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• W2890621156 endingPage "733" @default.
• W2890621156 startingPage "713" @default.
• W2890621156 abstract "Abstract. Causes of the Late Glacial to Early Holocene transition phase and particularly the Younger Dryas period, i.e. the major last cold spell in central Europe during the Late Glacial, are considered to be keys for understanding rapid natural climate change in the past. The sediments from maar lakes in the Eifel, Germany, have turned out to be valuable archives for recording such paleoenvironmental changes. For this study, we investigated a Late Glacial to Early Holocene sediment core that was retrieved from the Gemündener Maar in the Western Eifel, Germany. We analysed the hydrogen (δ2H) and oxygen (δ18O) stable isotope composition of leaf-wax-derived lipid biomarkers (n-alkanes C27 and C29) and a hemicellulose-derived sugar biomarker (arabinose), respectively. Both δ2Hn-alkane and δ18Osugar are suggested to reflect mainly leaf water of vegetation growing in the catchment of the Gemündener Maar. Leaf water reflects δ2H and δ18O of precipitation (primarily temperature-dependent) modified by evapotranspirative enrichment of leaf water due to transpiration. Based on the notion that the evapotranspirative enrichment depends primarily on relative humidity (RH), we apply a previously introduced “coupled δ2Hn-alkane–δ18Osugar paleohygrometer approach” to reconstruct the deuterium excess of leaf water and in turn Late Glacial–Early Holocene RH changes from our Gemündener Maar record. Our results do not provide evidence for overall markedly dry climatic conditions having prevailed during the Younger Dryas. Rather, a two-phasing of the Younger Dryas is supported, with moderate wet conditions at the Allerød level during the first half and drier conditions during the second half of the Younger Dryas. Moreover, our results suggest that the amplitude of RH changes during the Early Holocene was more pronounced than during the Younger Dryas. This included the occurrence of a “Preboreal Humid Phase”. One possible explanation for this unexpected finding could be that solar activity is a hitherto underestimated driver of central European RH changes in the past." @default.
• W2890621156 created "2018-09-27" @default.
• W2890621156 creator A5000925986 @default.
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• W2890621156 creator A5085150756 @default.
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• W2890621156 creator A5091592716 @default.
• W2890621156 date "2019-04-09" @default.
• W2890621156 modified "2023-10-14" @default.
• W2890621156 title "How dry was the Younger Dryas? Evidence from a coupled &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;H–&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O biomarker paleohygrometer applied to the Gemündener Maar sediments, Western Eifel, Germany" @default.
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