Paleoenvironmental and paleoclimatic variations around Lake Van (Eastern Turkey) recorded by sedimentary source specific biomarkers 250–130 ka (MIS7 and MIS6)

Typhaine Guillemont, Monika Stockhecke, Achim Bechtel, S.N. Ladd, D.B. Nelson, Carsten J Schubert

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

2 Zitate (Scopus)

Abstract

Paleoclimatic changes during MIS7 and MIS6 remain poorly described in the Near East. We quantified source-specific biomarkers in Lake Van sediments during the interglacial/glacial cycle MIS7/MIS6. Long-chain n-alkanes produced by land-derived vegetation, as well as long-chain alkenones and sterols (namely brassicasterol and dinosterol) produced by aquatic algae were investigated. Stable hydrogen isotopic measurements (δ 2H) on n-C 29 alkanes were used as a proxy for aridity and revealed three wetter periods interrupted by two drier intervals during MIS7. In contrast, during the MIS6 glaciation, a generally drier climate was predominant. During the warmer and wetter periods of MIS7, a higher input of aquatic organic matter to Lake Van sediments was recorded by higher concentrations of long-chain alkenones, dinosterol and brassicasterol. Long-chain alkane abundances do not show a pattern related to aridity and were observed in higher concentrations in wetter as well as drier periods. Generally, in the Eastern Mediterranean, a wetter interglacial interrupted by drier episodes followed by a dry glacial period was the common feature observed during the MIS7/MIS6 interglacial/glacial cycle. However, in comparison to the last interglacial/glacial cycle the extreme dry glacial period registered around Lake Van from MIS5d to MIS2 was apparently unique and not equaled by a similar event within the last 250 ka.

OriginalspracheEnglisch
Aufsatznummer105997
Seitenumfang10
FachzeitschriftQuaternary Science Reviews
Jahrgang225.2019
Ausgabenummer1 December
Frühes Online-Datum25 Okt. 2019
DOIs
PublikationsstatusVeröffentlicht - 1 Dez. 2019

Bibliographische Notiz

Funding Information:
The authors acknowledge funding from the Swiss National Science Foundation (SNF) 200021_124981 , 200020_143330 , P300P2-158501 200020_143340 , 20FI21_124972, 200021_124981 , and 200020L_156110/1 , the PALEOVAN drilling campaign by the International Continental Scientific Drilling Program (ICDP) , the Deutsche Forschungsgemeinschaft (DFG) LI 582/20-1 , the Scientific and Technological Research Council of Turkey (Tübitak) and the Austrian Science Foundation (FWF Project No. I 2068-N29 ).

Publisher Copyright:
© 2019 Elsevier Ltd

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