Iron fluxes to Talos Dome, Antarctica, over the past 200 kyr

• Published in: Climate of the Past
• Main Authors: P. Vallelonga, G. Cozzi, J. Gabrieli, S. Schuepbach, Spolaor, Andrea, C. Turetta, BARBANTE, Carlo
• Other Authors: P., Vallelonga, Barbante, Carlo, G., Cozzi, J., Gabrieli, S., Schuepbach, C., Turetta
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2013
• Subjects: Antarctic; Ross Sea; Southern Ocean; Talos Dome; Antarc*; Antarctica; ice core; Ice Shelf; Sea ice
• Online Access: http://hdl.handle.net/10278/39091; https://doi.org/10.5194/cp-9-597-2013; http://www.clim-past.net/9/issue2.html

Atmospheric fluxes of iron (Fe) over the past 200kyr 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 in- terglacial 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 depo- sition to Southern Ocean sequestration of atmospheric CO2 is approximately 20 ppmv.