Assessing the O2 budget under sea ice: An experimental and modelling approach
Abstract 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...
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ftdoajarticles:oai:doaj.org/article:c6a131c1899b4826918fd9f2f6b2ca8a 2023-05-15T18:17:13+02:00 Assessing the O2 budget under sea ice: An experimental and modelling approach S. Moreau H. Kaartokallio M. Vancoppenolle J. Zhou M. Kotovitch G. S. Dieckmann D.N. Thomas J.-L. Tison B. Delille 2015-12-01T00:00:00Z https://doi.org/10.12952/journal.elementa.000080 https://doaj.org/article/c6a131c1899b4826918fd9f2f6b2ca8a EN eng BioOne http://elementascience.org/article/info:doi/10.12952/journal.elementa.000080 https://doaj.org/toc/2325-1026 2325-1026 doi:10.12952/journal.elementa.000080 https://doaj.org/article/c6a131c1899b4826918fd9f2f6b2ca8a Elementa: Science of the Anthropocene (2015) sea ice bacterial respiration O2 budget Environmental sciences GE1-350 article 2015 ftdoajarticles https://doi.org/10.12952/journal.elementa.000080 2022-12-31T14:03:40Z Abstract 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 Directory of Open Access Journals: DOAJ Articles Elementa: Science of the Anthropocene 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
sea ice bacterial respiration O2 budget Environmental sciences GE1-350 |
spellingShingle |
sea ice bacterial respiration O2 budget Environmental sciences GE1-350 S. Moreau H. Kaartokallio M. Vancoppenolle J. Zhou M. Kotovitch G. S. Dieckmann D.N. Thomas J.-L. Tison B. Delille Assessing the O2 budget under sea ice: An experimental and modelling approach |
topic_facet |
sea ice bacterial respiration O2 budget Environmental sciences GE1-350 |
description |
Abstract 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 |
S. Moreau H. Kaartokallio M. Vancoppenolle J. Zhou M. Kotovitch G. S. Dieckmann D.N. Thomas J.-L. Tison B. Delille |
author_facet |
S. Moreau H. Kaartokallio M. Vancoppenolle J. Zhou M. Kotovitch G. S. Dieckmann D.N. Thomas J.-L. Tison B. Delille |
author_sort |
S. Moreau |
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://doi.org/10.12952/journal.elementa.000080 https://doaj.org/article/c6a131c1899b4826918fd9f2f6b2ca8a |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Elementa: Science of the Anthropocene (2015) |
op_relation |
http://elementascience.org/article/info:doi/10.12952/journal.elementa.000080 https://doaj.org/toc/2325-1026 2325-1026 doi:10.12952/journal.elementa.000080 https://doaj.org/article/c6a131c1899b4826918fd9f2f6b2ca8a |
op_doi |
https://doi.org/10.12952/journal.elementa.000080 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
3 |
_version_ |
1766191305082273792 |