Assessing benthic oxygen fluxes in oligotrophic deep sea sediments (HAUSGARTEN observatory)
Benthic oxygen fluxes, an established proxy for total organic carbon mineralization, were investigated in oligotrophic deep sea sediments. We used three different in situ technologies to estimate the benthic oxygen fluxes at an Arctic deep sea site (2500 m depth, HAUSGARTEN observatory) with limitin...
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ftunivgeneve:oai:unige.ch:unige:80716 2023-05-15T15:08:47+02:00 Assessing benthic oxygen fluxes in oligotrophic deep sea sediments (HAUSGARTEN observatory) Donis, Daphné McGinnis, Daniel Frank Holtappels, Moritz Felden, Janine Wenzhoefer, Frank 2016 https://archive-ouverte.unige.ch/unige:80716 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2015.11.007 unige:80716 https://archive-ouverte.unige.ch/unige:80716 info:eu-repo/semantics/restrictedAccess ISSN: 0967-0637 Deep-sea research. Part 1. Oceanographic research papers, Vol. 111 (2016) pp. 1-10 info:eu-repo/classification/ddc/550 Benthic oxygen uptake Aquatic eddy covariance In situ oxygen microelectrodes Benthic chambers Deep-sea sediments HAUSGARTEN observatory Text Article scientifique info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftunivgeneve https://doi.org/10.1016/j.dsr.2015.11.007 2022-06-19T23:40:09Z Benthic oxygen fluxes, an established proxy for total organic carbon mineralization, were investigated in oligotrophic deep sea sediments. We used three different in situ technologies to estimate the benthic oxygen fluxes at an Arctic deep sea site (2500 m depth, HAUSGARTEN observatory) with limiting conditions of low oxygen gradients and fluxes, low turbulence and low particle content in the benthic boundary layer. The resolved eddy covariance turbulent oxygen flux (−0.9±0.2 (SD) mmol O2 m−2 d−1) compared well with simultaneous dissolved oxygen flux measurements carried out with a microprofiler (−1.02±0.3 (SD) mmol O2 m−2 d−1) and total oxygen uptake obtained by benthic chamber incubations (−1.1±0.1 (SD) mmol O2 m−2 d−1). The agreement between these different techniques revealed that microbial-mediated oxygen consumption was dominant at this site. The average benthic flux equals a carbon mineralization rate of 4.3 g C m−2 yr−1, which exceeds the annual sedimentation of particulate organic matter measured by sediment traps. The present study represents a detailed comparison of different in situ technologies for benthic flux measurements at different spatial scales in oligotrophic deep sea sediments. The use of eddy covariance, so far rarely used for deep sea investigations, is presented in detail. Article in Journal/Newspaper Arctic Université de Genève: Archive ouverte UNIGE Arctic Deep Sea Research Part I: Oceanographic Research Papers 111 1 10 |
institution |
Open Polar |
collection |
Université de Genève: Archive ouverte UNIGE |
op_collection_id |
ftunivgeneve |
language |
English |
topic |
info:eu-repo/classification/ddc/550 Benthic oxygen uptake Aquatic eddy covariance In situ oxygen microelectrodes Benthic chambers Deep-sea sediments HAUSGARTEN observatory |
spellingShingle |
info:eu-repo/classification/ddc/550 Benthic oxygen uptake Aquatic eddy covariance In situ oxygen microelectrodes Benthic chambers Deep-sea sediments HAUSGARTEN observatory Donis, Daphné McGinnis, Daniel Frank Holtappels, Moritz Felden, Janine Wenzhoefer, Frank Assessing benthic oxygen fluxes in oligotrophic deep sea sediments (HAUSGARTEN observatory) |
topic_facet |
info:eu-repo/classification/ddc/550 Benthic oxygen uptake Aquatic eddy covariance In situ oxygen microelectrodes Benthic chambers Deep-sea sediments HAUSGARTEN observatory |
description |
Benthic oxygen fluxes, an established proxy for total organic carbon mineralization, were investigated in oligotrophic deep sea sediments. We used three different in situ technologies to estimate the benthic oxygen fluxes at an Arctic deep sea site (2500 m depth, HAUSGARTEN observatory) with limiting conditions of low oxygen gradients and fluxes, low turbulence and low particle content in the benthic boundary layer. The resolved eddy covariance turbulent oxygen flux (−0.9±0.2 (SD) mmol O2 m−2 d−1) compared well with simultaneous dissolved oxygen flux measurements carried out with a microprofiler (−1.02±0.3 (SD) mmol O2 m−2 d−1) and total oxygen uptake obtained by benthic chamber incubations (−1.1±0.1 (SD) mmol O2 m−2 d−1). The agreement between these different techniques revealed that microbial-mediated oxygen consumption was dominant at this site. The average benthic flux equals a carbon mineralization rate of 4.3 g C m−2 yr−1, which exceeds the annual sedimentation of particulate organic matter measured by sediment traps. The present study represents a detailed comparison of different in situ technologies for benthic flux measurements at different spatial scales in oligotrophic deep sea sediments. The use of eddy covariance, so far rarely used for deep sea investigations, is presented in detail. |
format |
Article in Journal/Newspaper |
author |
Donis, Daphné McGinnis, Daniel Frank Holtappels, Moritz Felden, Janine Wenzhoefer, Frank |
author_facet |
Donis, Daphné McGinnis, Daniel Frank Holtappels, Moritz Felden, Janine Wenzhoefer, Frank |
author_sort |
Donis, Daphné |
title |
Assessing benthic oxygen fluxes in oligotrophic deep sea sediments (HAUSGARTEN observatory) |
title_short |
Assessing benthic oxygen fluxes in oligotrophic deep sea sediments (HAUSGARTEN observatory) |
title_full |
Assessing benthic oxygen fluxes in oligotrophic deep sea sediments (HAUSGARTEN observatory) |
title_fullStr |
Assessing benthic oxygen fluxes in oligotrophic deep sea sediments (HAUSGARTEN observatory) |
title_full_unstemmed |
Assessing benthic oxygen fluxes in oligotrophic deep sea sediments (HAUSGARTEN observatory) |
title_sort |
assessing benthic oxygen fluxes in oligotrophic deep sea sediments (hausgarten observatory) |
publishDate |
2016 |
url |
https://archive-ouverte.unige.ch/unige:80716 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 0967-0637 Deep-sea research. Part 1. Oceanographic research papers, Vol. 111 (2016) pp. 1-10 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2015.11.007 unige:80716 https://archive-ouverte.unige.ch/unige:80716 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2015.11.007 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
111 |
container_start_page |
1 |
op_container_end_page |
10 |
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1766340076513525760 |