Oxygen depletion and sediment respiration in ice‐covered arctic lakes
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 (9–1...
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2023
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ftcdlib:oai:escholarship.org:ark:/13030/qt8cf8x2wx 2023-09-05T13:17:17+02:00 Oxygen depletion and sediment respiration in ice‐covered arctic lakes Schwefel, Robert MacIntyre, Sally Cortés, Alicia Sadro, Steven 1470 - 1489 2023-07-01 application/pdf https://escholarship.org/uc/item/8cf8x2wx unknown eScholarship, University of California qt8cf8x2wx https://escholarship.org/uc/item/8cf8x2wx CC-BY-ND Limnology and Oceanography, vol 68, iss 7 Earth Sciences Environmental Sciences Biological Sciences Marine Biology & Hydrobiology article 2023 ftcdlib 2023-08-14T18:05:21Z 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 O2 m−2 d−1 in the shallow lakes and between 0.03 and 0.14 g O2 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 University of California: eScholarship Arctic |
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Open Polar |
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University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
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topic |
Earth Sciences Environmental Sciences Biological Sciences Marine Biology & Hydrobiology |
spellingShingle |
Earth Sciences Environmental Sciences Biological Sciences Marine Biology & Hydrobiology Schwefel, Robert MacIntyre, Sally Cortés, Alicia Sadro, Steven Oxygen depletion and sediment respiration in ice‐covered arctic lakes |
topic_facet |
Earth Sciences Environmental Sciences Biological Sciences Marine Biology & Hydrobiology |
description |
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 O2 m−2 d−1 in the shallow lakes and between 0.03 and 0.14 g O2 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. |
format |
Article in Journal/Newspaper |
author |
Schwefel, Robert MacIntyre, Sally Cortés, Alicia Sadro, Steven |
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 |
eScholarship, University of California |
publishDate |
2023 |
url |
https://escholarship.org/uc/item/8cf8x2wx |
op_coverage |
1470 - 1489 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Limnology and Oceanography, vol 68, iss 7 |
op_relation |
qt8cf8x2wx https://escholarship.org/uc/item/8cf8x2wx |
op_rights |
CC-BY-ND |
_version_ |
1776198518236512256 |