德国舍宁根旧石器时代遗址中更新世间冰期-冰期过渡期间的温度和古湖泊演变

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2024-07-10 DOI:10.1111/bor.12670
Kim J. Krahn, Brigitte Urban, Sylvia Pinkerneil, David J. Horne, Mario Tucci, Andreas Koutsodendris, Antje Schwalb
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引用次数: 0

摘要

舍宁根下层旧石器时代遗址的中更新世莱恩斯多夫序列为重建保存完好的后荷尔斯泰因环境从间冰期向冰川期的过渡及其高度动态的相邻气候振荡提供了机会。结合 13 II 号发掘地点两个湖岸序列的生物代用指标、元素组成和稳定同位素比值,我们展示了气候、水文和流域植被覆盖的反复变化。利用相互梭形目动物温度范围(MOTR)方法,基于新的梭形目动物定量重建了夏季和冬季平均气温,首次提供了有关气温演变的详细信息。冰期温度最高值(可能与海洋同位素阶段 9e 相对应)之后是第一个干燥期,在莱因斯多夫序列的较年轻部分则是第二个干燥期。这两个时期的特点都是降水/蒸发比降低、集水区植被覆盖减少以及地表泉水流入量增加。这两个草原(疏林地)阶段的气温重建结果显示,1 月平均气温(-4-0 °C)和 7 月平均气温(+17-19 或 +17-21 °C)的范围很窄,这表明,虽然夏季与今天的气温相似,但冬季至少要冷 1 °C,暗示着大陆性气候更加明显。对相邻的林地和草原(林地)阶段气温的精确估算受到 MOTR 方法产生的较宽范围(一月平均气温-4-3 °C,七月平均气温+15-21 °C)的影响。微化石和稳定同位素记录的变化表明,植被覆盖面积扩大,地表径流和侵蚀减少,河流和地下水排放量增加,这表明气候总体上更加湿润,降水/蒸发比增加,季节性温度变化减少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Temperature and palaeolake evolution during a Middle Pleistocene interglacial–glacial transition at the Palaeolithic locality of Schöningen, Germany

Temperature and palaeolake evolution during a Middle Pleistocene interglacial–glacial transition at the Palaeolithic locality of Schöningen, Germany

The Middle Pleistocene Reinsdorf sequence at the Lower Palaeolithic sites of Schöningen offers the opportunity to reconstruct a rarely well-preserved post-Holsteinian environmental transition from an interglacial into a glacial phase along with its highly dynamic interjacent climatic oscillations. Combining biological proxies, element composition and stable isotope ratios of two lakeshore sequences at excavation site 13 II, we demonstrate repeated variations in climate, hydrology and catchment vegetation cover. New ostracod-based quantitative mean summer and winter air temperature reconstructions with the Mutual Ostracod Temperature Range (MOTR) method provide the first detailed information about the temperature evolution. The interglacial temperature maximum, probably corresponding to Marine Isotope Stage 9e, is followed by a first dry phase and, during the younger part of the Reinsdorf sequence, by a second dry period. Both were marked by lower precipitation/evaporation ratios, reduced vegetation cover in the catchment and increased surface inflows from springs. Temperature reconstructions of these two steppe (open woodland) phases yield very narrow ranges for mean January (−4–0 °C) and July (+17–19 or +17–21 °C) air temperatures, demonstrating that, while summers were similar to those of today, winters were at least 1 °C colder, hinting at a more pronounced continental climate. Precise temperature estimates for the interjacent woodland and steppe (woodland) phase are hindered by generally wider ranges produced by the MOTR method (January mean −4–3 °C, July mean +15–21 °C). The development of a more extensive vegetation cover, reducing surface runoff and erosion in favour of increased river and groundwater discharge, as indicated by a shift in microfossil and stable isotope records, suggests generally more humid climates with higher precipitation/evaporation ratios as well as reduced seasonal temperature variations.

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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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