Publications des scientifiques de l'IRD

Tagliabue A., Bopp L., Aumont Olivier. (2009). Evaluating the importance of atmospheric and sedimentary iron sources to Southern Ocean biogeochemistry. Geophysical Research Letters, 36, L13601. ISSN 0094-8276.

Titre du document
Evaluating the importance of atmospheric and sedimentary iron sources to Southern Ocean biogeochemistry
Année de publication
2009
Type de document
Article référencé dans le Web of Science WOS:000267639800003
Auteurs
Tagliabue A., Bopp L., Aumont Olivier
Source
Geophysical Research Letters, 2009, 36, L13601 ISSN 0094-8276
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.
Plan de classement
Limnologie physique / Océanographie physique [032] ; Géologie et formations superficielles [064]
Identifiant IRD
PAR00003862
Contact