Early Holocene Thermal Maximum recorded by branched tetraethers and pollen in Western Europe (Massif Central, France)

QUATERNARY SCIENCE REVIEWS

卷:228

Review

Martin, Celine^1,2  Menot, Guillemette²  Thouveny, Nicolas¹  Peyron, Odile³  Andrieu-Ponel, Valerie⁴  Montade, Vincent^3,5  Davtian, Nina¹  Reille, Maurice⁶  Bard, Edouard¹ 

[1] Aix Marseille Univ, CNRS, IRD, INRA,Coll France,CEREGE,Europole Mediterraneen Ar, BP 80, F-13545 Aix En Provence 4, France

[2] Univ Lyon 1, Univ Lyon, CNRS, UMR 5276 LGLTPE,ENS Lyon, F-69364 Lyon, France

[3] Univ Montpellier, CNRS, Inst Sci Evolut Montpellier, IRD,EPHE, Montpellier, France

[4] Aix Marseille Univ, Univ Avignon, CNRS, IRD,IMBE,Europole Mediterraneen Arbois, BP 80, F-13545 Aix En Provence 4, France

[5] Georg August Univ Gottingen, Dept Palynol & Climate Dynam, Albrecht von Haller Inst Plant Sci, Untere Karspille 2, D-37073 Gottingen, Germany

[6] Venede, F-48000 Mende, France

关键词: Holocene;    Quantitative paleoclimate reconstructions;    Continental biomarkers;    Branched GDGTs;    Pollen;    Transfer functions;    Western Europe;   

DOI  :  10.1016/j.quascirev.2019.106109

来源: Elsevier

【 摘 要 】

The evolution of temperatures during the Holocene is controversial, especially for the early Holocene. The occurrence of the Holocene Thermal Maximum (HTM) during the early Holocene has recently been reconsidered and seasonal biases have been suggested in the paleoclimatic proxies. High regional variability and a low number of reliable and continuous quantitative reconstructions compared with the oceanic realm further complicate study of the Holocene climate in the continental realm. We analyzed branched glycerol dialkyl glycerol tetraethers (brGDGTs), an organic paleothermometer, and palynological signals as part of a multiproxy analysis of the sedimentary record from Lake St Front, in the Massif Central (France). Identification of a shift in brGDGT sources through the Holocene required removing terrigenous influences from the temperature signal. BrGDGT- and pollen-inferred paleotemperature reconstructions (based on the Modern Analog Technique and the Weighted Averaging Partial Least Squares method) were compared. Both showed a thermal maximum during the early Holocene followed by a decrease of temperatures. We evaluated biases which could potentially influence the reconstructed signal. There was no evidence for a summer temperature bias either for brGDGT-derived temperatures or for pollen-derived temperatures. The Lake St Front data, in agreement with other regional records, confirm the occurrence of the HTM as a general warm period during the early Holocene followed by mid-Holocene cooling in Western Europe and suggest that seasonal biases are not the main explanation of the Holocene conundrum - the disagreement between model simulations and proxy-based temperature reconstructions for the northern hemisphere. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

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