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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ftcopernicus:oai:publications.copernicus.org:bg69100 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 Gourain, Arthur Planquette, Hélène Cheize, Marie Lemaitre, Nolwenn Menzel Barraqueta, Jan-Lukas Shelley, Rachel Lherminier, Pascale Sarthou, Géraldine 2019-04-12 application/pdf https://doi.org/10.5194/bg-16-1563-2019 https://www.biogeosciences.net/16/1563/2019/ eng eng doi:10.5194/bg-16-1563-2019 https://www.biogeosciences.net/16/1563/2019/ eISSN: 1726-4189 Text 2019 ftcopernicus https://doi.org/10.5194/bg-16-1563-2019 2019-12-24T09:49:18Z 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 . Text Labrador Sea North Atlantic Copernicus Publications: E-Journals 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 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 |
Text |
author |
Gourain, Arthur Planquette, Hélène Cheize, Marie Lemaitre, Nolwenn Menzel Barraqueta, Jan-Lukas Shelley, Rachel Lherminier, Pascale Sarthou, Géraldine |
spellingShingle |
Gourain, Arthur Planquette, Hélène Cheize, Marie Lemaitre, Nolwenn Menzel Barraqueta, Jan-Lukas Shelley, Rachel Lherminier, Pascale Sarthou, Géraldine Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section |
author_facet |
Gourain, Arthur Planquette, Hélène Cheize, Marie Lemaitre, Nolwenn Menzel Barraqueta, Jan-Lukas Shelley, Rachel Lherminier, Pascale Sarthou, Géraldine |
author_sort |
Gourain, Arthur |
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 |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-16-1563-2019 https://www.biogeosciences.net/16/1563/2019/ |
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 |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-16-1563-2019 https://www.biogeosciences.net/16/1563/2019/ |
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 |
_version_ |
1766061248550535168 |