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  Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt

Raiswell, R., Benning, L. G., Tranter, M., Tulaczyk, S. (2008): Bioavailable iron in the Southern Ocean: the significance of the iceberg conveyor belt. - Geochemical Transactions, 9, 7, 9.
https://doi.org/10.1186/1467-4866-9-7

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 Urheber:
Raiswell, R.1, Autor
Benning, Liane G.2, Autor              
Tranter, M.1, Autor
Tulaczyk, S.1, Autor
Affiliations:
1External Organizations, ou_persistent22              
20 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146023              

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Schlagwörter: electron nanodiffraction continental-margin marine sediment colloidal iron sea-ice phytoplankton ferrihydrite deposition goethite waters Geochemistry & Geophysics
 Zusammenfassung: Productivity in the Southern Oceans is iron-limited, and the supply of iron dissolved from aeolian dust is believed to be the main source from outside the marine reservoir. Glacial sediment sources of iron have rarely been considered, as the iron has been assumed to be inert and non-bioavailable. This study demonstrates the presence of potentially bioavailable Fe as ferrihydrite and goethite in nanoparticulate clusters, in sediments collected from icebergs in the Southern Ocean and glaciers on the Antarctic landmass. Nanoparticles in ice can be transported by icebergs away from coastal regions in the Southern Ocean, enabling melting to release bioavailable Fe to the open ocean. The abundance of nanoparticulate iron has been measured by an ascorbate extraction. This data indicates that the fluxes of bioavailable iron supplied to the Southern Ocean from aeolian dust (0.01-0.13 Tg yr(-1)) and icebergs (0.06-0.12 Tg yr(-1)) are comparable. Increases in iceberg production thus have the capacity to increase productivity and this newly identified negative feedback may help to mitigate fossil fuel emissions.

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Sprache(n): eng - Englisch
 Datum: 2008
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: Anderer: WOS:000257561700001
DOI: 10.1186/1467-4866-9-7
ISSN: 1467-4866
URI: ://WOS:000257561700001
 Art des Abschluß: -

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Titel: Geochemical Transactions
Genre der Quelle: Zeitschrift, SCI, Scopus
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 9 (7) Artikelnummer: - Start- / Endseite: 9 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/1501131