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 language | English (US) |
|---|---|
| Pages (from-to) | 96-109 |
| Number of pages | 14 |
| Journal | Quaternary Science Reviews |
| Volume | 88 |
| DOIs | |
| State | Published - Mar 15 2014 |
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Keywords
- Chlorine-36
- Cosmogenic surface dating
- Glacier
- Last Glacial Maximum
- Lateglacial
- Moraine
- Mount Akdaǧ
- Paleoclimate
- Pre-LGM
- Turkey
ASJC Scopus subject areas
- Geology
- Global and Planetary Change
- Ecology, Evolution, Behavior and Systematics
- Archaeology
- Archaeology
Cite this
An early advance of glaciers on Mount Akdaǧ, SW Turkey, before the global Last Glacial Maximum; insights from cosmogenic nuclides and glacier modeling. / Sarikaya, Mehmet Akif; Çiner, Attila; Haybat, Himmet; Zreda, Marek G.
In: Quaternary Science Reviews, Vol. 88, 15.03.2014, p. 96-109.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - An early advance of glaciers on Mount Akdaǧ, SW Turkey, before the global Last Glacial Maximum; insights from cosmogenic nuclides and glacier modeling
AU - Sarikaya, Mehmet Akif
AU - Çiner, Attila
AU - Haybat, Himmet
AU - Zreda, Marek G
PY - 2014/3/15
Y1 - 2014/3/15
N2 - 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.
AB - 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.
KW - Chlorine-36
KW - Cosmogenic surface dating
KW - Glacier
KW - Last Glacial Maximum
KW - Lateglacial
KW - Moraine
KW - Mount Akdaǧ
KW - Paleoclimate
KW - Pre-LGM
KW - Turkey
UR - http://www.scopus.com/inward/record.url?scp=84897584372&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84897584372&partnerID=8YFLogxK
U2 - 10.1016/j.quascirev.2014.01.016
DO - 10.1016/j.quascirev.2014.01.016
M3 - Article
VL - 88
SP - 96
EP - 109
JO - Quaternary Science Reviews
JF - Quaternary Science Reviews
SN - 0277-3791
ER -