Please use this identifier to cite or link to this item: https://hdl.handle.net/11499/37267
Title: Multi-proxy speleothem record of climate instability during the early last interglacial in southern Turkey
Authors: Rowe, P.J.
Wickens, L.B.
Sahy, D.
Marca, A.D.
Peckover, E.
Noble, S.
Özkul, Mehmet
Keywords: Aragonite
Climate anomaly
Mediterranean
Stable isotopes
Stalagmite
Termination II
anomaly
aragonite
dissolution
glacial-interglacial cycle
groundwater flow
Holocene
Last Interglacial
proxy climate record
speleothem
stable isotope
stalagmite
Alps
Atlantic Ocean
Atlantic Ocean (North)
France
Greece
Italy
Turkey
Publisher: Elsevier B.V.
Abstract: A stalagmite from Dim Cave in southern Turkey contains a climate record documenting rapid and significant changes in amounts of precipitation between ~132 ka and ~128 ka, during the penultimate glacial – interglacial transition. Some U–Th dates have been compromised by carbonate dissolution but rigorous selection and tuning to ?18O records from other speleothems has generated a robust age model. Growth rate was initially very slow but a rapid increase at ~129 ka was accompanied by strong negative trends in ?18O and ?13C, a combination implying the onset of much wetter conditions. Isotopic values at ~129 ka suggest that groundwater recharge rates and biogenic activity in the soil zone exceeded those of the early Holocene. A significant isotopic enrichment event at ~128 ka, during which there was alternating aragonite and calcite deposition, documents a strong drying event with a duration of ~200 years. A concurrent decrease in 87Sr/86Sr ratios indicates increased groundwater residence times and the cumulative evidence suggests amounts of rainfall fell from well above to slightly below present-day levels. Similar ?18O enrichment events are present in coeval speleothem records from southwest France and the Northern Alps, and these, together with pollen evidence from Italy, Greece and the Iberian margin of drier conditions at this time, imply that a climate anomaly extended across the northern Mediterranean borderlands. The timing, duration and structure of this episode are consistent with marine evidence of strong North Atlantic cooling early in the last interglacial and there is a resemblance to the Holocene 8.2 ka event recorded globally in many proxy-climate archives. © 2019
URI: https://hdl.handle.net/11499/37267
https://doi.org/10.1016/j.palaeo.2019.109422
ISSN: 0031-0182
Appears in Collections:Mühendislik Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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