Suborbital-scale climate variability of the last three glacial/interglacial cycles – high-resolution environmental reconstructions from sediments of the Rodderberg crater (Germany)

这项提议的主要目标将是测试亚轨道尺度的北半球气候变化是否是罗德伯格陨石坑(德国西部波恩市以南)沉积档案中记录的环境变化的触发因素。由于地球系统的快速变化与正在进行的关于气候变化的辩论越来越相关，而且人们对环境系统对中欧这种变化的反应知之甚少，因此必须研究提供可比信息的大陆记录，特别是以前间冰期的记录。这项研究的重点是利用高分辨率XRF岩心扫描结合块体地球化学对这类沉积记录进行地球化学特征研究。此外，将根据对摇蚊、硅藻、花粉和稳定同位素的研究，定量重建温度和其他环境参数，以确定千年至百年尺度的环境变异性。中更新世至晚更新世记录的时间控制将通过放射性碳和发光测年来实现，并辅之以年代学。这一方法将产生最后三个冰川/间冰期周期的年龄/深度模型。对时间尺度上的整个数据集进行严格的统计评估将产生化学地层学，以确定具有环境和古气候意义的指标。这项拟议的研究最终将提供对最后~320 ka气候强迫环境条件的深入和高分辨率的见解，重点放在三个叠加的最古老和最明显的间冰期。这一间冰期，很可能相当于霍尔斯泰期，代表了当前的间冰期--全新世--因此可能为未来气候趋势的自然基线提供线索。

The main objective of this proposal will be to test if suborbital-scale northern hemispheric climatic variabilities are the trigger for environmental changes recorded in the sedimentary archive of the Rodderberg crater (south of the city of Bonn, western Germany). As rapid variability of the Earth’s system is increasingly relevant for ongoing debates about climate change and little is known about the responses of environmental systems to such modifications from Central Europe, it is important to study continental records that provide comparable information especially from previous interglacials. The proposed research focuses on the geochemical characterisation of such a sedimentary record by high-resolution XRF core-scanning together with bulk geochemistry. Additionally, quantitative reconstructions of temperature and other environmental parameters will become available based on the study of chironomids, diatoms, pollen and stable isotopes to identify millennial- to centennial-scale environmental variability. Time control for this Middle to Late Pleistocene record will be achieved by radiocarbon and luminescence dating supported by tephrochronology. This approach will lead to an age/depth model for the last three glacial/interglacial cycles. Rigorous statistical evaluation of the entire dataset on timescale will generate a chemostratigraphy for the identification of indicators with environmental and palaeoclimatic significance. The proposed study will eventually provide deep and high-resolution insights into climatically forced environmental conditions for the last ~320 ka with a strong focus on the oldest and most pronounced of the three interglacials in superposition. This interglacial, most likely equivalent to the Holsteinian, is representative for the current interglacial – the Holocene – and thus might give hints for the natural baseline of future climate trends.