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.

重建以前的间冰期期间的气候变化以及精确确定其时间和持续时间提供了有关我们的气候系统的重要信息，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，因为它表明。过去 80 万年中工业化前大气中 CO2 和 CH4 的最高浓度。在原始项目的框架内，我们精确地确定了五个德兴洞（德国西部）的石笋。由于德兴洞位于冰川时期的永久冻土地区，洞穴内的洞穴内生长对温暖和潮湿的气候条件非常敏感，因此可以精确测定洞穴内的生长阶段。确定 MIS 9 及其子阶段的时间和持续时间此外，我们还生成高分辨率 δ13C 和 δ18O 值以及微量元素。记录，这将产生完全覆盖 MIS 9 的复制的、日期精确的多代理记录。不幸的是，由于多种原因（洁净实验室的施工工作、新安装的 MC-ICPMS 的一些问题、因此，原始提案中概述的分析无法按预期进行，并且至少推迟了一年。因此，洞穴的年代测定和代理分析都可能会发生。不是在预定的时间范围内完成，并且迄今为止不可能根据过去的气候变化来解释数据集。