Clim. Past Discuss., 7, 601-633, 2011
www.clim-past-discuss.net/7/601/2011/
doi:10.5194/cpd-7-601-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Climate of the Past (CP). Please refer to the corresponding final paper in CP.
Rare Earth Elements from an ice core in the Atlantic sector of Antarctica indicate a dust provenance change at the end of the last deglaciation
A. Wegner1, P. Gabrielli2,3, D. Wilhelms-Dick1,*, U. Ruth4, M. Kriews1, P. De Deckker5, C. Barbante2,6, G. Cozzi2,6, B. Delmonte7, and H. Fischer1,8,9
1Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany
2Institute for the Dynamics of Environmental Processes, CNR, 30123 Venice, Italy
3School of Earth Science and Byrd Polar Research Center, The Ohio State University, Columbus, OH 43210-1002, USA
4Climate Analysis and Consulting, Pfullingen, Germany
5Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia
6Department of Environmental Sciences, University Ca' Foscari of Venice, Dorsoduro 2137, 30123 Venice, Italy
7DISAT – Department Environmental Sciences, University Milano Bicocca, 20126, Milan, Italy
8Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
9Oeschger Institute for Climate Change Research, University of Bern, Bern, Switzerland
*now at: University of Bremen, Klagenfurter Straße, Bremen, Germany

Abstract. We present a Rare Earth Elements (REE) record at decadal resolution determined in the EPICA ice core drilled in Dronning Maud Land (EDML) in the Atlantic Sector of the East Antarctic Plateau, covering the transition from the last glacial age (LGA) to the early Holocene (26 600–7500 yr BP). Additionally, samples from potential source areas (PSAs) for Antarctic dust were analysed for their REE characteristics. The dust provenance is discussed by comparing the REE fingerprints in the ice core and the PSAs samples. We find a shift in REE composition at 15 200 yr BP in the ice core samples. Before 15 200 yr BP, the dust composition is very uniform and its provenance was likely to be dominated by a South American source. After 15 200 yr BP, multiple sources such as Australia and New Zealand become relatively more important, albeit South America is possibly still an important dust supplier. A similar change in the dust characteristics was observed in the EPICA Dome C ice core at around ~15 000 yr BP. A return to more glacial dust characteristics between ~8300 and ~7500 yr BP, as observed in the EPICA Dome C core, could not be observed in the EDML core. Consequently, the dust provenance at the two sites must have been different at that time.

Citation: Wegner, A., Gabrielli, P., Wilhelms-Dick, D., Ruth, U., Kriews, M., De Deckker, P., Barbante, C., Cozzi, G., Delmonte, B., and Fischer, H.: Rare Earth Elements from an ice core in the Atlantic sector of Antarctica indicate a dust provenance change at the end of the last deglaciation, Clim. Past Discuss., 7, 601-633, doi:10.5194/cpd-7-601-2011, 2011.
 
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