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

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)96-109
Number of pages14
JournalQuaternary Science Reviews
Volume88
DOIs
StatePublished - Mar 15 2014

Keywords

  • Chlorine-36
  • Cosmogenic surface dating
  • Glacier
  • Last Glacial Maximum
  • Lateglacial
  • Moraine
  • Mount Akdaǧ
  • Paleoclimate
  • Pre-LGM
  • Turkey

ASJC Scopus subject areas

  • Global and Planetary Change
  • Ecology, Evolution, Behavior and Systematics
  • Archaeology
  • Archaeology
  • Geology

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