Oxygen depletion and sediment respiration in ice‐covered arctic lakes
Abstract Processes regulating the rate of oxygen depletion determine whether hypoxia occurs and the extent to which greenhouse gases accumulate in seasonally ice‐covered lakes. Here, we investigate the oxygen budget of four arctic lakes using high‐frequency data during two winters in three shallow l...
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crwiley:10.1002/lno.12357 2024-09-09T19:23:58+00:00 Oxygen depletion and sediment respiration in ice‐covered arctic lakes Schwefel, Robert MacIntyre, Sally Cortés, Alicia Sadro, Steven National Science Foundation Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung 2023 http://dx.doi.org/10.1002/lno.12357 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12357 en eng Wiley http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ Limnology and Oceanography volume 68, issue 7, page 1470-1489 ISSN 0024-3590 1939-5590 journal-article 2023 crwiley https://doi.org/10.1002/lno.12357 2024-08-01T04:19:16Z Abstract Processes regulating the rate of oxygen depletion determine whether hypoxia occurs and the extent to which greenhouse gases accumulate in seasonally ice‐covered lakes. Here, we investigate the oxygen budget of four arctic lakes using high‐frequency data during two winters in three shallow lakes (9–13 m maximal depth) and four winters in 24 m deep main basin of Toolik Lake. Incubation experiments measured sediment metabolism. Volume‐averaged oxygen depletion measured in situ was independent of water temperature and duration of the ice‐covered period. Average rates were between 0.2 and 0.39 g O 2 m −2 d −1 in the shallow lakes and between 0.03 and 0.14 g O 2 m −2 d −1 in Toolik Lake, with higher rates in smaller lakes with their larger sediment area to volume ratio. Rates decreased to ~ 20%–50% of initial values in late winter in the shallow lakes but less or not at all in Toolik. The lack of a decline in Toolik Lake points to continued oxygen transport to the sediment–water interface where oxygen consumption occurs. In all lakes, lower in situ oxygen depletion than in incubation measurements points toward increasing anoxia in the lower water column depressing loss rates. In Toolik, oxygen loss during early winter was less in years with minimal snow cover. Penetrative convection occurred, which could mix downwards oxygen produced by photosynthesis or excluded during ice formation. Estimates of these terms exceeded photosynthesis measured in sediment incubations. Modeling under ice‐oxygen dynamics requires consideration of optical properties and biological and transport processes that modify oxygen concentrations and distributions. Article in Journal/Newspaper Arctic Wiley Online Library Arctic Limnology and Oceanography 68 7 1470 1489 |
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Open Polar |
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Wiley Online Library |
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English |
description |
Abstract Processes regulating the rate of oxygen depletion determine whether hypoxia occurs and the extent to which greenhouse gases accumulate in seasonally ice‐covered lakes. Here, we investigate the oxygen budget of four arctic lakes using high‐frequency data during two winters in three shallow lakes (9–13 m maximal depth) and four winters in 24 m deep main basin of Toolik Lake. Incubation experiments measured sediment metabolism. Volume‐averaged oxygen depletion measured in situ was independent of water temperature and duration of the ice‐covered period. Average rates were between 0.2 and 0.39 g O 2 m −2 d −1 in the shallow lakes and between 0.03 and 0.14 g O 2 m −2 d −1 in Toolik Lake, with higher rates in smaller lakes with their larger sediment area to volume ratio. Rates decreased to ~ 20%–50% of initial values in late winter in the shallow lakes but less or not at all in Toolik. The lack of a decline in Toolik Lake points to continued oxygen transport to the sediment–water interface where oxygen consumption occurs. In all lakes, lower in situ oxygen depletion than in incubation measurements points toward increasing anoxia in the lower water column depressing loss rates. In Toolik, oxygen loss during early winter was less in years with minimal snow cover. Penetrative convection occurred, which could mix downwards oxygen produced by photosynthesis or excluded during ice formation. Estimates of these terms exceeded photosynthesis measured in sediment incubations. Modeling under ice‐oxygen dynamics requires consideration of optical properties and biological and transport processes that modify oxygen concentrations and distributions. |
author2 |
National Science Foundation Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung |
format |
Article in Journal/Newspaper |
author |
Schwefel, Robert MacIntyre, Sally Cortés, Alicia Sadro, Steven |
spellingShingle |
Schwefel, Robert MacIntyre, Sally Cortés, Alicia Sadro, Steven Oxygen depletion and sediment respiration in ice‐covered arctic lakes |
author_facet |
Schwefel, Robert MacIntyre, Sally Cortés, Alicia Sadro, Steven |
author_sort |
Schwefel, Robert |
title |
Oxygen depletion and sediment respiration in ice‐covered arctic lakes |
title_short |
Oxygen depletion and sediment respiration in ice‐covered arctic lakes |
title_full |
Oxygen depletion and sediment respiration in ice‐covered arctic lakes |
title_fullStr |
Oxygen depletion and sediment respiration in ice‐covered arctic lakes |
title_full_unstemmed |
Oxygen depletion and sediment respiration in ice‐covered arctic lakes |
title_sort |
oxygen depletion and sediment respiration in ice‐covered arctic lakes |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1002/lno.12357 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.12357 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Limnology and Oceanography volume 68, issue 7, page 1470-1489 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1002/lno.12357 |
container_title |
Limnology and Oceanography |
container_volume |
68 |
container_issue |
7 |
container_start_page |
1470 |
op_container_end_page |
1489 |
_version_ |
1809893922203238400 |