气候变化领域集成服务门户(CCPortal): How dry was the Younger Dryas? Evidence from a coupled δ2H-δ18O biomarker paleohygrometer applied to the Gemündener Maar sediments, Western Eifel, Germany

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DOI	10.5194/cp-15-713-2019
	How dry was the Younger Dryas? Evidence from a coupled δ2H-δ18O biomarker paleohygrometer applied to the Gemündener Maar sediments, Western Eifel, Germany
	Hepp J.; Wüthrich L.; Bromm T.; Bliedtner M.; Schäfer I.K.; Glaser B.; Rozanski K.; Sirocko F.; Zech R.; Zech M.
发表日期	2019
ISSN	18149324
起始页码	713
结束页码	733
卷号	15 期号:2
英文摘要	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. © 2019 Author(s).
语种	英语
scopus关键词	Allerod; biomarker; catchment; climate conditions; cold wave; enrichment; Holocene; hydrogen isotope; instrumentation; isotopic composition; late glacial; oxygen isotope; paleoclimate; precipitation (climatology); reconstruction; Younger Dryas; Eifel; Germany; Rhineland-Palatinate
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153218
作者单位	Department of Geomorphology and BayCEER, University of Bayreuth, Universitätsstrasse 30, Bayreuth, 95440, Germany; Institute of Agronomy and Nutritional Sciences Soil Biogeochemistry, Martin Luther University Halle-Wittenberg, Von-Seckendorff-Platz 3, Halle, 06120, Germany; Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, Kraków, 30-059, Poland; Institute of Geosciences, Group of Climate and Sediments, Johannes Gutenberg University of Mainz, J.-J.-Becher-Weg 21, Mainz, 55128, Germany; Institute of Geography, Dresden University of Technology, Helmholtzstrasse 10, Dresden, 01062, Germany; Institute of Geography, Department of Physical Geography, Friedrich Schiller University of Jena, Löbdergraben 32, Jena, 07743, Germany
推荐引用方式 GB/T 7714	Hepp J.,Wüthrich L.,Bromm T.,et al. How dry was the Younger Dryas? Evidence from a coupled δ2H-δ18O biomarker paleohygrometer applied to the Gemündener Maar sediments, Western Eifel, Germany[J],2019,15(2).
APA	Hepp J..,Wüthrich L..,Bromm T..,Bliedtner M..,Schäfer I.K..,...&Zech M..(2019).How dry was the Younger Dryas? Evidence from a coupled δ2H-δ18O biomarker paleohygrometer applied to the Gemündener Maar sediments, Western Eifel, Germany.Climate of the Past,15(2).
MLA	Hepp J.,et al."How dry was the Younger Dryas? Evidence from a coupled δ2H-δ18O biomarker paleohygrometer applied to the Gemündener Maar sediments, Western Eifel, Germany".Climate of the Past 15.2(2019).