Tagliabue A. auteur aut IRD Bopp L. auteur aut IRD Aumont Olivier auteur aut IRD text journalArticle eng The predominant iron sources to the Southern Ocean (SO) are atmospheric deposition and sediment supply from the continental margin and their relative importance in governing SO carbon export remains a subject of great debate. Here we report the results of simulations conducted with an ocean general circulation and biogeochemistry model (OGCBM) to quantify the importance of each source at different spatial scales at quasi-equilibrium. Overall, we find sediment derived iron is more important than dust derived iron in sustaining SO export production (by 1.4 to 9 times). Although dust iron is important in certain geographic sectors of the SO, this largely depends on the dust model employed. Apparent geographical correlations between dust deposition and export production can be misleading, since sediment iron can be transported to similar regions. Future generation OGCBMs must better represent spatial variability in deposition fluxes and iron solubility from dust, as well as the poorly constrained, yet regionally important, sediment source. Citation: Tagliabue, A., L. Bopp, and O. Aumont (2009), Evaluating the importance of atmospheric and sedimentary iron sources to Southern Ocean biogeochemistry, Geophys. Res. Lett., 36, L13601, doi: 10.1029/2009GL038914. specialized 032 064 36 L13601 2009 0094-8276 https://www.documentation.ird.fr/hor/PAR00003862 10.1029/2009gl038914 0094-8276 https://www.documentation.ird.fr/hor/PAR00003862 IRD - Base Horizon / Pleins textes 2009-07-24 2020-11-01 PAR00003862 fre