Assessing the O2 budget under sea ice: An experimental and modelling approach
peer reviewed The objective of this study was to assess the O2 budget in the water under sea ice combining observations and modelling. Modelling was used to discriminate between physical processes, gas-specific transport (i.e., ice-atmosphere gas fluxes and gas bubble buoyancy) and bacterial respira...
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Online Access: | https://orbi.uliege.be/handle/2268/188938 https://orbi.uliege.be/bitstream/2268/188938/1/Moreau_et_al_2015_O2_dynamics.pdf https://doi.org/10.12952/journal.elementa.000080 |
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ftorbi:oai:orbi.ulg.ac.be:2268/188938 2024-10-13T14:10:42+00:00 Assessing the O2 budget under sea ice: An experimental and modelling approach Moreau, S. Kaartokallio, H. Vancoppenolle, M. Zhou, Jiayun Kotovitch, Marie Dieckmann, G.S. Thomas, D.N. Tison, Jean-Louis Delille, Bruno 2015-12-03 https://orbi.uliege.be/handle/2268/188938 https://orbi.uliege.be/bitstream/2268/188938/1/Moreau_et_al_2015_O2_dynamics.pdf https://doi.org/10.12952/journal.elementa.000080 en eng BioOne urn:issn:2325-1026 https://orbi.uliege.be/handle/2268/188938 info:hdl:2268/188938 https://orbi.uliege.be/bitstream/2268/188938/1/Moreau_et_al_2015_O2_dynamics.pdf doi:10.12952/journal.elementa.000080 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Elementa: Science of the Anthropocene, 3 (000080) (2015-12-03) Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2015 ftorbi https://doi.org/10.12952/journal.elementa.000080 2024-09-27T07:01:54Z peer reviewed The objective of this study was to assess the O2 budget in the water under sea ice combining observations and modelling. Modelling was used to discriminate between physical processes, gas-specific transport (i.e., ice-atmosphere gas fluxes and gas bubble buoyancy) and bacterial respiration (BR) and to constrain bacterial growth efficiency (BGE). A module describing the changes of the under-ice water properties, due to brine rejection and temperature-dependent BR, was implemented in the one-dimensional halo-thermodynamic sea ice model LIM1D. Our results show that BR was the dominant biogeochemical driver of O2 concentration in the water under ice (in a system without primary producers), followed by gas specific transport. The model suggests that the actual contribution of BR and gas specific transport to the change in seawater O2 concentration was 37% during ice growth and 48% during melt. BGE in the water under sea ice, as retrieved from the simulated O2 budget, was found to be between 0.4 and 0.5, which is in line with published BGE values for cold marine waters. Given the importance of BR to seawater O2 in the present study, it can be assumed that bacteria contribute substantially to organic matter consumption and gas fluxes in ice-covered polar oceans. In addition, we propose a parameterization of polar marine bacterial respiration, based on the strong temperature dependence of bacterial respiration and the high growth efficiency observed here, for further biogeochemical ocean modelling applications, such as regional or large-scale Earth System models Article in Journal/Newspaper Sea ice University of Liège: ORBi (Open Repository and Bibliography) Elementa: Science of the Anthropocene 3 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Moreau, S. Kaartokallio, H. Vancoppenolle, M. Zhou, Jiayun Kotovitch, Marie Dieckmann, G.S. Thomas, D.N. Tison, Jean-Louis Delille, Bruno Assessing the O2 budget under sea ice: An experimental and modelling approach |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed The objective of this study was to assess the O2 budget in the water under sea ice combining observations and modelling. Modelling was used to discriminate between physical processes, gas-specific transport (i.e., ice-atmosphere gas fluxes and gas bubble buoyancy) and bacterial respiration (BR) and to constrain bacterial growth efficiency (BGE). A module describing the changes of the under-ice water properties, due to brine rejection and temperature-dependent BR, was implemented in the one-dimensional halo-thermodynamic sea ice model LIM1D. Our results show that BR was the dominant biogeochemical driver of O2 concentration in the water under ice (in a system without primary producers), followed by gas specific transport. The model suggests that the actual contribution of BR and gas specific transport to the change in seawater O2 concentration was 37% during ice growth and 48% during melt. BGE in the water under sea ice, as retrieved from the simulated O2 budget, was found to be between 0.4 and 0.5, which is in line with published BGE values for cold marine waters. Given the importance of BR to seawater O2 in the present study, it can be assumed that bacteria contribute substantially to organic matter consumption and gas fluxes in ice-covered polar oceans. In addition, we propose a parameterization of polar marine bacterial respiration, based on the strong temperature dependence of bacterial respiration and the high growth efficiency observed here, for further biogeochemical ocean modelling applications, such as regional or large-scale Earth System models |
format |
Article in Journal/Newspaper |
author |
Moreau, S. Kaartokallio, H. Vancoppenolle, M. Zhou, Jiayun Kotovitch, Marie Dieckmann, G.S. Thomas, D.N. Tison, Jean-Louis Delille, Bruno |
author_facet |
Moreau, S. Kaartokallio, H. Vancoppenolle, M. Zhou, Jiayun Kotovitch, Marie Dieckmann, G.S. Thomas, D.N. Tison, Jean-Louis Delille, Bruno |
author_sort |
Moreau, S. |
title |
Assessing the O2 budget under sea ice: An experimental and modelling approach |
title_short |
Assessing the O2 budget under sea ice: An experimental and modelling approach |
title_full |
Assessing the O2 budget under sea ice: An experimental and modelling approach |
title_fullStr |
Assessing the O2 budget under sea ice: An experimental and modelling approach |
title_full_unstemmed |
Assessing the O2 budget under sea ice: An experimental and modelling approach |
title_sort |
assessing the o2 budget under sea ice: an experimental and modelling approach |
publisher |
BioOne |
publishDate |
2015 |
url |
https://orbi.uliege.be/handle/2268/188938 https://orbi.uliege.be/bitstream/2268/188938/1/Moreau_et_al_2015_O2_dynamics.pdf https://doi.org/10.12952/journal.elementa.000080 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Elementa: Science of the Anthropocene, 3 (000080) (2015-12-03) |
op_relation |
urn:issn:2325-1026 https://orbi.uliege.be/handle/2268/188938 info:hdl:2268/188938 https://orbi.uliege.be/bitstream/2268/188938/1/Moreau_et_al_2015_O2_dynamics.pdf doi:10.12952/journal.elementa.000080 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.12952/journal.elementa.000080 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
3 |
_version_ |
1812818116371021824 |