Iron (Fe) concentrations and fluxes in TALDICE ice core 0.6 to 314 ky BP

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....

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Bibliographic Details
Main Authors: Vallelonga, Paul T, Barbante, Carlo, Cozzi, Giulio, Gabrieli, Jacopo, Schüpbach, Simon, Spolaor, Andrea, Turetta, Clara
Format: Dataset
Language:English
Published: PANGAEA 2013
Subjects:
Accumulation of snow/ice per year
AGE
Antarctica
Calcium
flux
DEPTH
ice/snow
Electromechanical drill
EMD
Iron
Number
TALDICE
Talos Dome
Talos Dome Ice Core
Antarc*
Antarctic
ice core
Ice Shelf
Ross Sea
Sea ice
Southern Ocean
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.808940
https://doi.org/10.1594/PANGAEA.808940
Description
Summary: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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