Data/hora: 04/06/2024 11:38:45

Provedor de dados: | 5
País: | France
Título: | Atmospheric aerosoldeposition fluxes over the Atlantic Ocean: A GEOTRACES case study
Autores: | Menzel Barraqueta, Jan-lukas; Klar, Jessica K.; Gledhill, Martha; Schlosser, Christian; Shelley, Rachel; Planquette, Helene; Wenzel, Bernhard; Sarthou, Geraldine; Achterberg, Eric P.
Data: | 2019-04
Ano: | 2019
Resumo: | Atmospheric 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 aerosol Al fractional solubility, dAl residence time within the surface mixed layer and 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 (&gt; 40° S and &gt; 40° N), respectively, and highest fluxes of 2.67 ± 1.96 and 3.82 ± 2.72 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.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/00485/59675/62745.pdf

https://archimer.ifremer.fr/doc/00485/59675/62746.pdf

https://archimer.ifremer.fr/doc/00485/59675/63670.pdf

https://archimer.ifremer.fr/doc/00485/59675/63671.pdf

DOI:10.5194/bg-2018-209

https://archimer.ifremer.fr/doc/00485/59675/

Editor: | Copernicus GmbH
Formato: | application/pdf
Fonte: | Biogeosciences (1726-4189) (Copernicus GmbH), 2019-04 , Vol. 16 , N. 7 , P. 1525-1542

Fonte:

info:eu-repo/semantics/openAccess

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