Prochnow, Maximilian; Strobel, Paul; Bliedtner, Marcel; Struck, Julian; Bittner, Lucas; Szidat, Sönke; Salazar Quintero, Gary Abdiel; Schneider, Heike; Acharya, Sudip; Zech, Michael; Zech, Roland (2023). Summer paleohydrology during the Late Glacial and Early Holocene based on δ2H and δ18O from Bichlersee, Bavaria. Scientific Reports, 13(1), p. 18487. Nature Publishing Group 10.1038/s41598-023-45754-4
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Isotope-based records provide valuable information on past climate changes. However, it is not always trivial to disentangle past changes in the isotopic composition of precipitation from possible changes in evaporative enrichment, and seasonality may need to be considered. Here, we analyzed δ2H on n-alkanes and δ18O on hemicellulose sugars in sediments from Bichlersee, Bavaria, covering the Late Glacial and Early Holocene. Our δ2Hn-C31 record documents past changes in the isotopic composition of summer precipitation and roughly shows the isotope pattern known from Greenland. Both records show lower values during the Younger Dryas, but at Bichlersee the signal is less pronounced, corroborating earlier suggestions that the Younger Dryas was mainly a winter phenomenon and less extreme during summer. δ18Ofucose records the isotopic composition of the lake water during summer and is sensitive to evaporative enrichment. Coupling δ2Hn-C31 and δ18Ofucose allows calculating lake water deuterium-excess and thus disentangling changes in the isotopic composition of precipitation and evaporative enrichment. Our deuterium-excess record reveals that the warm Bølling-Allerød and Early Holocene were characterized by more evaporative enrichment compared to the colder Younger Dryas. Site-specific hydrological conditions, seasonality, and coupling δ2H and δ18O are thus important when interpreting isotope records.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR) 08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Szidat, Sönke, Salazar Quintero, Gary Abdiel |
Subjects: |
500 Science > 540 Chemistry |
ISSN: |
2045-2322 |
Publisher: |
Nature Publishing Group |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
30 Oct 2023 09:55 |
Last Modified: |
27 Nov 2023 05:44 |
Publisher DOI: |
10.1038/s41598-023-45754-4 |
PubMed ID: |
37898674 |
BORIS DOI: |
10.48350/188283 |
URI: |
https://boris.unibe.ch/id/eprint/188283 |
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