and erosion results in the enrichment of northern lakes by soil organic matter. These allochthonous inputs favour bacterial decomposition and may cause the draw-down of dissolved oxygen to anoxic conditions that promote methanogenesis. Our objective in the present study was to determine the seasonal variations in dissolved oxygen in a set of permafrost peatland lakes in subarctic Quebec, Canada, and to relate these changes to metabolic rates, ice cover, and mixing. The lakes had high dissolved organic carbon concentrations, and their surface waters in summer had greenhouse gas concentrations that were up to one (CO2) to three (CH4) orders of magnitude above air-equilibrium values, indicating their strongly heterotrophic character. Consistent with these observations, the peatland lakes had elevated rates of bacterial production and oxygen consumption. Continuous measurements of oxygen by in situ sensors and of ice cover by automated field cameras showed that the lakes became fully anoxic shortly after freeze-up. The waters were partially re-oxygenated by mixing events in spring and fall, but in one lake, the bottom waters remained anoxic throughout the year. These observations provide a foundation for subsequent biogeochemical and modelling studies of peatland thaw lakes as an abundant class of Arctic freshwater ecosystems Article in Journal/Newspaper Arctic Arctic Ice permafrost Subarctic Thermokarst Directory of Open Access Journals: DOAJ Articles Arctic Canada Arctic Science 3 2 406 428 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English French |
topic |
oxygen permafrost respiration thaw lakes thermokarst Environmental sciences GE1-350 Environmental engineering TA170-171 |
spellingShingle |
oxygen permafrost respiration thaw lakes thermokarst Environmental sciences GE1-350 Environmental engineering TA170-171 Bethany N. Deshpande Frédéric Maps Alex Matveev Warwick F. Vincent Oxygen depletion in subarctic peatland thaw lakes |
topic_facet |
oxygen permafrost respiration thaw lakes thermokarst Environmental sciences GE1-350 Environmental engineering TA170-171 |
description |
Permafrost thawing and erosion results in the enrichment of northern lakes by soil organic matter. These allochthonous inputs favour bacterial decomposition and may cause the draw-down of dissolved oxygen to anoxic conditions that promote methanogenesis. Our objective in the present study was to determine the seasonal variations in dissolved oxygen in a set of permafrost peatland lakes in subarctic Quebec, Canada, and to relate these changes to metabolic rates, ice cover, and mixing. The lakes had high dissolved organic carbon concentrations, and their surface waters in summer had greenhouse gas concentrations that were up to one (CO2) to three (CH4) orders of magnitude above air-equilibrium values, indicating their strongly heterotrophic character. Consistent with these observations, the peatland lakes had elevated rates of bacterial production and oxygen consumption. Continuous measurements of oxygen by in situ sensors and of ice cover by automated field cameras showed that the lakes became fully anoxic shortly after freeze-up. The waters were partially re-oxygenated by mixing events in spring and fall, but in one lake, the bottom waters remained anoxic throughout the year. These observations provide a foundation for subsequent biogeochemical and modelling studies of peatland thaw lakes as an abundant class of Arctic freshwater ecosystems |
format |
Article in Journal/Newspaper |
author |
Bethany N. Deshpande Frédéric Maps Alex Matveev Warwick F. Vincent |
author_facet |
Bethany N. Deshpande Frédéric Maps Alex Matveev Warwick F. Vincent |
author_sort |
Bethany N. Deshpande |
title |
Oxygen depletion in subarctic peatland thaw lakes |
title_short |
Oxygen depletion in subarctic peatland thaw lakes |
title_full |
Oxygen depletion in subarctic peatland thaw lakes |
title_fullStr |
Oxygen depletion in subarctic peatland thaw lakes |
title_full_unstemmed |
Oxygen depletion in subarctic peatland thaw lakes |
title_sort |
oxygen depletion in subarctic peatland thaw lakes |
publisher |
Canadian Science Publishing |
publishDate |
2017 |
url |
https://doi.org/10.1139/as-2016-0048 https://doaj.org/article/bea98fc683664b4d8fa758d24f5f81c0 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Arctic Ice permafrost Subarctic Thermokarst |
genre_facet |
Arctic Arctic Ice permafrost Subarctic Thermokarst |
op_source |
Arctic Science, Vol 3, Iss 2, Pp 406-428 (2017) |
op_relation |
https://doi.org/10.1139/as-2016-0048 https://doaj.org/toc/2368-7460 doi:10.1139/as-2016-0048 2368-7460 https://doaj.org/article/bea98fc683664b4d8fa758d24f5f81c0 |
op_doi |
https://doi.org/10.1139/as-2016-0048 |
container_title |
Arctic Science |
container_volume |
3 |
container_issue |
2 |
container_start_page |
406 |
op_container_end_page |
428 |
_version_ |
1766296112054927360 |