<sup>18</sup>O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study
<p>The analysis of the stable oxygen isotopes <span class="inline-formula"><sup>18</sup>O</span> and <span class="inline-formula"><sup>16</sup>O</span> has revolutionized paleoclimate research since the middle of the last cent...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | deu |
| Published: |
Copernicus Publications
2022-04-01
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| Series: | Eiszeitalter und Gegenwart |
| Online Access: | https://egqsj.copernicus.org/articles/71/83/2022/egqsj-71-83-2022.pdf |
| _version_ | 1818050711853727744 |
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| author | J. Labahn L. Bittner P. Hirschmann C.-B. Roettig D. Burghardt B. Glaser S. B. Marković M. Zech |
| author_facet | J. Labahn L. Bittner P. Hirschmann C.-B. Roettig D. Burghardt B. Glaser S. B. Marković M. Zech |
| author_sort | J. Labahn |
| collection | DOAJ |
| description | <p>The analysis of the stable oxygen isotopes <span class="inline-formula"><sup>18</sup>O</span> and
<span class="inline-formula"><sup>16</sup>O</span> has revolutionized paleoclimate research since the middle of the
last century. Particularly, <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> of ice cores from Greenland
and Antarctica is used as a paleotemperature proxy, and <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> of deep-sea
sediments is used as a proxy for global ice volume. Important terrestrial
archives to which <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> as a paleoclimate proxy is successfully
applied are speleothems, lake sediments, or tree rings. By contrast, <span class="inline-formula"><i>δ</i><sup>18</sup></span>O applications to loess–paleosol sequences (LPSs) are scarce. Here
we present a first continuous <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> record (<span class="inline-formula"><i>n</i>=50</span>) 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 <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> analyses of plant-derived lipids. The Crvenka <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>bulk lipid</sub></span> values range between <span class="inline-formula">−10.2</span> ‰
and <span class="inline-formula">+23.0</span> ‰ 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 <span class="inline-formula"><i>δ</i><sup>18</sup>O</span><span class="inline-formula"><sub>bulk lipid</sub></span> record provides no
evidence for the occurrence of interstadials and stadials comparable to the
Dansgaard–Oeschger events known from the Greenland <span class="inline-formula"><i>δ</i><sup>18</sup>O</span><span class="inline-formula"><sub>ice core</sub></span> records. Concerning the interpretation of our Crvenka <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>bulk lipid</sub></span> record, plant-derived lipids such as fatty acids
and alcohols are certainly strongly influenced by climatic factors such as
temperature (via <span class="inline-formula"><i>δ</i><sup>18</sup>O</span><span class="inline-formula"><sub>precipitation</sub>)</span> and relative air
humidity (via <span class="inline-formula"><sup>18</sup>O</span> 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 <span class="inline-formula"><i>δ</i><sup>18</sup>O</span><span class="inline-formula"><sub>bulk lipid</sub></span> analyses from LPSs.</p> |
| first_indexed | 2024-12-10T10:57:49Z |
| format | Article |
| id | doaj.art-83f7425146b9495d81a8408d9084b9ed |
| institution | Directory Open Access Journal |
| issn | 0424-7116 2199-9090 |
| language | deu |
| last_indexed | 2024-12-10T10:57:49Z |
| publishDate | 2022-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Eiszeitalter und Gegenwart |
| spelling | doaj.art-83f7425146b9495d81a8408d9084b9ed2022-12-22T01:51:47ZdeuCopernicus PublicationsEiszeitalter und Gegenwart0424-71162199-90902022-04-0171839010.5194/egqsj-71-83-2022<sup>18</sup>O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot studyJ. Labahn0L. Bittner1P. Hirschmann2C.-B. Roettig3D. Burghardt4B. Glaser5S. B. Marković6M. Zech7Heisenberg Chair of Physical Geography with Focus on Paleoenvironmental Research, Technische Universität Dresden, Helmholtzstraße 10, 01069 Dresden, GermanyHeisenberg Chair of Physical Geography with Focus on Paleoenvironmental Research, Technische Universität Dresden, Helmholtzstraße 10, 01069 Dresden, GermanyHeisenberg Chair of Physical Geography with Focus on Paleoenvironmental Research, Technische Universität Dresden, Helmholtzstraße 10, 01069 Dresden, GermanyHeisenberg Chair of Physical Geography with Focus on Paleoenvironmental Research, Technische Universität Dresden, Helmholtzstraße 10, 01069 Dresden, GermanyInstitute of Groundwater Management, Department of Hydro Sciences, Technische Universität Dresden, Bergstraße 66, 01069 Dresden, GermanySoil Biogeochemistry, Institute of Agronomy and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Von-Seckendorff-Platz 3, 06120 Halle (Saale), GermanyChair of Physical Geography, Faculty of Sciences, University of Novi Sad, Trg D. Obradovića 3, 21000 Novi Sad, SerbiaHeisenberg Chair of Physical Geography with Focus on Paleoenvironmental Research, Technische Universität Dresden, Helmholtzstraße 10, 01069 Dresden, Germany<p>The analysis of the stable oxygen isotopes <span class="inline-formula"><sup>18</sup>O</span> and <span class="inline-formula"><sup>16</sup>O</span> has revolutionized paleoclimate research since the middle of the last century. Particularly, <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> of ice cores from Greenland and Antarctica is used as a paleotemperature proxy, and <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> of deep-sea sediments is used as a proxy for global ice volume. Important terrestrial archives to which <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> as a paleoclimate proxy is successfully applied are speleothems, lake sediments, or tree rings. By contrast, <span class="inline-formula"><i>δ</i><sup>18</sup></span>O applications to loess–paleosol sequences (LPSs) are scarce. Here we present a first continuous <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> record (<span class="inline-formula"><i>n</i>=50</span>) 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 <span class="inline-formula"><i>δ</i><sup>18</sup>O</span> analyses of plant-derived lipids. The Crvenka <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>bulk lipid</sub></span> values range between <span class="inline-formula">−10.2</span> ‰ and <span class="inline-formula">+23.0</span> ‰ 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 <span class="inline-formula"><i>δ</i><sup>18</sup>O</span><span class="inline-formula"><sub>bulk lipid</sub></span> record provides no evidence for the occurrence of interstadials and stadials comparable to the Dansgaard–Oeschger events known from the Greenland <span class="inline-formula"><i>δ</i><sup>18</sup>O</span><span class="inline-formula"><sub>ice core</sub></span> records. Concerning the interpretation of our Crvenka <span class="inline-formula"><i>δ</i><sup>18</sup></span>O<span class="inline-formula"><sub>bulk lipid</sub></span> record, plant-derived lipids such as fatty acids and alcohols are certainly strongly influenced by climatic factors such as temperature (via <span class="inline-formula"><i>δ</i><sup>18</sup>O</span><span class="inline-formula"><sub>precipitation</sub>)</span> and relative air humidity (via <span class="inline-formula"><sup>18</sup>O</span> 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 <span class="inline-formula"><i>δ</i><sup>18</sup>O</span><span class="inline-formula"><sub>bulk lipid</sub></span> analyses from LPSs.</p>https://egqsj.copernicus.org/articles/71/83/2022/egqsj-71-83-2022.pdf |
| spellingShingle | J. Labahn L. Bittner P. Hirschmann C.-B. Roettig D. Burghardt B. Glaser S. B. Marković M. Zech <sup>18</sup>O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study Eiszeitalter und Gegenwart |
| title | <sup>18</sup>O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
| title_full | <sup>18</sup>O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
| title_fullStr | <sup>18</sup>O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
| title_full_unstemmed | <sup>18</sup>O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
| title_short | <sup>18</sup>O analyses of bulk lipids as novel paleoclimate tool in loess research – a pilot study |
| title_sort | sup 18 sup o analyses of bulk lipids as novel paleoclimate tool in loess research a pilot study |
| url | https://egqsj.copernicus.org/articles/71/83/2022/egqsj-71-83-2022.pdf |
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