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Multiple drivers of production and particle export in the western tropical North Atlantic

Authors: Korte, Laura F; Brummer, Geert-Jan A; van der Does, Michèlle; Guerreiro, Catarina V; Mienis, Furu; Munday, Chris I; Ponsoni, Leandro; +2 Authors

Multiple drivers of production and particle export in the western tropical North Atlantic

Abstract

To assess the impacts of Amazon River discharge, Saharan dust deposition, N2‐fixation and mixed‐layer deepening on the biological carbon pump, sediment traps were moored from October 2012 to November 2013 at two sites in the western tropical North Atlantic (49°W,12°N/57°W,12°N). Particle exports interpreted along with satellite‐ and Argo‐float data show peak fluxes in biogenic silica (31 mg m**−2 d**−1) and organic carbon (25 mg m**−2 d**−1) during the fall of 2013 that were ten to five times higher than any time earlier during the year. These high export fluxes occurred in tandem with high surface chlorophyll a concentrations associated with the dispersal of the Amazon River plume, following retroflection into the North‐Atlantic‐Counter‐Current. High fucoxanthin fluxes (> 80 μ g m**−2 d**−1) and low δ15N‐values (−0.6‰) suggest a large contribution by marine diatom‐diazotrophic‐associations, possibly enhanced by wet Saharan dust deposition. During summer, the Amazon River plume resulted in high mass fluxes at 57°W that were enriched in biogenic silica but weakly influenced by diazotrophic‐associations compared to the fall event at 49°W. High carbonate‐carbon fluxes (17 mg m**−2 d**−1) dominated a second single event at 49°W during spring that was likely triggered by mixed‐layer deepening. Rain‐ratios of BSi/Ccarb amounted to 1.7 when associated with high export fluxes linked to the Amazon River plume. Compared to an annual average of 0.3, this indicates a more efficient uptake of CO2 via the biological pump compared to when the plume was absent, hence supporting earlier observations that the Amazon River plume is important for ocean CO2 sequestration.

Keywords

particle export, Atlantic Ocean, argo float, satellite data, Sediment traps, primary production, NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University (NIOZ_UU)

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Funded by
EC| DUSTCO
Project
DUSTCO
Effects of atmospheric DUST deposition on COccolithophore production
  • Funder: European Commission (EC)
  • Project Code: 796802
  • Funding stream: H2020 | MSCA-IF-EF-ST
,
EC| DUSTTRAFFIC
Project
DUSTTRAFFIC
Transatlantic fluxes of Saharan dust: changing climate through fertilising the ocean?
  • Funder: European Commission (EC)
  • Project Code: 311152
  • Funding stream: FP7 | SP2 | ERC
result:project:semrel
,
NWO| TRAFFIC: Transatlantic fluxes of Saharan dust and ocean-climate impacts
Project
  • Funder: Netherlands Organisation for Scientific Research (NWO) (NWO)
  • Project Code: 822.01.008
result:project:semrel
Related to Research communities
European Marine Science
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