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| Titel |
Iron fluxes to Talos Dome, Antarctica, over the past 200 kyr |
| VerfasserIn |
P. Vallelonga, C. Barbante, G. Cozzi, J. Gabrieli, S. Schüpbach, A. Spolaor, C. Turetta |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 2 ; Nr. 9, no. 2 (2013-03-08), S.597-604 |
| Datensatznummer |
250018008
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| Publikation (Nr.) |
 copernicus.org/cp-9-597-2013.pdf |
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| Zusammenfassung |
| Atmospheric fluxes of iron (Fe) over the past 200 kyr are reported for the
coastal Antarctic Talos Dome ice core, based on acid leachable Fe
concentrations. Fluxes of Fe to Talos Dome were consistently greater than
those at Dome C, with the greatest difference observed during interglacial
climates. We observe different Fe flux trends at Dome C and Talos Dome
during the deglaciation and early Holocene, attributed to a combination of
deglacial activation of dust sources local to Talos Dome and the reorganisation
of atmospheric transport pathways with the retreat of the Ross Sea ice
shelf. This supports similar findings based on dust particle sizes and
fluxes and Rare Earth Element fluxes. We show that Ca and Fe should not be
used as quantitative proxies for mineral dust, as they all demonstrate
different deglacial trends at Talos Dome and Dome C. Considering that a 20 ppmv
decrease in atmospheric CO2 at the coldest part of the last
glacial maximum occurs contemporaneously with the period of greatest Fe and
dust flux to Antarctica, we confirm that the maximum contribution of aeolian
dust deposition to Southern Ocean sequestration of atmospheric CO2 is
approximately 20 ppmv. |
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