Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section
The aim of the GEOVIDE cruise (May–June 2014, R/V Pourquoi Pas? ) was to provide a better understanding of trace metal biogeochemical cycles in the North Atlantic Ocean. As marine particles play a key role in the global biogeochemical cycle of trace elements in the ocean, we discuss the distribution...
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ftdoajarticles:oai:doaj.org/article:2186b3bbc83c4dc0a90aafd27db1661d 2023-05-15T17:06:13+02:00 Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section A. Gourain H. Planquette M. Cheize N. Lemaitre J.-L. Menzel Barraqueta R. Shelley P. Lherminier G. Sarthou 2019-04-01T00:00:00Z https://doi.org/10.5194/bg-16-1563-2019 https://doaj.org/article/2186b3bbc83c4dc0a90aafd27db1661d EN eng Copernicus Publications https://www.biogeosciences.net/16/1563/2019/bg-16-1563-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-1563-2019 1726-4170 1726-4189 https://doaj.org/article/2186b3bbc83c4dc0a90aafd27db1661d Biogeosciences, Vol 16, Pp 1563-1582 (2019) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.5194/bg-16-1563-2019 2022-12-31T02:09:05Z The aim of the GEOVIDE cruise (May–June 2014, R/V Pourquoi Pas? ) was to provide a better understanding of trace metal biogeochemical cycles in the North Atlantic Ocean. As marine particles play a key role in the global biogeochemical cycle of trace elements in the ocean, we discuss the distribution of particulate iron (PFe), in relation to the distribution of particulate aluminium (PAl), manganese (PMn), and phosphorus (PP). Overall, 32 full vertical profiles were collected for trace metal analyses, representing more than 500 samples. This resolution provides a solid basis for assessing concentration distributions, elemental ratios, size fractionation, and adsorptive scavenging processes in key areas of the thermohaline overturning circulation. Total particulate iron concentrations ranged from as low as 9 pmol L −1 in surface waters of the Labrador Sea to 304 nmol L −1 near the Iberian margin, while median PFe concentrations of 1.15 nmol L −1 were measured over the sub-euphotic ocean interior. Within the Iberian Abyssal Plain, the ratio of PFe to PAl was identical to the continental crust molar ratio (0.21 mol mol −1 ), indicating the important influence of crustal particles in the water column. Overall, the lithogenic component explained more than 87% of PFe variance along the section. Within the Irminger and Labrador basins, the formation of biogenic particles led to an increase in the PFe∕PAl ratio (up to 0.64 mol mol −1 ) compared to the continental crust ratio. Continental margins induce high concentrations of particulate trace elements within the surrounding water masses (up to 10 nmol L −1 of PFe). For example, horizontal advection of PFe was visible more than 250 km away from the Iberian margin. Additionally, several benthic nepheloid layers were observed more than 200 m above the seafloor along the transect, especially in the Icelandic, Irminger, and Labrador basins, suspending particles with high PFe content of up to 89 nmol L −1 . Article in Journal/Newspaper Labrador Sea North Atlantic Directory of Open Access Journals: DOAJ Articles Pourquoi Pas ENVELOPE(135.783,135.783,-66.083,-66.083) Pourquoi-Pas ENVELOPE(-67.450,-67.450,-67.700,-67.700) Pourquoi-Pas? ENVELOPE(135.750,135.750,-66.200,-66.200) Biogeosciences 16 7 1563 1582 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 A. Gourain H. Planquette M. Cheize N. Lemaitre J.-L. Menzel Barraqueta R. Shelley P. Lherminier G. Sarthou Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The aim of the GEOVIDE cruise (May–June 2014, R/V Pourquoi Pas? ) was to provide a better understanding of trace metal biogeochemical cycles in the North Atlantic Ocean. As marine particles play a key role in the global biogeochemical cycle of trace elements in the ocean, we discuss the distribution of particulate iron (PFe), in relation to the distribution of particulate aluminium (PAl), manganese (PMn), and phosphorus (PP). Overall, 32 full vertical profiles were collected for trace metal analyses, representing more than 500 samples. This resolution provides a solid basis for assessing concentration distributions, elemental ratios, size fractionation, and adsorptive scavenging processes in key areas of the thermohaline overturning circulation. Total particulate iron concentrations ranged from as low as 9 pmol L −1 in surface waters of the Labrador Sea to 304 nmol L −1 near the Iberian margin, while median PFe concentrations of 1.15 nmol L −1 were measured over the sub-euphotic ocean interior. Within the Iberian Abyssal Plain, the ratio of PFe to PAl was identical to the continental crust molar ratio (0.21 mol mol −1 ), indicating the important influence of crustal particles in the water column. Overall, the lithogenic component explained more than 87% of PFe variance along the section. Within the Irminger and Labrador basins, the formation of biogenic particles led to an increase in the PFe∕PAl ratio (up to 0.64 mol mol −1 ) compared to the continental crust ratio. Continental margins induce high concentrations of particulate trace elements within the surrounding water masses (up to 10 nmol L −1 of PFe). For example, horizontal advection of PFe was visible more than 250 km away from the Iberian margin. Additionally, several benthic nepheloid layers were observed more than 200 m above the seafloor along the transect, especially in the Icelandic, Irminger, and Labrador basins, suspending particles with high PFe content of up to 89 nmol L −1 . |
format |
Article in Journal/Newspaper |
author |
A. Gourain H. Planquette M. Cheize N. Lemaitre J.-L. Menzel Barraqueta R. Shelley P. Lherminier G. Sarthou |
author_facet |
A. Gourain H. Planquette M. Cheize N. Lemaitre J.-L. Menzel Barraqueta R. Shelley P. Lherminier G. Sarthou |
author_sort |
A. Gourain |
title |
Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section |
title_short |
Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section |
title_full |
Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section |
title_fullStr |
Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section |
title_full_unstemmed |
Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section |
title_sort |
inputs and processes affecting the distribution of particulate iron in the north atlantic along the geovide (geotraces ga01) section |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-16-1563-2019 https://doaj.org/article/2186b3bbc83c4dc0a90aafd27db1661d |
long_lat |
ENVELOPE(135.783,135.783,-66.083,-66.083) ENVELOPE(-67.450,-67.450,-67.700,-67.700) ENVELOPE(135.750,135.750,-66.200,-66.200) |
geographic |
Pourquoi Pas Pourquoi-Pas Pourquoi-Pas? |
geographic_facet |
Pourquoi Pas Pourquoi-Pas Pourquoi-Pas? |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_source |
Biogeosciences, Vol 16, Pp 1563-1582 (2019) |
op_relation |
https://www.biogeosciences.net/16/1563/2019/bg-16-1563-2019.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-16-1563-2019 1726-4170 1726-4189 https://doaj.org/article/2186b3bbc83c4dc0a90aafd27db1661d |
op_doi |
https://doi.org/10.5194/bg-16-1563-2019 |
container_title |
Biogeosciences |
container_volume |
16 |
container_issue |
7 |
container_start_page |
1563 |
op_container_end_page |
1582 |
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1766061249410367488 |