Late Quaternary climate and environmental reconstruction based on leaf wax analyses in the loess sequence of Möhlin, Switzerland

Wüthrich, Lorenz Andreas; Bliedtner, Marcel; Schäfer, Imke Kathrin; Zech, Jana; Shajari, Fatemeh; Gaar, Dorian; Preusser, Frank; Salazar Quintero, Gary Abdiel; Szidat, Sönke; Zech, Roland (2017). Late Quaternary climate and environmental reconstruction based on leaf wax analyses in the loess sequence of Möhlin, Switzerland. Eiszeitalter und Gegenwart E&G / E&G Quaternary science journal, 66(2), pp. 91-100. 10.5194/egqsj-66-91-2017

[img]
Preview
Text
Wüthrich_Leaf wax analysis for loess sequence of Möhlin (EGQSJ).pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (4MB) | Preview

We present the results of leaf wax analyses (long-chain n-alkanes) from the 6.8 m deep loess sequence of Möhlin, Switzerland, spanning the last  ∼  70 kyr. Leaf waxes are well preserved and occur in sufficient amounts only down to 0.4 m and below 1.8 m depth, so no paleoenvironmental reconstructions can be done for marine isotope stage (MIS) 2. Compound-specific δ2Hwax analyses yielded similar values for late MIS 3 compared to the uppermost samples, indicating that various effects (e.g., more negative values due to lower temperatures, more positive values due to an enriched moisture source) cancel each other out. A pronounced  ∼  30 ‰ shift towards more negative values probably reflects more humid conditions before  ∼  32 ka. Radiocarbon dating of the n-alkanes corroborates the stratigraphic integrity of leaf waxes and their potential for dating loess–paleosol sequences (LPS) back to  ∼  30 ka.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Paleo-Geoecology
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Departement of Chemistry and Biochemistry
08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography

UniBE Contributor:

Wüthrich, Lorenz Andreas; Bliedtner, Marcel; Schäfer, Imke Kathrin; Zech, Jana; Gaar, Dorian; Salazar Quintero, Gary Abdiel; Szidat, Sönke and Zech, Roland

Subjects:

500 Science > 540 Chemistry
500 Science > 550 Earth sciences & geology

ISSN:

0424-7116

Language:

English

Submitter:

Sönke Szidat

Date Deposited:

22 Dec 2017 11:08

Last Modified:

19 Feb 2018 11:53

Publisher DOI:

10.5194/egqsj-66-91-2017

BORIS DOI:

10.7892/boris.108326

URI:

https://boris.unibe.ch/id/eprint/108326

Actions (login required)

Edit item Edit item
Provide Feedback