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Article Dans Une Revue Global Biogeochemical Cycles Année : 2008

Revisiting atmospheric dust export to the Southern Hemisphere ocean: Biogeochemical implications

Résumé

Aerosol concentrations in the Southern Hemisphere are largely undersampled. This study presents a chemical and physical description of dust particles collected on board research vessels in the southeast Pacific (SEPS) and the Southern Ocean (SOKS). Concentrations of dust were 6.1 ± 2.4 ng m À3 for SEPS and 13.0 ± 6.3 ng m À3 for SOKS. Dust fluxes, derived from those concentrations, were 9.9 ± 3.7 mg m À2 d À1 for SEPS and 38 ± 14 mg m À2 d À1 for SOKS and are shown to be representative of actual fluxes in those areas. Dust and iron deposition are up to 2 orders of magnitude lower than former predictions. A map of dust deposition on the Southern Hemisphere is proposed by incorporating those in situ measurements into a dust model. This study confirms that dust deposition is not the dominant source of iron to the large high-nutrient low-chlorophyll Southern Ocean.
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Dates et versions

hal-02567410 , version 1 (09-04-2021)

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Thibaut Wagener, Cécile Guieu, Rémi Losno, Sophie Bonnet, Natalie Mahowald. Revisiting atmospheric dust export to the Southern Hemisphere ocean: Biogeochemical implications. Global Biogeochemical Cycles, 2008, 22 (2), pp.n/a-n/a. ⟨10.1029/2007GB002984⟩. ⟨hal-02567410⟩
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