Determination of the distribution of dissolved organic carbon in the Indian sector of the Southern Ocean
During France JGOFS campaign ANTARES 2 (R.V. Marion Dufresne), samples were taken along a section of the 62 degrees E meridian from 49 degrees to 66 degrees S. The high temperature catalytic oxidation (HTCO) method was used to determine the concentration of dissolved organic carbon (DOC). The analys...
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Elsevier Science Bv
1998
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Online Access: | https://archimer.ifremer.fr/doc/00100/21113/18933.pdf https://doi.org/10.1016/S0304-4203(98)00014-0 https://archimer.ifremer.fr/doc/00100/21113/ |
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ftarchimer:oai:archimer.ifremer.fr:21113 2023-05-15T13:47:21+02:00 Determination of the distribution of dissolved organic carbon in the Indian sector of the Southern Ocean Wiebinga, Cj De Baar, Hjw 1998-08 application/pdf https://archimer.ifremer.fr/doc/00100/21113/18933.pdf https://doi.org/10.1016/S0304-4203(98)00014-0 https://archimer.ifremer.fr/doc/00100/21113/ eng eng Elsevier Science Bv https://archimer.ifremer.fr/doc/00100/21113/18933.pdf doi:10.1016/S0304-4203(98)00014-0 https://archimer.ifremer.fr/doc/00100/21113/ 1998 Elsevier Science B.V. Ali rights reserved. info:eu-repo/semantics/openAccess restricted use Marine Chemistry (0304-4203) (Elsevier Science Bv), 1998-08 , Vol. 61 , N. 3-4 , P. 185-201 dissolved organic carbon (DOC) apparent oxygen utilization (AOU) bacterioplankton mineralisation text Publication info:eu-repo/semantics/article 1998 ftarchimer https://doi.org/10.1016/S0304-4203(98)00014-0 2021-09-23T20:21:24Z During France JGOFS campaign ANTARES 2 (R.V. Marion Dufresne), samples were taken along a section of the 62 degrees E meridian from 49 degrees to 66 degrees S. The high temperature catalytic oxidation (HTCO) method was used to determine the concentration of dissolved organic carbon (DOC). The analyses were conducted both on-board ship and after the cruise in the laboratory. Collecting and storing acidified samples for post-cruise analysis induced no significant differences. The use of two separate but identical channels on the carbon analyzer increased the number of samples analysed per day and allowed independent monitoring of the instrument blank and the calibration of the detector response. The mixed layer concentrations of organic carbon varied from about 52 mu M C in the Antarctic Divergence (64 degrees S) to about 63 mu M C in the Polar Frontal Zone (49 degrees S). Vertical profiles showed a slight, but significant, decrease in organic carbon below the mixed layer, to about 42 mu M C below 2000 m across the transect. The homogeneity and low concentration of organic carbon in deep water is consistent with values recently reported for the equatorial Atlantic and Pacific Ocean and supports the evidence for a constant deep water DOC concentration. In addition, this provides a verification of the instrument performance, thus validating observed DOC data trends and allowing a comparison with the 'modern' DOC literature. In general, the organic carbon concentration in the mixed layer was lower than previously published data of the main ocean basins, which might -reflect the low chlorophyll a concentration (< 0.5 mu g/l) encountered in this region. Along the 62 degrees E meridian section, organic carbon showed a trend with corresponding measurements of phytoplankton biomass and bacterial production, underlining the dependence of bacterial growth on a pool of 'freshly' produced DOG. Organic carbon was found to exhibit a weak inverse trend versus apparent oxygen utilization (AOU). This suggests that only a small part of the oxygen consumption is due to the mineralisation of DOG. (C) 1998 Elsevier Science B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Indian Pacific Southern Ocean The Antarctic Marine Chemistry 61 3-4 185 201 |
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 |
topic |
dissolved organic carbon (DOC) apparent oxygen utilization (AOU) bacterioplankton mineralisation |
spellingShingle |
dissolved organic carbon (DOC) apparent oxygen utilization (AOU) bacterioplankton mineralisation Wiebinga, Cj De Baar, Hjw Determination of the distribution of dissolved organic carbon in the Indian sector of the Southern Ocean |
topic_facet |
dissolved organic carbon (DOC) apparent oxygen utilization (AOU) bacterioplankton mineralisation |
description |
During France JGOFS campaign ANTARES 2 (R.V. Marion Dufresne), samples were taken along a section of the 62 degrees E meridian from 49 degrees to 66 degrees S. The high temperature catalytic oxidation (HTCO) method was used to determine the concentration of dissolved organic carbon (DOC). The analyses were conducted both on-board ship and after the cruise in the laboratory. Collecting and storing acidified samples for post-cruise analysis induced no significant differences. The use of two separate but identical channels on the carbon analyzer increased the number of samples analysed per day and allowed independent monitoring of the instrument blank and the calibration of the detector response. The mixed layer concentrations of organic carbon varied from about 52 mu M C in the Antarctic Divergence (64 degrees S) to about 63 mu M C in the Polar Frontal Zone (49 degrees S). Vertical profiles showed a slight, but significant, decrease in organic carbon below the mixed layer, to about 42 mu M C below 2000 m across the transect. The homogeneity and low concentration of organic carbon in deep water is consistent with values recently reported for the equatorial Atlantic and Pacific Ocean and supports the evidence for a constant deep water DOC concentration. In addition, this provides a verification of the instrument performance, thus validating observed DOC data trends and allowing a comparison with the 'modern' DOC literature. In general, the organic carbon concentration in the mixed layer was lower than previously published data of the main ocean basins, which might -reflect the low chlorophyll a concentration (< 0.5 mu g/l) encountered in this region. Along the 62 degrees E meridian section, organic carbon showed a trend with corresponding measurements of phytoplankton biomass and bacterial production, underlining the dependence of bacterial growth on a pool of 'freshly' produced DOG. Organic carbon was found to exhibit a weak inverse trend versus apparent oxygen utilization (AOU). This suggests that only a small part of the oxygen consumption is due to the mineralisation of DOG. (C) 1998 Elsevier Science B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Wiebinga, Cj De Baar, Hjw |
author_facet |
Wiebinga, Cj De Baar, Hjw |
author_sort |
Wiebinga, Cj |
title |
Determination of the distribution of dissolved organic carbon in the Indian sector of the Southern Ocean |
title_short |
Determination of the distribution of dissolved organic carbon in the Indian sector of the Southern Ocean |
title_full |
Determination of the distribution of dissolved organic carbon in the Indian sector of the Southern Ocean |
title_fullStr |
Determination of the distribution of dissolved organic carbon in the Indian sector of the Southern Ocean |
title_full_unstemmed |
Determination of the distribution of dissolved organic carbon in the Indian sector of the Southern Ocean |
title_sort |
determination of the distribution of dissolved organic carbon in the indian sector of the southern ocean |
publisher |
Elsevier Science Bv |
publishDate |
1998 |
url |
https://archimer.ifremer.fr/doc/00100/21113/18933.pdf https://doi.org/10.1016/S0304-4203(98)00014-0 https://archimer.ifremer.fr/doc/00100/21113/ |
geographic |
Antarctic Indian Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Indian Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Marine Chemistry (0304-4203) (Elsevier Science Bv), 1998-08 , Vol. 61 , N. 3-4 , P. 185-201 |
op_relation |
https://archimer.ifremer.fr/doc/00100/21113/18933.pdf doi:10.1016/S0304-4203(98)00014-0 https://archimer.ifremer.fr/doc/00100/21113/ |
op_rights |
1998 Elsevier Science B.V. Ali rights reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/S0304-4203(98)00014-0 |
container_title |
Marine Chemistry |
container_volume |
61 |
container_issue |
3-4 |
container_start_page |
185 |
op_container_end_page |
201 |
_version_ |
1766246963634765824 |