Reconstruction of decadal to orbital-scale climate variability during Marine Isotope Stage 9 using precisely dated multi-proxy speleothem records from Central Europe – Part II

使用来自中欧的精确日期多代理洞穴记录重建海洋同位素阶段 9 期间十年至轨道尺度的气候变化 - 第二部分

• 批准号: 418149488
• 负责人: Professor Dr. Denis Scholz
• 金额: --
• 依托单位: Arbeitsgruppe Speläothemforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/418149488?language=en
• 关键词: Reconstruction; decadal; orbital; scale; climate

Reconstruction of climate variability during previous interglacials as well as precise determination of their timing and duration provides important information about our climate system. Marine Isotope Stage (MIS) 9 (340,000-280,000 years BP) is a particularly important interglacial in this context because it shows the highest preindustrial atmospheric CO2 and CH4 concentrations of the last 800,000 years.In the framework of the original project, we precisely date five stalagmites from Dechen Cave (western Germany). Since Dechen Cave is located in a region with permafrost during glacial times, speleothem growth within the cave is very sensitive to warmer and wetter climate conditions. Precise dating of the growth phases of the speleothems thus enables precise determination of the timing and duration of MIS 9 and its sub-stages. In addition, we generate high-resolution δ13C and δ18O values as well as trace element records, which will result in a replicated, precisely dated multi-proxy record completely covering MIS 9.Unfortunately, the original project was severely delayed due to several reasons (construction work in the clean laboratory, several problems with the newly installed MC-ICPMS, and in particular the global COVID-19 pandemic). As a result, the analyses outlined in the original proposal could not be conducted as intended and were delayed by at least one year. Therefore, both the dating and the proxy analyses of the speleothems could not be finished in the scheduled time frame, and the interpretation of the dataset in terms of past climate variability has so far been impossible.

重建前几次间冰期的气候变率，以及精确确定其时间和持续时间，为我们的气候系统提供了重要信息。海洋同位素阶段（MIS）9（距今340，000 - 280，000年）是一个特别重要的间冰期，因为它显示了过去800，000年来工业化前大气中最高的CO2和CH 4浓度。由于德陈洞位于冰川时期的永久冻土区，洞穴内的洞穴沉积物生长对温暖和潮湿的气候条件非常敏感。因此，洞穴沉积物生长阶段的精确定年能够精确确定MIS 9及其子阶段的时间和持续时间。此外，我们还生成了高分辨率的δ 13 C和δ 18 O值以及微量元素记录，这将产生一个完全覆盖MIS 9的复制的、精确标注日期的多代理记录。不幸的是，由于几个原因（洁净实验室的建设工作、新安装的MC-ICPMS的几个问题，特别是全球COVID-19大流行），最初的项目被严重推迟。因此，原提案中概述的分析无法按计划进行，并至少推迟了一年。因此，洞穴沉积物的定年和代用分析都无法在预定的时间范围内完成，而且迄今为止无法根据过去的气候变化对数据集进行解释。