Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)

Tonnard, Manon; Planquette, Hélène; Merwe, Pier van der; Gallinari, Morgane; Gésincourt, Floriane Desprez de; Germain, Yoan; Gourain, Arthur; Benetti, Marion; Reverdin, Gilles; Tréguer, Paul; Boutorh, Julia; Cheize, Marie; Barraqueta, Jan‐Lukas Menzel; Pereira-Contreira, Leonardo; Shelley, Rachel; Lherminier, Pascale; Sarthou, Géraldine

doi:10.5194/bg-2018-147

Cited by 28 publications

(44 citation statements)

References 96 publications

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“…These authors used Al as a lithogenic tracer, but here we chose to use 232 Th. Indeed, the lithogenic fractions calculated from particulate Al (PAl) concentrations were often higher than 100% in surface waters close to the margins, revealing that a fraction of the total Pal is likely in the authigenic phase (Lerner et al, 2018;Van Beueskom et al, 1997). In addition, Al being more prone to contamination was sampled with the clean rosette 240 (Gourain et al, 2019), while 232 Th used for calculation was measured in the same samples as PREEs, collected with the standard rosette.…”

Section: Comparison With Other Studiesmentioning

confidence: 99%

Particulate Rare Earth Element behavior in the North Atlantic (GEOVIDE cruise)

Lagarde¹,

Lemaitre²,

Planquette³

et al. 2020

Preprint

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Particulate concentrations of the fourteen Rare Earth Elements (PREE), yttrium and 232-thorium have been 10 measured in two hundred samples collected in the epipelagic (ca 0-200 m) and the mesopelagic (ca 200-1000 m) zones of the North Atlantic, during the GEOVIDE cruise (May/June 2014, R/V Pourquoi Pas ?, GEOTRACES GA01). Particulate cerium (PCe) concentrations vary from 0.2 pmol.L -1 to 16 pmol.L -1 , particulate neodymium (PNd) ones from 0.09 pmol.L -1 to 6.1 pmol.L-1 and particulate ytterbium (PYb) ones from 0.01 pmol.L -1 to 0.5 pmol.L -1 . PREE concentrations are higher close to the Iberian margin and on the Greenland shelf, where PREE concentrations normalized to Post Archean Australian Shale 15 (PAAS) display a positive Ce anomaly between 0.3 and 3, and a light REE (LREE) enrichment compared to heavy REE (HREE) illustrated by high PNdN/PYbN ratios (normalized to PAAS). The lithogenic fraction of the particulate REE concentration is closely related to the margin morphology and the hydrodynamic context: off the Iberian margin, up to 100% of the PREEs are lithogenic and this lithogenic input spreads westward along isopycnals as intermediate nepheloid layers (INL)up to 1700 km away. Lithogenic inputs are also observed along the Greenland and Newfoundland margins, although the 20 circulation stacks them along the coasts. PREE distributions are also controlled by the biological uptake in the surface layers and remineralization processes deeper. Low surface concentrations and some normalized REE patterns displaying a negative Ce anomaly and HREE enrichment indicate freshly formed biogenic particles. A significant relationship between biogenic silica (BSi) and PHREE is also observed in the diatom blooms occurring in the Labrador and Irminger seas. PHo/PY ratio was calculated in order to identify processes independent of the ionic radius. However, we could not firmly assess the role of the 25 iron hydroxides in the scavenging prates of these elements.

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Section: Comparison With Other Studiesmentioning

confidence: 99%

Particulate Rare Earth Element behavior in the North Atlantic (GEOVIDE cruise)

Lagarde¹,

Lemaitre²,

Planquette³

et al. 2020

Preprint

Self Cite

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“…At depth, benthic and shelf sediment resuspension (e.g. Fitzwater et al, 2000;McCave and Hall, 2002;Elrod et al, 2004;Lam and Bishop, 2008;Cullen et al, 2009;Hwang et al, 2010;Aguilar-Islas et al, 2013;Lam et al, 2015) and hydrothermal activity (Trefry et al, 1985;Elderfield and Schultz, 1996;Tagliabue et al, 2010Tagliabue et al, , 2017Lam et al, 2012) provide important amounts of particles to the water column. Moreover, authigenic particles can be produced in situ by aggregation of colloids (Bergquist et al, 2007) or oxidation processes (Bishop and Fleisher, 1987;Collier and Edmond, 1984).…”

Section: Introductionmentioning

confidence: 99%

Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section

et al. 2019

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Abstract. 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.

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“…The sampling depths are shown for each vertical profile (black dots). meets ISOW in the Iceland Basin (van Aken, 2000;McCartney, 1992;Schmitz and McCartney, 1993).…”

Section: Overflow Waters and Deepwatermentioning

confidence: 98%

“…The largest bloom was observed in the Labrador Sea in May 2014. Diatoms were the dominant species in the Irminger and Labrador seas and on the Greenland and Newfoundland margins during GA01 (up to 55 % of the total Chl a concentration; Tonnard et al, 2018). In the West European Basin, Chl a was lower in May and June 2014 and coccolithophorids were the dominant species in that area (Tonnard et al, 2018).…”

Section: Ra Removal and Its Relationship With Bamentioning

confidence: 99%

Answer to Referee 2

Roy¹

2018

Preprint

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We report detailed sections of radium-226 (226 Ra, 3028 E. Le Roy et al.: The 226 Ra-Ba relationship in the North Atlantic during GEOTRACES-GA01 shallow stations near the coasts of Greenland and Newfoundland where high 226 Ra / Ba ratios at depth reflect the diffusion of 226 Ra from sediment and low 226 Ra / Ba ratios in the upper water column reflect the input of Ba associated with meteoric waters.

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Dissolved iron in the North Atlantic Ocean and Labrador Sea along the GEOVIDE section (GEOTRACES section GA01)

Cited by 28 publications

References 96 publications

Particulate Rare Earth Element behavior in the North Atlantic (GEOVIDE cruise)

Particulate Rare Earth Element behavior in the North Atlantic (GEOVIDE cruise)

Inputs and processes affecting the distribution of particulate iron in the North Atlantic along the GEOVIDE (GEOTRACES GA01) section

Answer to Referee 2

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