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| Titel |
North Atlantic abrupt climatic events of the last glacial period recorded in Ukrainian loess deposits |
| VerfasserIn |
D.-D. Rousseau, P. Antoine, N. Gerasimenko, A. Sima, M. Fuchs, C. Hatté, O. Moine, L. Zoeller |
| 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 ; 7, no. 1 ; Nr. 7, no. 1 (2011-03-08), S.221-234 |
| Datensatznummer |
250004407
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| Publikation (Nr.) |
 copernicus.org/cp-7-221-2011.pdf |
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| Zusammenfassung |
| Loess deposits are widely distributed in the Northern Hemisphere, where they
have recorded not only the glacial-interglacial cycles, but also
millennial-timescale changes resembling those in marine and ice cores. Such
abrupt variations are clearly marked in western European series, but have
not yet been evidenced in the East of the continent. Here we present results
of the high-resolution investigation of a Weichselian Upper Pleniglacial
loess sequence (~38–15 ka) from Stayky, Ukraine. The stratigraphy
shows an alternation of loess horizons and embryonic soils, similar to
sequences from western Europe. Similarities are also found between
variations of a grain-size index (ratio between coarse and fine material
fractions) in Stayky and in western European profiles. Based on these
similarities and in agreement with the luminescence dates, the embryonic
soils are associated with the Greenland interstadials (GIS) 7 to 2, and the
Vytachiv paleosol at the base of the sequence, with GIS 8. Pollen analysis
indicates a wetter climate for these interstadials, allowing the development
of arboreal vegetation, than for the stadials, which are marked by loess formation.
The grain-size index reaches the highest values for intervals correlated
with the Heinrich events 3 and 2. Thus, it appears that the North Atlantic
abrupt climate changes have extended their influence and modulated the loess
sedimentation at least as far as eastern Europe. This result is supported
by recent climate modeling experiments and recommends the Stayky sequence
as a reference for further comparisons between profiles along the Eurasian
loess belt centered at 50° N. |
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