对比斯平根古湖沉积物演替(德国北部)的重新调查显示,欧洲中北部的末次间冰期(Eemian)至少持续了约 15000 年

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2024-02-12 DOI:10.1111/bor.12649
Stefan Lauterbach, Frank H. Neumann, Rik Tjallingii, Achim Brauer
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引用次数: 0

摘要

研究过去冰期的气候和环境变化,可以加深我们对冰期边界条件下气候变异的自然速率和范围的理解。然而,由于年代学的不同和不确定性,比较来自不同地区和档案馆的过去冰期古气候记录往往变得复杂。例如,欧洲末次冰期的持续时间仍然存在争议,因为南欧的古气候记录表明持续时间约为16500-18000年,而根据对德国北部比斯平根部分年层状(变异)古湖泊沉积物的分析,推断欧洲中北部末次冰期的持续时间只有约11000年。为了解决这一差异,我们在此展示了来自比斯平根古湖沉积物演替的一个新沉积岩芯的沉积物微地貌、地球化学和花粉数据,涵盖了整个末次间冰期(埃厄姆期)和末次冰期(魏希塞尔期)的最早部分。特别是,我们提供的证据表明,由于对不完整沉积物岩芯的调查,比斯平根末次间冰期的持续时间迄今肯定被低估了。通过对新的沉积岩芯上的非变质断面进行微观变质计数和沉积速率估算,我们表明欧洲中北部的埃米期可能至少持续了约 15000 年,比之前认为的要长约 4000 年。这一新的持续时间估计与南欧古气候记录的结果更为一致,从而澄清了末次间冰期末期几千年来跨欧洲植被梯度陡峭的谜团。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Re-investigation of the Bispingen palaeolake sediment succession (northern Germany) reveals that the Last Interglacial (Eemian) in northern-central Europe lasted at least ~15 000 years

Re-investigation of the Bispingen palaeolake sediment succession (northern Germany) reveals that the Last Interglacial (Eemian) in northern-central Europe lasted at least ~15 000 years

Investigating past interglacial climatic and environmental changes can enhance our understanding of the natural rates and ranges of climate variability under interglacial boundary conditions. However, comparing past interglacial palaeoclimate records from different regions and archives is often complicated by differing and uncertain chronologies. For instance, the duration of the Last Interglacial in Europe is still controversial as southern European palaeoclimate records suggest a duration of ~16 500–18 000 years, while a length of only ~11 000 years in northern-central Europe was previously inferred from the analysis of partly annually laminated (varved) palaeolake sediments recovered at Bispingen, northern Germany. To resolve this discrepancy, we here present sediment microfacies, geochemistry and pollen data from a new sediment core from the Bispingen palaeolake sediment succession, covering the entire Last Interglacial (Eemian) and the earliest part of the Last Glacial (Weichselian). In particular, we provide evidence that the duration of the Last Interglacial at Bispingen must have been hitherto underestimated due to the investigation of an incomplete sediment core. Using microscopic varve counting and sedimentation rate estimates for non-varved sections on the new sediment core, we show that the Eemian in northern-central Europe probably lasted at least ~15 000 years, about 4000 years longer than previously thought. This new duration estimate is in much better agreement with results from southern European palaeoclimate records, clarifying the enigma of a steep trans-European vegetation gradient for several millennia at the end of the Last Interglacial.

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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
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