Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal
The distribution of dissolved aluminium (dAl) in the water column of the North Atlantic and Labrador Sea was studied along GEOTRACES section GA01 to unravel the sources and sinks of this element. Surface water dAl concentrations were low (median of 2.5 nM) due to low aerosol deposition and removal b...
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ftcopernicus:oai:publications.copernicus.org:bg66264 2023-05-15T16:29:57+02:00 Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal Menzel Barraqueta, Jan-Lukas Schlosser, Christian Planquette, Hélène Gourain, Arthur Cheize, Marie Boutorh, Julia Shelley, Rachel Contreira Pereira, Leonardo Gledhill, Martha Hopwood, Mark J. Lacan, François Lherminier, Pascale Sarthou, Geraldine Achterberg, Eric P. 2019-01-18 application/pdf https://doi.org/10.5194/bg-15-5271-2018 https://www.biogeosciences.net/15/5271/2018/ eng eng doi:10.5194/bg-15-5271-2018 https://www.biogeosciences.net/15/5271/2018/ eISSN: 1726-4189 Text 2019 ftcopernicus https://doi.org/10.5194/bg-15-5271-2018 2019-12-24T09:49:57Z The distribution of dissolved aluminium (dAl) in the water column of the North Atlantic and Labrador Sea was studied along GEOTRACES section GA01 to unravel the sources and sinks of this element. Surface water dAl concentrations were low (median of 2.5 nM) due to low aerosol deposition and removal by biogenic particles (i.e. phytoplankton cells). However, surface water dAl concentrations were enhanced on the Iberian and Greenland shelves (up to 30.9 nM) due to continental inputs (rivers, glacial flour, and ice melt). Dissolved Al in surface waters scaled negatively with chlorophyll a and biogenic silica (opal) concentrations. The abundance of diatoms exerted a significant ( p <0.01 ) control on the surface particulate Al (pAl) to dAl ratios by decreasing dAl levels and increasing pAl levels. Dissolved Al concentrations generally increased with depth and correlated strongly with silicic acid ( R 2 >0.76 ) west of the Iberian Basin, suggesting net release of dAl at depth during remineralization of sinking opal-containing particles. Enrichment of dAl at near-bottom depths was observed due to the resuspension of sediments. The highest dAl concentrations (up to 38.7 nM) were observed in Mediterranean Outflow Waters, which act as a major source of dAl to mid-depth waters of the eastern North Atlantic. This study clearly shows that the vertical and lateral distributions of dAl in the North Atlantic differ when compared to other regions of the Atlantic and global oceans. Responsible for these large inter- and intra-basin differences are the large spatial variabilities in the main Al source, atmospheric deposition, and the main Al sink, particle scavenging by biogenic particles. Text Greenland Labrador Sea North Atlantic Copernicus Publications: E-Journals Greenland Biogeosciences 15 16 5271 5286 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The distribution of dissolved aluminium (dAl) in the water column of the North Atlantic and Labrador Sea was studied along GEOTRACES section GA01 to unravel the sources and sinks of this element. Surface water dAl concentrations were low (median of 2.5 nM) due to low aerosol deposition and removal by biogenic particles (i.e. phytoplankton cells). However, surface water dAl concentrations were enhanced on the Iberian and Greenland shelves (up to 30.9 nM) due to continental inputs (rivers, glacial flour, and ice melt). Dissolved Al in surface waters scaled negatively with chlorophyll a and biogenic silica (opal) concentrations. The abundance of diatoms exerted a significant ( p <0.01 ) control on the surface particulate Al (pAl) to dAl ratios by decreasing dAl levels and increasing pAl levels. Dissolved Al concentrations generally increased with depth and correlated strongly with silicic acid ( R 2 >0.76 ) west of the Iberian Basin, suggesting net release of dAl at depth during remineralization of sinking opal-containing particles. Enrichment of dAl at near-bottom depths was observed due to the resuspension of sediments. The highest dAl concentrations (up to 38.7 nM) were observed in Mediterranean Outflow Waters, which act as a major source of dAl to mid-depth waters of the eastern North Atlantic. This study clearly shows that the vertical and lateral distributions of dAl in the North Atlantic differ when compared to other regions of the Atlantic and global oceans. Responsible for these large inter- and intra-basin differences are the large spatial variabilities in the main Al source, atmospheric deposition, and the main Al sink, particle scavenging by biogenic particles. |
format |
Text |
author |
Menzel Barraqueta, Jan-Lukas Schlosser, Christian Planquette, Hélène Gourain, Arthur Cheize, Marie Boutorh, Julia Shelley, Rachel Contreira Pereira, Leonardo Gledhill, Martha Hopwood, Mark J. Lacan, François Lherminier, Pascale Sarthou, Geraldine Achterberg, Eric P. |
spellingShingle |
Menzel Barraqueta, Jan-Lukas Schlosser, Christian Planquette, Hélène Gourain, Arthur Cheize, Marie Boutorh, Julia Shelley, Rachel Contreira Pereira, Leonardo Gledhill, Martha Hopwood, Mark J. Lacan, François Lherminier, Pascale Sarthou, Geraldine Achterberg, Eric P. Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal |
author_facet |
Menzel Barraqueta, Jan-Lukas Schlosser, Christian Planquette, Hélène Gourain, Arthur Cheize, Marie Boutorh, Julia Shelley, Rachel Contreira Pereira, Leonardo Gledhill, Martha Hopwood, Mark J. Lacan, François Lherminier, Pascale Sarthou, Geraldine Achterberg, Eric P. |
author_sort |
Menzel Barraqueta, Jan-Lukas |
title |
Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal |
title_short |
Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal |
title_full |
Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal |
title_fullStr |
Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal |
title_full_unstemmed |
Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal |
title_sort |
aluminium in the north atlantic ocean and the labrador sea (geotraces ga01 section): roles of continental inputs and biogenic particle removal |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-15-5271-2018 https://www.biogeosciences.net/15/5271/2018/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Labrador Sea North Atlantic |
genre_facet |
Greenland Labrador Sea North Atlantic |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-15-5271-2018 https://www.biogeosciences.net/15/5271/2018/ |
op_doi |
https://doi.org/10.5194/bg-15-5271-2018 |
container_title |
Biogeosciences |
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15 |
container_issue |
16 |
container_start_page |
5271 |
op_container_end_page |
5286 |
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1766019654059294720 |