A global compilation of over 13 000 dissolved iron measurements : focus on distributions and processes in the Southern Ocean

dc.contributor.authorTagliabue, A.
dc.contributor.authorMtshali, T.
dc.contributor.authorAumont, O.
dc.contributor.authorBowie, A. R.
dc.contributor.authorKlunder, M. B.
dc.contributor.authorRoychoudhury, A. N.
dc.contributor.authorSwart, S.
dc.date.accessioned2012-04-25T14:45:45Z
dc.date.available2012-04-25T14:45:45Z
dc.date.issued2011-11
dc.descriptionPublication of this article was funded by the Stellenbosch University Open Access Fund.en_ZA
dc.descriptionThe original publication is available at http://www.biogeosciences-discuss.net/
dc.description.abstractDue to its importance as a limiting nutrient for phytoplankton growth in large regions of the world’s oceans, ocean water column observations of concentration of the tracemetal iron (Fe) have increased markedly over recent decades. Here we compile > 13 000 global measurements of dissolved Fe (dFe) and make this available to the community. We then conduct a synthesis study focussed on the Southern Ocean, where dFe plays a fundamental role in governing the carbon cycle, using four regions, six basins and five depth intervals as a framework. Our analysis reveals the importance of biological activity and dFe inputs in governing the inter-region and inter-basin differences in surface dFe, respectively. In deep waters, the major controls of interregion and inter-basin dFe variability are ligand distributions and deep dFe inputs or water mass characteristics, respectively. We find that even in regions where many dFe measurements exist, the processes governing the seasonal evolution of dFe remain enigmatic, suggesting that, aside from broad sub-Antarctic–Antarctic trends, biological activity might not the major driver of dFe variability. Nevertheless, missing measurements during key seasonal transitions make it difficult to better quantify and understand surface water replenishment processes and the seasonal Fe cycle. Statistical differences exist in the measured dFe between measurements taken over the period 1989–2002 and 2003–2008, which may reflect progress in clean sampling and analysis techniques. Finally, we detail the degree of seasonal coverage by region, basin and depth. By synthesising prior measurements we suggest a role for different processes and highlight key gaps in understanding, which we hope can help structure future research efforts in the Southern Ocean.en_ZA
dc.description.sponsorshipStellenbosch University Open Access Funden_ZA
dc.description.versionPublishers' Versionen_ZA
dc.format.extentp. 11489-11527 : ill. (some col.)en_ZA
dc.identifier.citationTagliabue, A. et al. 2011. A global compilation of over 13 000 dissolved iron measurements: focus on distributions and processes in the Southern Ocean. Biogeosciences Discussions, 8, 11489-11527, doi:doi:10.5194/bgd-8-11489-2011.en_ZA
dc.identifier.ismn1810-6285 (online)
dc.identifier.otherdoi:10.5194/bgd-8-11489-2011
dc.identifier.urihttp://hdl.handle.net/10019.1/20876
dc.publisherCopernicus Publications
dc.rights.holderAuthor retain the copyright
dc.subjectIron measurement -- Southern Oceanen_ZA
dc.subjectIron -- Research -- Southern Oceanen_ZA
dc.subjectIron -- Distributions and processesen_ZA
dc.titleA global compilation of over 13 000 dissolved iron measurements : focus on distributions and processes in the Southern Oceanen_ZA
dc.typeArticleen_ZA
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