Identifying abrupt climate change in SE Europe during MIS 12-11 based on high-resolution pollen analysis of the Tenaghi Philippon archive (NE Greece)

该项目旨在以前所未有的时间分辨率(约150年)为海洋同位素第12阶段和第11阶段产生新的陆地花粉记录。这将为第四纪最极端的冰期和间冰期的气候演变提供详细的洞察，从而有助于更好地了解造成气候突然变化的机制。项目目标将通过对Tenaghi Philippon(希腊东北部)标志性的陆地气候档案进行分析，利用2009年回收的新岩芯来实现。具体地说，该项目将重建(I)管理信息系统12期间的D-O和类似Heinrich的气候变化，这是海洋和冰川记录中第四纪最冷的冰川；以及(Ii)管理信息系统11期间生态系统对气候逐渐变暖和突变的响应，这是当前间冰期的最佳轨道模拟之一。Tenaghi Philippon档案最适合于解决这些目标，因为(I)其异常的地层完整性；(Ii)它靠近嗜热植物的冰川避难所，这最大限度地减少了花粉数据中记录的气候强迫和植被响应之间的时差；(Iii)它在记录北半球高纬度气候变异性方面具有高度的敏感性。该项目的目标将在对394个花粉样本进行分析的基础上实现，这些样本的分辨率将比以前Tenaghi Philippon的分辨率高出约5倍。结合正在进行的对同一岩心的隐蔽藻和X射线荧光分析(DFG项目KO4960/3-1)，将根据强大的年代地层框架对已确定的植被事件进行校准，以便与东地中海(ODP967站)、伊比利亚边缘和北大西洋(ODP980和983站)的海洋记录进行详细比较。该项目将为第四纪期间东地中海区域短期气候和环境变化的性质提供新的见解；归根结底，它将有助于更好地理解在边界条件下气候变化的触发机制，因为它们是在管理信息系统12和11期间实现的。

The project aims to generate a new terrestrial pollen record for Marine Isotope Stages (MIS) 12 and 11 at unprecedented temporal resolution (~150 years) for that time interval. This will provide detailed insight into the climate evolution of the most extreme glacial and interglacial intervals of the Quaternary, thus contributing to a better understanding of the mechanisms responsible for abrupt climate change. The project goals will be achieved via analysis of the iconic terrestrial climate archive of Tenaghi Philippon (NE Greece) using new cores recovered in 2009. Specifically, the project will reconstruct (i) the D-O- and Heinrich-like climate variability during MIS 12, which represents the coldest glacial of the Quaternary in marine and ice records; and (ii) the ecosystem response to gradual climate warming and abrupt change during MIS 11, which serves as one of the best orbital analogues for the current interglacial. The Tenaghi Philippon archive is optimally suited for addressing these objectives due to (i) its exceptional stratigraphical completeness; (ii) its proximity to glacial refugia of thermophilous plants, which minimizes the time lag between climate forcing and vegetation response as documented in pollen data; and (iii) its high sensitivity in recording Northern Hemisphere high-latitude climate variability. The project goals will be reached based on the analysis of 394 pollen samples that will yield a ~5x higher resolution than previously available for Tenaghi Philippon. In combination with ongoing cryptotephra and XRF analyses on the same cores (DFG project KO4960/3-1), the identified vegetation events will be calibrated against a robust chronostratigraphical framework, allowing detailed comparison with marine records from the Eastern Mediterranean (ODP Site 967), the Iberian Margin, and the North Atlantic (ODP Sites 980 and 983). The project will provide new insights into the nature of short-term climate and environmental change in the Eastern Mediterranean region during the Quaternary; ultimately, it will contribute to a better understanding of the trigger mechanisms of climate change under boundary-condition endmembers as they were realized during MIS 12 and 11.