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| Titel |
Paleoclimate in north-east Anatolia during the Quaternary deduced from glacial archives |
| VerfasserIn |
R. Reber, N. Akçar, V. Yavuz, D. Tikhomirov, C. Vockenhuber, P. W. Kubik, C. Schlüchter |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250069380
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| Zusammenfassung |
| Today’s climate of the northern part of the eastern Black Sea Mountains is humid with a
mean annual precipitation over 2000 mm. The moisture is directly transported from the
Black Sea. Field evidence indicate that this area was glaciated during past. Ice
build-up can be therefore explained by a moisture transport system similar to today.
Analogous to the north, the southern part of these mountains is relatively dry, although
the field evidence in Çoruh Valley in Yusufeli, for instance, point to even more
extensive glaciations. To accumulate more ice volume in the southern part, a different
moisture transport than today is needed, for instance the moisture transport path
may have changed in the past. But the time when this ice-build up (recorded by
glacial deposits and erosional features) took place is still unclear. To construct the
chronology of these glaciations with cosmogenic 10Be and 36Cl, we collected 14
samples from erratic boulders and glacially abraded bedrock in the Çoruh Valley in
Yusufeli in the southern part and 41 samples in the Başyayla valley in the northern
part.
According to the existing data, glaciers advanced around 21 ka in the Kavron and
Verçenik valleys in the northern part during the Last Glacial Maximum (LGM)
(Akçar et al. 2007; 2008). While a Lateglacial advance archived around 15 ka in the
Verçenik valley, Younger Dryas is recorded around 12 ka in the Kavron valley. Our first
results from Çoruh valley indicate presence of two pre-LGM glaciations (>35 ka
and >70 ka), a LGM advance (not dated yet) and a Lateglacial extent around 14
ka.
Both field and dating evidence from the southern part of the eastern Black Sea Mountains
enriches our knowledge about the glacier build-up and moisture transport during the Late
Pleistocene, which can be interesting for our understanding of changes atmospheric
circulation patterns during colder periods.
References
Akçar, N., Yavuz, V., Ivy-Ochs, S., Kubik, P.W., Vardar, M., Schlüchter, C., 2008, A case
for a downwasting mountain glacier during Termination I, Verçenik Valley,northeastern
Turkey . Journal of Quaternary Science 23, 273-285.
Akçar, N., Yavuz, V., Ivy-Ochs, S., Kubik, P.W., Vardar, M. & Schlüchter, C., 2007,
Paleoglacial Records from Kavron Valley, NE Turey: Field and cosmogenic exposure dating
evidence. Quaternary International 1664-165, 170-183. |
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