18O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study
The analysis of the stable oxygen isotopes 18 O and 16 O has revolutionized paleoclimate research since the middle of the last century. Particularly, δ 18 O of ice cores from Greenland and Antarctica is used as a paleotemperature proxy, and δ 18 O of deep-sea sediments is used as a proxy for global...
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ftcopernicus:oai:publications.copernicus.org:egqsj98862 2023-05-15T14:02:18+02:00 18O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study Labahn, Jakob Bittner, Lucas Hirschmann, Philip Roettig, Christopher-Bastian Burghardt, Diana Glaser, Bruno Marković, Slobodan B. Zech, Michael 2022-04-13 application/pdf https://doi.org/10.5194/egqsj-71-83-2022 https://egqsj.copernicus.org/articles/71/83/2022/ eng eng doi:10.5194/egqsj-71-83-2022 https://egqsj.copernicus.org/articles/71/83/2022/ eISSN: 2199-9090 Text 2022 ftcopernicus https://doi.org/10.5194/egqsj-71-83-2022 2022-04-18T16:21:49Z The analysis of the stable oxygen isotopes 18 O and 16 O has revolutionized paleoclimate research since the middle of the last century. Particularly, δ 18 O of ice cores from Greenland and Antarctica is used as a paleotemperature proxy, and δ 18 O of deep-sea sediments is used as a proxy for global ice volume. Important terrestrial archives to which δ 18 O as a paleoclimate proxy is successfully applied are speleothems, lake sediments, or tree rings. By contrast, δ 18 O applications to loess–paleosol sequences (LPSs) are scarce. Here we present a first continuous δ 18 O record ( n =50 ) for the LPS Crvenka in Serbia, southeastern Europe, spanning the last glacial–interglacial cycle (since 145 ka). From a methodological point of view, we took advantage of a recently proposed paleoclimate/paleohydrological proxy based on bulk δ 18 O analyses of plant-derived lipids. The Crvenka δ 18 O bulk lipid values range between −10.2 ‰ and +23.0 ‰ and are systematically more positive in the interglacial and interstadial (paleo-)soils corresponding to marine oxygen-isotope stage (MIS) 1, 3, and 5, compared to the loess layers (MIS 2, 4, and 6). Our Crvenka δ 18 O bulk lipid record provides no evidence for the occurrence of interstadials and stadials comparable to the Dansgaard–Oeschger events known from the Greenland δ 18 O ice core records. Concerning the interpretation of our Crvenka δ 18 O bulk lipid record, plant-derived lipids such as fatty acids and alcohols are certainly strongly influenced by climatic factors such as temperature (via δ 18 O precipitation ) and relative air humidity (via 18 O enrichment of leaf water due to evapotranspiration). However, pool effects in the form of non-water-correlated lipids such as sterols or the input of root-derived lipids need to be considered, too. Similarly, the input of soil-microbial lipids and oxygen exchange reactions represent uncertainties challenging quantitative paleoclimate/paleohydrological reconstructions based on δ 18 O bulk lipid analyses from LPSs. Text Antarc* Antarctica Dansgaard-Oeschger events Greenland ice core Copernicus Publications: E-Journals Greenland E&G Quaternary Science Journal 71 1 83 90 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The analysis of the stable oxygen isotopes 18 O and 16 O has revolutionized paleoclimate research since the middle of the last century. Particularly, δ 18 O of ice cores from Greenland and Antarctica is used as a paleotemperature proxy, and δ 18 O of deep-sea sediments is used as a proxy for global ice volume. Important terrestrial archives to which δ 18 O as a paleoclimate proxy is successfully applied are speleothems, lake sediments, or tree rings. By contrast, δ 18 O applications to loess–paleosol sequences (LPSs) are scarce. Here we present a first continuous δ 18 O record ( n =50 ) for the LPS Crvenka in Serbia, southeastern Europe, spanning the last glacial–interglacial cycle (since 145 ka). From a methodological point of view, we took advantage of a recently proposed paleoclimate/paleohydrological proxy based on bulk δ 18 O analyses of plant-derived lipids. The Crvenka δ 18 O bulk lipid values range between −10.2 ‰ and +23.0 ‰ and are systematically more positive in the interglacial and interstadial (paleo-)soils corresponding to marine oxygen-isotope stage (MIS) 1, 3, and 5, compared to the loess layers (MIS 2, 4, and 6). Our Crvenka δ 18 O bulk lipid record provides no evidence for the occurrence of interstadials and stadials comparable to the Dansgaard–Oeschger events known from the Greenland δ 18 O ice core records. Concerning the interpretation of our Crvenka δ 18 O bulk lipid record, plant-derived lipids such as fatty acids and alcohols are certainly strongly influenced by climatic factors such as temperature (via δ 18 O precipitation ) and relative air humidity (via 18 O enrichment of leaf water due to evapotranspiration). However, pool effects in the form of non-water-correlated lipids such as sterols or the input of root-derived lipids need to be considered, too. Similarly, the input of soil-microbial lipids and oxygen exchange reactions represent uncertainties challenging quantitative paleoclimate/paleohydrological reconstructions based on δ 18 O bulk lipid analyses from LPSs. |
format |
Text |
author |
Labahn, Jakob Bittner, Lucas Hirschmann, Philip Roettig, Christopher-Bastian Burghardt, Diana Glaser, Bruno Marković, Slobodan B. Zech, Michael |
spellingShingle |
Labahn, Jakob Bittner, Lucas Hirschmann, Philip Roettig, Christopher-Bastian Burghardt, Diana Glaser, Bruno Marković, Slobodan B. Zech, Michael 18O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
author_facet |
Labahn, Jakob Bittner, Lucas Hirschmann, Philip Roettig, Christopher-Bastian Burghardt, Diana Glaser, Bruno Marković, Slobodan B. Zech, Michael |
author_sort |
Labahn, Jakob |
title |
18O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
title_short |
18O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
title_full |
18O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
title_fullStr |
18O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
title_full_unstemmed |
18O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
title_sort |
18o analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
publishDate |
2022 |
url |
https://doi.org/10.5194/egqsj-71-83-2022 https://egqsj.copernicus.org/articles/71/83/2022/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Dansgaard-Oeschger events Greenland ice core |
genre_facet |
Antarc* Antarctica Dansgaard-Oeschger events Greenland ice core |
op_source |
eISSN: 2199-9090 |
op_relation |
doi:10.5194/egqsj-71-83-2022 https://egqsj.copernicus.org/articles/71/83/2022/ |
op_doi |
https://doi.org/10.5194/egqsj-71-83-2022 |
container_title |
E&G Quaternary Science Journal |
container_volume |
71 |
container_issue |
1 |
container_start_page |
83 |
op_container_end_page |
90 |
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1766272495495675904 |