Atmospheric deposition fluxes over the Atlantic Ocean : a GEOTRACES case study

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dc.contributor.authorBarraqueta, Jan-Lukas Menzelen_ZA
dc.contributor.authorKlar, Jessica K.en_ZA
dc.contributor.authorGledhill, Marthaen_ZA
dc.contributor.authorSchlosser, Christianen_ZA
dc.contributor.authorShelley, Rachelen_ZA
dc.contributor.authorPlanquette, Helene F.en_ZA
dc.contributor.authorWenzel, Bernharden_ZA
dc.contributor.authorSarthou, Geraldineen_ZA
dc.contributor.authorAchterberg, Eric P.en_ZA
dc.date.accessioned2021-08-16T11:48:04Z
dc.date.available2021-08-16T11:48:04Z
dc.date.issued2019-04-11
dc.descriptionCITATION: Barraqueta, J., et al. 2019. Atmospheric deposition fluxes over the Atlantic Ocean : a GEOTRACES case study. Biogeosciences, 16:1525–1542. doi:10.5194/bg-16-1525-2019
dc.descriptionThe original publication is available at https://www.biogeosciences.net/
dc.description.abstractAtmospheric deposition is an important source of micronutrients to the ocean, but atmospheric deposition fluxes remain poorly constrained in most ocean regions due to the limited number of field observations of wet and dry atmospheric inputs. Here we present the distribution of dissolved aluminium (dAl), as a tracer of atmospheric inputs, in surface waters of the Atlantic Ocean along GEOTRACES sections GA01, GA06, GA08, and GA10. We used the surface mixed-layer concentrations of dAl to calculate atmospheric deposition fluxes using a simple steady state model. We have optimized the Al fractional aerosol solubility, the dAl residence time within the surface mixed layer and the depth of the surface mixed layer for each separate cruise to calculate the atmospheric deposition fluxes. We calculated the lowest deposition fluxes of 0.15±0.1 and 0.27±0.13 g m−2 yr−1 for the South and North Atlantic Ocean (>40∘ S and >40∘ N) respectively, and the highest fluxes of 1.8 and 3.09 g m−2 yr−1 for the south-east Atlantic and tropical Atlantic Ocean, respectively. Overall, our estimations are comparable to atmospheric dust deposition model estimates and reported field-based atmospheric deposition estimates. We note that our estimates diverge from atmospheric dust deposition model flux estimates in regions influenced by riverine Al inputs and in upwelling regions. As dAl is a key trace element in the GEOTRACES programme, the approach presented in this study allows calculations of atmospheric deposition fluxes at high spatial resolution for remote ocean regions.en_ZA
dc.description.sponsorshipDepartment of Scientific Politics of the Basque Government
dc.description.sponsorshipGEOMAR Helmholtz Center for Ocean Research Kiel
dc.description.urihttps://bg.copernicus.org/articles/16/1525/2019/
dc.description.versionPublisher’s version
dc.format.extent18 pages : illustrations (some color), mapsen_ZA
dc.identifier.citationBarraqueta, J., et al. 2019. Atmospheric deposition fluxes over the Atlantic Ocean : a GEOTRACES case study. Biogeosciences, 16:1525–1542. doi:10.5194/bg-16-1525-2019
dc.identifier.issn1726-4189 (online)
dc.identifier.issn1726-4170 (print)
dc.identifier.otherdoi:10.5194/bg-16-1525-2019
dc.identifier.urihttp://hdl.handle.net/10019.1/110852
dc.language.isoen_ZAen_ZA
dc.publisherCopernicus Publications
dc.rights.holderAuthors retain copyright
dc.subjectGEOTRACESen_ZA
dc.subjectAtmospheric deposition -- Atlantic Oceanen_ZA
dc.subjectMicronutrientsen_ZA
dc.subjectAtmospheric deposition -- Measurement -- Mathematical modelsen_ZA
dc.titleAtmospheric deposition fluxes over the Atlantic Ocean : a GEOTRACES case studyen_ZA
dc.typeArticleen_ZA
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