Multiple drivers of production and particle export in the western tropical North Atlantic
To assess the impacts of Amazon River discharge, Saharan dust deposition, N2-fixation and mixed-layer deepening on the biological carbon pump, sediment traps were moored from October 2012 to November 2013 at two sites in the western tropical North Atlantic (49W,12N/57W,12N). Particle exports interpr...
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Language: | Old English |
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ftzenodo:oai:zenodo.org:3831500 2024-09-15T18:21:50+00:00 Multiple drivers of production and particle export in the western tropical North Atlantic Korte, Laura F. Brummer, Geert-Jan A. Van der Does, Michèlle Guerreiro, Catarina V. Mienis, Furu Munday, Chris I. Ponsoni, Leandro Schouten, Stefan Stuut, Jan-Berend, W. 2020-02-15 https://doi.org/10.1002/lno.11442 ang ang Zenodo https://doi.org/10.1002/lno.11442 oai:zenodo.org:3831500 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/article 2020 ftzenodo https://doi.org/10.1002/lno.11442 2024-07-25T17:53:04Z To assess the impacts of Amazon River discharge, Saharan dust deposition, N2-fixation and mixed-layer deepening on the biological carbon pump, sediment traps were moored from October 2012 to November 2013 at two sites in the western tropical North Atlantic (49W,12N/57W,12N). Particle exports interpreted along with satellite- and Argo-float data show peakfluxes in biogenic silica (31 mg m−2d−1) and organic carbon (25 mg m−2d−1) during the fall of 2013 that were ten tofive times higher than any time earlier during the year. These high exportfluxes occurred in tandem with high surface chlorophyllaconcentrations associated with the dispersal of the Amazon River plume, following retroflection into the North-Atlantic-Counter-Current. High fucoxanthinfluxes (> 80μg m−2d−1) and lowδ15N-values (−0.6‰) suggest a large contribution by marine diatom-diazotrophic-associations, possibly enhanced by wet Saharan dust deposition. During summer, the Amazon River plume resulted in high massfluxes at 57W that were enriched in biogenic silica but weakly influenced by diazotrophic-associations compared to the fall event at 49W. High carbonate-carbonfluxes (17 mg m−2d−1) dominated a second single event at 49W during spring that was likely triggered by mixed- layer deepening. Rain-ratios of BSi/Ccarbamounted to 1.7 when associated with high exportfluxes linked to the Amazon River plume. Compared to an annual average of 0.3, this indicates a more efficient uptake of CO2via the biological pump compared to when the plume was absent, hence supporting earlier observations that the Amazon River plume is important for ocean CO2sequestration. Article in Journal/Newspaper North Atlantic Zenodo Limnology and Oceanography 65 9 2108 2124 |
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ftzenodo |
language |
Old English |
description |
To assess the impacts of Amazon River discharge, Saharan dust deposition, N2-fixation and mixed-layer deepening on the biological carbon pump, sediment traps were moored from October 2012 to November 2013 at two sites in the western tropical North Atlantic (49W,12N/57W,12N). Particle exports interpreted along with satellite- and Argo-float data show peakfluxes in biogenic silica (31 mg m−2d−1) and organic carbon (25 mg m−2d−1) during the fall of 2013 that were ten tofive times higher than any time earlier during the year. These high exportfluxes occurred in tandem with high surface chlorophyllaconcentrations associated with the dispersal of the Amazon River plume, following retroflection into the North-Atlantic-Counter-Current. High fucoxanthinfluxes (> 80μg m−2d−1) and lowδ15N-values (−0.6‰) suggest a large contribution by marine diatom-diazotrophic-associations, possibly enhanced by wet Saharan dust deposition. During summer, the Amazon River plume resulted in high massfluxes at 57W that were enriched in biogenic silica but weakly influenced by diazotrophic-associations compared to the fall event at 49W. High carbonate-carbonfluxes (17 mg m−2d−1) dominated a second single event at 49W during spring that was likely triggered by mixed- layer deepening. Rain-ratios of BSi/Ccarbamounted to 1.7 when associated with high exportfluxes linked to the Amazon River plume. Compared to an annual average of 0.3, this indicates a more efficient uptake of CO2via the biological pump compared to when the plume was absent, hence supporting earlier observations that the Amazon River plume is important for ocean CO2sequestration. |
format |
Article in Journal/Newspaper |
author |
Korte, Laura F. Brummer, Geert-Jan A. Van der Does, Michèlle Guerreiro, Catarina V. Mienis, Furu Munday, Chris I. Ponsoni, Leandro Schouten, Stefan Stuut, Jan-Berend, W. |
spellingShingle |
Korte, Laura F. Brummer, Geert-Jan A. Van der Does, Michèlle Guerreiro, Catarina V. Mienis, Furu Munday, Chris I. Ponsoni, Leandro Schouten, Stefan Stuut, Jan-Berend, W. Multiple drivers of production and particle export in the western tropical North Atlantic |
author_facet |
Korte, Laura F. Brummer, Geert-Jan A. Van der Does, Michèlle Guerreiro, Catarina V. Mienis, Furu Munday, Chris I. Ponsoni, Leandro Schouten, Stefan Stuut, Jan-Berend, W. |
author_sort |
Korte, Laura F. |
title |
Multiple drivers of production and particle export in the western tropical North Atlantic |
title_short |
Multiple drivers of production and particle export in the western tropical North Atlantic |
title_full |
Multiple drivers of production and particle export in the western tropical North Atlantic |
title_fullStr |
Multiple drivers of production and particle export in the western tropical North Atlantic |
title_full_unstemmed |
Multiple drivers of production and particle export in the western tropical North Atlantic |
title_sort |
multiple drivers of production and particle export in the western tropical north atlantic |
publisher |
Zenodo |
publishDate |
2020 |
url |
https://doi.org/10.1002/lno.11442 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://doi.org/10.1002/lno.11442 oai:zenodo.org:3831500 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.1002/lno.11442 |
container_title |
Limnology and Oceanography |
container_volume |
65 |
container_issue |
9 |
container_start_page |
2108 |
op_container_end_page |
2124 |
_version_ |
1810460814274985984 |