Hydrological and ecological changes in western Europe between 3200 and 2000 years BP derived from lipid biomarker δD values in lake Meerfelder Maar sediments

QUATERNARY SCIENCE REVIEWS

卷:172

Article

Rach, O.^1,2  Engels, S.³  Kahmen, A.⁴  Brauer, A.⁵  Martin-Puertas, C.^5,6  van Geel, B.⁷  Sachse, D.¹ 

[1] GFZ German Res Ctr Geosci, Sect 5 1, Geomorphol, Organ Surface Geochem Lab, D-14473 Potsdam, Germany

[2] Univ Potsdam, Inst Earth & Environm Sci, Karl Liebknecht Str 24-25, D-14476 Potsdam, Germany

[3] Univ Nottingham, Sch Geog, Ctr Environm Geochem, Univ Pk, Nottingham, England

[4] Univ Basel, Dept Environm Sci, Bot, Schonbeinstr 6, CH-4056 Basel, Switzerland

[5] GFZ German Res Ctr Geosci, Sect Climate Dynam & Landscape Evolut 5 2, D-14473 Potsdam, Germany

[6] Royal Holloway Univ London, Dept Geog, Egham TW20 0EX, Surrey, England

[7] Univ Amsterdam, Inst Biodivers & Ecosyst Dynam, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

关键词: Holocene;    Climate dynamics;    Paleoclimatology;    Western Europe;    Continental biomarkers;    Organic geochemistry;    Stable isotopes;    Vegetation dynamics;   

DOI  :  10.1016/j.quascirev.2017.07.019

来源: Elsevier

【 摘 要 】

One of the most significant Late Holocene climate shifts occurred around 2800 years ago, when cooler and wetter climate conditions established in western Europe. This shift coincided with an abrupt change in regional atmospheric circulation between 2760 and 2560 cal years BP, which has been linked to a grand solar minimum with the same duration (the Homeric Minimum). We investigated the temporal sequence of hydroclimatic and vegetation changes across this interval of climatic change (Homeric climate oscillation) by using lipid biomarker stable hydrogen isotope ratios (ED values) and pollen assemblages from the annually-laminated sediment record from lake Meerfelder Maar (Germany). Over the investigated interval (3200-2000 varve years BP), terrestrial lipid biomarker ED showed a gradual trend to more negative values, consistent with the western Europe long-term climate trend of the Late Holocene. At ca. 2640 varve years BP we identified a strong increase in aquatic plants and algal remains, indicating a rapid change in the aquatic ecosystem superimposed on this long-term trend. Interestingly, this aquatic ecosystem change was accompanied by large changes in ED values of aquatic lipid biomarkers, such as nC(21) and nC(23) (by between 22 and 30%(0)). As these variations cannot solely be explained by hydroclimate changes, we suggest that these changes in the Wag value were influenced by changes in n-alkane source organisms. Our results illustrate that if ubiquitous aquatic lipid biomarkers are derived from a limited pool of organisms, changes in lake ecology can be a driving factor for variations on sedimentary lipid MN values, which then could be easily misinterpreted in terms of hydro climatic changes. (C) 2017 Elsevier Ltd. All rights reserved.

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