Assessing the O 2 budget under sea ice: an experimental and modelling approach
<section class="sectionAnchor" id="absSection1"> The objective of this study was to assess the O 2 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-atmosp...
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ftunivtasecite:oai:ecite.utas.edu.au:109562 2023-05-15T18:17:25+02:00 Assessing the O 2 budget under sea ice: an experimental and modelling approach Moreau, S Kaartokallio, H Vancoppenolle, M Zhou, J Kotovich, M Dieckmann, GS Thomas, DN Tison, J-L Delille, B 2015 application/pdf https://doi.org/10.12952/journal.elementa.000080 http://ecite.utas.edu.au/109562 en eng BioOne http://ecite.utas.edu.au/109562/1/Moreau_et_al_2015_O2_dynamics.pdf http://dx.doi.org/10.12952/journal.elementa.000080 Moreau, S and Kaartokallio, H and Vancoppenolle, M and Zhou, J and Kotovich, M and Dieckmann, GS and Thomas, DN and Tison, J-L and Delille, B, Assessing the O 2 budget under sea ice: an experimental and modelling approach, Elementa, 3, (000080) pp. 1-11. ISSN 2325-1026 (2015) [Refereed Article] http://ecite.utas.edu.au/109562 Earth Sciences Oceanography Biological Oceanography Refereed Article PeerReviewed 2015 ftunivtasecite https://doi.org/10.12952/journal.elementa.000080 2019-12-13T22:10:13Z <section class="sectionAnchor" id="absSection1"> The objective of this study was to assess the O 2 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 O 2 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 O 2 concentration was 37% during ice growth and 48% during melt. BGE in the water under sea ice, as retrieved from the simulated O 2 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 O 2 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. </section> Article in Journal/Newspaper Sea ice eCite UTAS (University of Tasmania) Elementa: Science of the Anthropocene 3 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Biological Oceanography |
spellingShingle |
Earth Sciences Oceanography Biological Oceanography Moreau, S Kaartokallio, H Vancoppenolle, M Zhou, J Kotovich, M Dieckmann, GS Thomas, DN Tison, J-L Delille, B Assessing the O 2 budget under sea ice: an experimental and modelling approach |
topic_facet |
Earth Sciences Oceanography Biological Oceanography |
description |
<section class="sectionAnchor" id="absSection1"> The objective of this study was to assess the O 2 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 O 2 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 O 2 concentration was 37% during ice growth and 48% during melt. BGE in the water under sea ice, as retrieved from the simulated O 2 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 O 2 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. </section> |
format |
Article in Journal/Newspaper |
author |
Moreau, S Kaartokallio, H Vancoppenolle, M Zhou, J Kotovich, M Dieckmann, GS Thomas, DN Tison, J-L Delille, B |
author_facet |
Moreau, S Kaartokallio, H Vancoppenolle, M Zhou, J Kotovich, M Dieckmann, GS Thomas, DN Tison, J-L Delille, B |
author_sort |
Moreau, S |
title |
Assessing the O 2 budget under sea ice: an experimental and modelling approach |
title_short |
Assessing the O 2 budget under sea ice: an experimental and modelling approach |
title_full |
Assessing the O 2 budget under sea ice: an experimental and modelling approach |
title_fullStr |
Assessing the O 2 budget under sea ice: an experimental and modelling approach |
title_full_unstemmed |
Assessing the O 2 budget under sea ice: an experimental and modelling approach |
title_sort |
assessing the o 2 budget under sea ice: an experimental and modelling approach |
publisher |
BioOne |
publishDate |
2015 |
url |
https://doi.org/10.12952/journal.elementa.000080 http://ecite.utas.edu.au/109562 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
http://ecite.utas.edu.au/109562/1/Moreau_et_al_2015_O2_dynamics.pdf http://dx.doi.org/10.12952/journal.elementa.000080 Moreau, S and Kaartokallio, H and Vancoppenolle, M and Zhou, J and Kotovich, M and Dieckmann, GS and Thomas, DN and Tison, J-L and Delille, B, Assessing the O 2 budget under sea ice: an experimental and modelling approach, Elementa, 3, (000080) pp. 1-11. ISSN 2325-1026 (2015) [Refereed Article] http://ecite.utas.edu.au/109562 |
op_doi |
https://doi.org/10.12952/journal.elementa.000080 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
3 |
_version_ |
1766191622341525504 |