Wagener T. auteur aut IRD Guieu C. auteur aut IRD Losno R. auteur aut IRD Bonnet Sophie auteur aut IRD Mahowald Nathalie auteur aut IRD text journalArticle eng 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(-3) for SEPS and 13.0 +/- 6.3 ng m(-3) for SOKS. Dust fluxes, derived from those concentrations, were 9.9 +/- 3.7 mg m(-2) d(-1) for SEPS and 38 +/- 14 mg m(-2) d(-1) 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. specialized 064 22 2 NIL_1-NIL_13 2008 0886-6236 https://www.documentation.ird.fr/hor/PAR00002400 10.1029/2007GB002984 0886-6236 https://www.documentation.ird.fr/hor/PAR00002400 IRD - Base Horizon / Pleins textes 2008-05-30 2017-08-23 PAR00002400 fre