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| Titel |
Change in dust variability in the Atlantic sector of Antarctica at the end of the last deglaciation |
| VerfasserIn |
A. Wegner, P. Gabrielli, D. Wilhelms-Dick, U. Ruth, M. Kriews, P. Deckker, C. Barbante, G. Cozzi, B. Delmonte, H. Fischer |
| 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 ; 8, no. 1 ; Nr. 8, no. 1 (2012-01-19), S.135-147 |
| Datensatznummer |
250005365
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| Publikation (Nr.) |
 copernicus.org/cp-8-135-2012.pdf |
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| Zusammenfassung |
| We present a Rare Earth Elements (REE) record determined on the EPICA ice
core drilled at Dronning Maud Land (EDML) in the Atlantic sector of the East
Antarctic Plateau. The record covers the transition from the last glacial
stage (LGS) to the early Holocene (26 600–7500 yr BP) at decadal to
centennial resolution. Additionally, samples from potential source areas
(PSAs) for Antarctic dust were analyzed for their REE characteristics. The
dust provenance is discussed by comparing the REE fingerprints in the ice
core and the PSA samples. We find a shift in variability in REE composition
at ~15 000 yr BP in the ice core samples. Before 15 000 yr BP, the
dust composition is very uniform and its provenance was most certainly
dominated by a South American source. After 15 000 yr BP, multiple sources
such as Australia and New Zealand become relatively more important, although
South America remains the major dust source. A similar change in the dust
characteristics was observed in the EPICA Dome C ice core at around
~15 000 yr BP, accompanied by a shift in the REE composition, thus
suggesting a change of atmospheric circulation in the Southern Hemisphere. |
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