Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Sarthou, Géraldine; Lherminier, Pascale; Achterberg, Eric P.; Pérez, Fernando; Bucciarelli, Eva; Boutorh, Julia; Vincent, Bernard; Boyle, Edward A.; Branellec, Pierre; Carracedo, Lidia I.; Casacuberta, Núria; Castrillejo, Maxi; Cheize, Marie; Pereira, Pere Contreira; Cossa, Daniel; Daniault, Nathalie; Saint-Léger, Emmanuel de; Dehairs, Frank; Deng, Feifei; Gésincourt, Floriane Desprez de; Devesa, Jérémy; Foliot, lorna; Fonseca-Batista, Debany; Gallinari, Morgane; García-Ibáñez, Maribel I.; Gourain, Arthur; Grossteffan, Emilie; Hamon, Michel; Heimbürger, Lars-Éric; Henderson, Gideon M.; Jeandel, Catherine; Kermabon, Catherine; Lacan, F.; Bot, Philippe Le; Goff, Manon Le; Roy, Emilie Le; Lefèbvre, Alison; Leizour, Stéphane; Lemaitre, Nolwenn; Masqué, Pere; Ménage, Olivier; Barraqueta, Jan-Lukas Menzel; Mercier, Herlé; Perault, Fabien; Pérez, Fíz F.; Planquette, Hélène; Planchon, F.; Roukaerts, Arnout; Sanial, Virginie; Sauzède, Raphaëlle; Shelley, Rachel; Stewart, Gillian; Sutton, Jill; Tang, Yi; Tisnérat‐Laborde, Nadine; Tonnard, Manon; Tréguer, Paul; Beek, Pieter van; Zurbrick, Cheryl M.; Zunino, Patricia

doi:10.5194/bg-2018-312

Cited by 7 publications

(14 citation statements)

References 60 publications

(85 reference statements)

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“…DSOW, Denmark Strait Overflow Water; ISOW, Iceland Scotland Overflow Water; LSW, Labrador Sea Water; MOW, Mediterranean Outflow Water; NEACW, North East Atlantic Central Water; NEADW, North East Atlantic Deep Water; IcSPMW, Iceland Sub-Polar Mode Water; IrSPMW, Irminger Sub-Polar Mode Water; SAIW, Sub-Arctic Intermediate Water. Plots created in Ocean Data View (Schlitzer, 2018).…”

Section: Sampling and Processingmentioning

confidence: 99%

“…The test determined no significant difference (i-p value = 0.2-0.3) within analytical uncertainty comparing the two profiles. The dAl dataset has thus been successfully intercalibrated through GEOTRACES, included in the Intermediate Data Product 2017 (Schlitzer et al, 2018) and submitted to the British Oceanographic Data Centre (BODC; https://www.bodc.ac.uk/, last access: 7 September 2017).…”

Section: Dissolved Al Analysismentioning

confidence: 99%

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Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal

et al. 2018

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Abstract. 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 (R2>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.

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Section: Sampling and Processingmentioning

confidence: 99%

Section: Dissolved Al Analysismentioning

confidence: 99%

Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal

et al. 2018

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“…previous OVIDE campaigns enabled the optimal strategy for TEI sampling and provided help for the interpretation of the distribution of TEIs in the subpolar North Atlantic (García-Ibáñez et al, 2015). In addition to the OVIDE line, the Labrador Sea section provided a unique opportunity to study TEI distributions along the boundary current of the western North Atlantic subpolar gyre (Sarthou et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Distributions of total and size-fractionated particulate <sup>210</sup>Po and <sup>210</sup>Pb activities along the North Atlantic GEOTRACES GA01 transect: GEOVIDE cruise

et al. 2018

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Abstract. Vertical distributions of total and particulate polonium-210 (210Po) and lead-210 (210Pb) activities in the water column were measured at 11 stations in the North Atlantic during the GEOTRACES GA01 transect: GEOVIDE cruise in May–June 2014. Total 210Po activity was on average 24 % lower than 210Pb activity in the upper 100 m, and it was closer to unity in the mesopelagic (100–1000 m). The partitioning coefficients (Kd) along the transect suggest the preferential association of 210Po relative to 210Pb onto particles. The prominent role of small particles in sorption was confirmed by the observation that over 80 % of the particulate radionuclide activity was on small particles. To account for the observed surface water 210Po ∕ 210Pb disequilibria, particulate radionuclide activities and export of both small (1–53 µm) and large (>53 µm) particles must be considered. A comparison between the GEOVIDE total particulate 210Po ∕ 210Pb activity ratios (ARs) and the ratios in previous studies revealed a distinct geographic distribution, with lower particulate ARs in the high-latitude North Atlantic (including this study) and Arctic in relation to all other samples. For the samples where apparent oxygen utilization (AOU) was calculated at the same depth and time as the 210Po ∕ 210Pb AR (40 stations including this study), there was a two-phase correlation between the total particulate AR and AOU, likely reflecting the nature of the particles and demonstrating the forces of remineralization and radionuclide decay from particles as they age.

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“…Red arrows show the location of the Tagus estuary and the northward direction of the Tagus plume. Plot created in Ocean Data View (Schlitzer, 2018).…”

Section: Atmospheric Depositionmentioning

confidence: 99%

Responses to referee 1

Barraqueta¹

2018

Preprint

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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 intrabasin differences are the large spatial variabilities in the main Al source, atmospheric deposition, and the main Al sink, particle scavenging by biogenic particles.

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Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Cited by 7 publications

References 60 publications

Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal

Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal

Distributions of total and size-fractionated particulate <sup>210</sup>Po and <sup>210</sup>Pb activities along the North Atlantic GEOTRACES GA01 transect: GEOVIDE cruise

Responses to referee 1

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Introduction to the French GEOTRACES North Atlantic Transect (GA01): GEOVIDE cruise

Cited by 7 publications

References 60 publications

Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal

Aluminium in the North Atlantic Ocean and the Labrador Sea (GEOTRACES GA01 section): roles of continental inputs and biogenic particle removal

Distributions of total and size-fractionated particulate &lt;sup&gt;210&lt;/sup&gt;Po and &lt;sup&gt;210&lt;/sup&gt;Pb activities along the North Atlantic GEOTRACES GA01 transect: GEOVIDE cruise

Responses to referee 1

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Distributions of total and size-fractionated particulate <sup>210</sup>Po and <sup>210</sup>Pb activities along the North Atlantic GEOTRACES GA01 transect: GEOVIDE cruise