An early advance of glaciers on Mount Akdaǧ, SW Turkey, before the global Last Glacial Maximum; insights from cosmogenic nuclides and glacier modeling

Mehmet Akif Sarikaya*, Attila Çiner, Himmet Haybat, Marek Zreda

*Bu çalışma için yazışmadan sorumlu yazar

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80 Atıf (Scopus)

Özet

For the first time in Turkey, we report an early advance of glaciers before the broadly defined global Last Glacial Maximum (LGM). Forty-one moraine boulders from three glacial valleys on Mount Akdaǧ (36.54°N, 29.57°E, 3016m), southwest coast of Turkey, were dated with cosmogenic 36Cl. Valleys on the north side of the mountain were filled with few km long glaciers that terminated at elevations of about 2000m above sea level (a.s.l). The pre-LGM glaciations reached their maximum positions (2150m a.s.l) by 35.1±2.5ka ago (1σ; ka=1000 calendar years). The glaciers readvanced during the global LGM and reached their farthest locations (2050m a.s.l) by around 21.7±1.2ka ago. Later, glaciers retreated and shortly stabilized during the Lateglacial at around 15.1±0.9ka ago. Using the glacier modeling and paleoclimate proxies from the Eastern Mediterranean, we estimated that if temperatures during the LGM were 8-11°C colder than modern, which is suggested by paleotemperature proxies from the region, precipitation was up to two times more than that of today. Previous estimates on southwest coast of Turkey indicate a similar precipitation value while central Turkey requires drier conditions, implying regional heterogeneity on LGM climates in Turkey.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)96-109
Sayfa sayısı14
DergiQuaternary Science Reviews
Hacim88
DOI'lar
Yayın durumuYayınlandı - 15 Mar 2014

Finansman

This work was supported by TÜBİTAK grant # 110Y300 . We are thankful to L. Benedetti at the CNRS-CEREGE, France for their help on AMS measurements. We also appreciate helpful and constructive comments by N. Akçar (University of Bern, Switzerland) and an anonymous reviewer.

FinansörlerFinansör numarası
TÜBİTAK110Y300

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