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Iron Fluxes to Talos Dome, Antarctica, Over the Past 200 Kyr : Volume 8, Issue 6 (05/12/2012)

By Vallelonga, P.

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Book Id: WPLBN0003974810
Format Type: PDF Article :
File Size: Pages 18
Reproduction Date: 2015

Title: Iron Fluxes to Talos Dome, Antarctica, Over the Past 200 Kyr : Volume 8, Issue 6 (05/12/2012)  
Author: Vallelonga, P.
Volume: Vol. 8, Issue 6
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Spolaor, A., Barbante, C., Vallelonga, P., Cozzi, G., Turetta, C., Schüpbach, S., & Gabrieli, J. (2012). Iron Fluxes to Talos Dome, Antarctica, Over the Past 200 Kyr : Volume 8, Issue 6 (05/12/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, Denmark. 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 reorganization 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 conclude that the maximum contribution of aeolian dust deposition to Southern Ocean sequestration of atmospheric CO2 is approximately 20 ppmv.

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

Excerpt
Albani, S., Delmonte, B., Maggi, V., Baroni, C., Petit, J.-R., Stenni, B., Mazzola, C., and Frezzotti, M.: Interpreting last glacial to Holocene dust changes at Talos Dome (East Antarctica): implications for atmospheric variations from regional to hemispheric scales, Clim. Past, 8, 741–750, doi:10.5194/cp-8-741-2012, 2012.; Anderson, R. F., Ali, S., Bradtmiller, L. I., Nielsen, S. H. H., Fleisher, M. Q., Anderson, B. E., and Burckle, L. H.: Wind-driven upwelling in the Southern Ocean and the deglacial rise in atmospheric CO2, Science, 323, 1443–1448, doi:10.1126/science.1167441, 2009.; Barbante, C., Cozzi, G., Capodaglio, G., Van de Velde, K., Ferrari, C. P., Boutron, C. F., and Cescon, P.: Trace element determination in alpine snow and ice by double focusing inductively coupled plasma mass spectrometry with microconcentric nebulization, J. Anal. Atom. Spectrom., 14, 1433–1438, doi:10.1039/A901949I, 1999.; Bory, A., Wolff, E., Mulvaney, R., Jagoutz, E., Wegner, A., Ruth, U., and Elderfield, H.: Multiple sources supply eolian mineral dust to the Atlantic sector of coastal Antarctica: evidence from recent snow layers at the top of Berkner Island ice sheet, Earth Planet. Sc. Lett., 291, 138–148, doi:10.1016/j.epsl.2010.01.006, 2010.; Buiron, D., Chappellaz, J., Stenni, B., Frezzotti, M., Baumgartner, M., Capron, E., Landais, A., Lemieux-Dudon, B., Masson-Delmotte, V., Montagnat, M., Parrenin, F., and Schilt, A.: TALDICE-1 age scale of the Talos Dome deep ice core, East Antarctica, Clim. Past, 7, 1–16, doi:10.5194/cp-7-1-2011, 2011.; Buiron, D., Stenni, B., Chappellaz, J., Landais, A., Baumgartner, M., Bonazza, M., Capron, E., Frezzotti, M., Kageyama, M., Lemieux-Dudon, B., Masson-Delmotte, V., Parrenin, F., Schilt, A., Selmo, E., Severi, M., Swingedouw, D., and Udisti, R.: Regional imprints of millennial variability during the MIS 3 period around Antarctica, Quaternary Sci. Rev., 48, 99–112, doi:10.1016/j.quascirev.2012.05.023, 2012.; Delmonte, B., Petit, J. R., Andersen, K. K., Basile-Doelsch, I., Maggi, V., and Ya Lipenkov, V.: Dust size evidence for opposite regional atmospheric circulation changes over East Antarctica during the last climatic transition, Clim. Dynam., 23, 427–438, doi:10.1007/s00382-004-0450-9, 2004.; Delmonte, B., Baroni, C., Andersson, P. S., Schoberg, H., Hansson, M., Aciego, S., Petit, J. R., Albani, S., Mazzola, C., Maggi, V., and Frezzotti, M.: Aeolian dust in the Talos Dome ice core (East Antarctica, Pacific/Ross Sea sector): Victoria Land versus remote sources over the last two climate cycles, J. Quaternary Sci., 25, 1327–1337, doi:10.1002/jqs.1418, 2010.; Edwards, R., Sedwick,&

 

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