Water column distribution and carbon isotopic signal of cholesterol, brassicasterol and particulate organic carbon in the Atlantic sector of the Southern Ocean
The combination of concentrations and delta C-13 signatures of Particulate Organic Carbon (POC) and sterols provides a powerful approach to study ecological and environmental changes in both the modern and ancient ocean. We applied this tool to study the biogeochemical changes in the modern ocean wa...
Published in: | Biogeosciences |
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Copernicus Gesellschaft Mbh
2013
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Online Access: | https://archimer.ifremer.fr/doc/00265/37576/36778.pdf https://archimer.ifremer.fr/doc/00265/37576/93164.zip https://archimer.ifremer.fr/doc/00265/37576/93165.pdf https://doi.org/10.5194/bg-10-2787-2013 https://archimer.ifremer.fr/doc/00265/37576/ |
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ftarchimer:oai:archimer.ifremer.fr:37576 2023-05-15T16:36:34+02:00 Water column distribution and carbon isotopic signal of cholesterol, brassicasterol and particulate organic carbon in the Atlantic sector of the Southern Ocean Cavagna, A. -j. Dehairs, F. Bouillon, S. Woule-ebongue, V. Planchon, F. Delille, B. Bouloubassi, I. 2013 application/pdf https://archimer.ifremer.fr/doc/00265/37576/36778.pdf https://archimer.ifremer.fr/doc/00265/37576/93164.zip https://archimer.ifremer.fr/doc/00265/37576/93165.pdf https://doi.org/10.5194/bg-10-2787-2013 https://archimer.ifremer.fr/doc/00265/37576/ eng eng Copernicus Gesellschaft Mbh https://archimer.ifremer.fr/doc/00265/37576/36778.pdf https://archimer.ifremer.fr/doc/00265/37576/93164.zip https://archimer.ifremer.fr/doc/00265/37576/93165.pdf doi:10.5194/bg-10-2787-2013 https://archimer.ifremer.fr/doc/00265/37576/ Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use CC-BY Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2013 , Vol. 10 , N. 4 , P. 2787-2801 text Publication info:eu-repo/semantics/article 2013 ftarchimer https://doi.org/10.5194/bg-10-2787-2013 2022-04-12T22:50:01Z The combination of concentrations and delta C-13 signatures of Particulate Organic Carbon (POC) and sterols provides a powerful approach to study ecological and environmental changes in both the modern and ancient ocean. We applied this tool to study the biogeochemical changes in the modern ocean water column during the BONUS-GoodHope survey (February-March 2008) from Cape Basin to the northern part of the Weddell Gyre. Cholesterol and brassicasterol were chosen as ideal biomarkers of the heterotrophic and autotrophic carbon pools, respectively, because of their ubiquitous and relatively refractory nature. We document depth distributions of concentrations (relative to bulk POC) and delta C-13 signatures of cholesterol and brassicasterol combined with CO2 aq. surface concentration variation. While the relationship between CO2 aq. and delta C-13 of bulk POC and biomarkers have been reported by others for the surface water, our data show that this persists in mesopelagic and deep waters, suggesting that delta C-13 signatures of certain biomarkers in the water column could be applied as proxies for surface water CO2 aq. We observed a general increase in sterol delta C-13 signatures with depth, which is likely related to a combination of particle size effects, selective feeding on larger cells by zooplankton, and growth rate related effects. Our data suggest a key role of zooplankton fecal aggregates in carbon export for this part of the Southern Ocean (SO). Additionally, in the southern part of the transect south of the Polar Front (PF), the release of sea-ice algae during the ice demise in the Seasonal Ice Zone (SIZ) is hypothesized to influence the isotopic signature of sterols in the open ocean. Overall, the combined use of delta C-13 values and concentrations measurements of both bulk organic C and specific sterols throughout the water column offers the promising potential to explore the recent history of plankton and the fate of organic matter in the SO. Article in Journal/Newspaper ice algae Sea ice Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Southern Ocean Weddell Biogeosciences 10 4 2787 2801 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The combination of concentrations and delta C-13 signatures of Particulate Organic Carbon (POC) and sterols provides a powerful approach to study ecological and environmental changes in both the modern and ancient ocean. We applied this tool to study the biogeochemical changes in the modern ocean water column during the BONUS-GoodHope survey (February-March 2008) from Cape Basin to the northern part of the Weddell Gyre. Cholesterol and brassicasterol were chosen as ideal biomarkers of the heterotrophic and autotrophic carbon pools, respectively, because of their ubiquitous and relatively refractory nature. We document depth distributions of concentrations (relative to bulk POC) and delta C-13 signatures of cholesterol and brassicasterol combined with CO2 aq. surface concentration variation. While the relationship between CO2 aq. and delta C-13 of bulk POC and biomarkers have been reported by others for the surface water, our data show that this persists in mesopelagic and deep waters, suggesting that delta C-13 signatures of certain biomarkers in the water column could be applied as proxies for surface water CO2 aq. We observed a general increase in sterol delta C-13 signatures with depth, which is likely related to a combination of particle size effects, selective feeding on larger cells by zooplankton, and growth rate related effects. Our data suggest a key role of zooplankton fecal aggregates in carbon export for this part of the Southern Ocean (SO). Additionally, in the southern part of the transect south of the Polar Front (PF), the release of sea-ice algae during the ice demise in the Seasonal Ice Zone (SIZ) is hypothesized to influence the isotopic signature of sterols in the open ocean. Overall, the combined use of delta C-13 values and concentrations measurements of both bulk organic C and specific sterols throughout the water column offers the promising potential to explore the recent history of plankton and the fate of organic matter in the SO. |
format |
Article in Journal/Newspaper |
author |
Cavagna, A. -j. Dehairs, F. Bouillon, S. Woule-ebongue, V. Planchon, F. Delille, B. Bouloubassi, I. |
spellingShingle |
Cavagna, A. -j. Dehairs, F. Bouillon, S. Woule-ebongue, V. Planchon, F. Delille, B. Bouloubassi, I. Water column distribution and carbon isotopic signal of cholesterol, brassicasterol and particulate organic carbon in the Atlantic sector of the Southern Ocean |
author_facet |
Cavagna, A. -j. Dehairs, F. Bouillon, S. Woule-ebongue, V. Planchon, F. Delille, B. Bouloubassi, I. |
author_sort |
Cavagna, A. -j. |
title |
Water column distribution and carbon isotopic signal of cholesterol, brassicasterol and particulate organic carbon in the Atlantic sector of the Southern Ocean |
title_short |
Water column distribution and carbon isotopic signal of cholesterol, brassicasterol and particulate organic carbon in the Atlantic sector of the Southern Ocean |
title_full |
Water column distribution and carbon isotopic signal of cholesterol, brassicasterol and particulate organic carbon in the Atlantic sector of the Southern Ocean |
title_fullStr |
Water column distribution and carbon isotopic signal of cholesterol, brassicasterol and particulate organic carbon in the Atlantic sector of the Southern Ocean |
title_full_unstemmed |
Water column distribution and carbon isotopic signal of cholesterol, brassicasterol and particulate organic carbon in the Atlantic sector of the Southern Ocean |
title_sort |
water column distribution and carbon isotopic signal of cholesterol, brassicasterol and particulate organic carbon in the atlantic sector of the southern ocean |
publisher |
Copernicus Gesellschaft Mbh |
publishDate |
2013 |
url |
https://archimer.ifremer.fr/doc/00265/37576/36778.pdf https://archimer.ifremer.fr/doc/00265/37576/93164.zip https://archimer.ifremer.fr/doc/00265/37576/93165.pdf https://doi.org/10.5194/bg-10-2787-2013 https://archimer.ifremer.fr/doc/00265/37576/ |
geographic |
Southern Ocean Weddell |
geographic_facet |
Southern Ocean Weddell |
genre |
ice algae Sea ice Southern Ocean |
genre_facet |
ice algae Sea ice Southern Ocean |
op_source |
Biogeosciences (1726-4170) (Copernicus Gesellschaft Mbh), 2013 , Vol. 10 , N. 4 , P. 2787-2801 |
op_relation |
https://archimer.ifremer.fr/doc/00265/37576/36778.pdf https://archimer.ifremer.fr/doc/00265/37576/93164.zip https://archimer.ifremer.fr/doc/00265/37576/93165.pdf doi:10.5194/bg-10-2787-2013 https://archimer.ifremer.fr/doc/00265/37576/ |
op_rights |
Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-10-2787-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
4 |
container_start_page |
2787 |
op_container_end_page |
2801 |
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1766026911458263040 |