Multi-proxy reconstruction of climate variability during the last 250 ka using precisely dated speleothems from south-eastern Spain.

这项建议的目的是重建陆地气候变率在西班牙东南部在过去的250万年使用洞穴沉积物。西班牙东南部是南欧最干旱的地区之一。根据政府间气候变化专门委员会的最新报告，目前干旱地区将遭受越来越频繁和持续时间越来越长的温暖期和热浪，以及越来越严重和持续时间越来越长的干旱。这些变化沿着着环境和经济的巨大风险。从目前干旱地区的陆地古气候记录的调查，因此，非常重要。由于干燥的条件下，气候档案从西班牙东南部是非常敏感的，即使是降水的细微变化。然而，来自伊比利亚南部陆地气候档案的信息是有限的，主要限于花粉和沉积物序列，具有相对较低的时间分辨率，很难在放射性碳测年范围之外进行测年。良好的洞穴气候代理记录，目前主要限于北方的西班牙，这是，然而，其特点是相对较高的湿度和温和的temperates.We将重建过去的气候变率在高时间分辨率从一个精确的日期流石序列在Cueva维多利亚，西班牙东南部，这是众所周知的壮观的更新世动物。我们将重点关注最后250 ka，这是包含在几个钻孔岩心。在此期间，一个精确的日期，高分辨率的陆地记录从东南部的西班牙是不可用的yester.Preliminary数据显示，流石生长在Cueva维多利亚是高度敏感的过去的降水变化和流石生长阶段与过去的全球变暖阶段。因此，通过230 Th/U法进行精确测年，将使我们能够确定海洋同位素阶段1、3、5和7以及西班牙东南部陆地相应子阶段的时间和持续时间。此外，我们将产生多代理记录组成的高分辨率稳定同位素和微量元素配置文件相应的生长阶段。这将有助于对过去气候变率方面的代用信号进行强有力的解释。在初步数据集中观察到的代理信号的高灵敏度强调了这个独特的古气候档案的最后一个世纪的巨大潜力。该材料的一部分已经是申请人先前DFG提案的焦点，但不幸的是被拒绝。审查人员的主要批评是初步工作不够。然而，他们强调了该项目的总体潜力。在他们的建设性意见之后，我建立了新的合作关系，并生成了额外的年龄和气候代用数据，以证明这些样本是一个非常有前途的古气候档案，可以准确地确定日期。

The objective of this proposal is the reconstruction of terrestrial climate variability in south-eastern Spain during the last 250 ka using speleothems. South-eastern Spain is one of the driest regions in southern Europe. According to the last IPCC report, currently arid regions will suffer from an increasing frequency and duration of warm spells and heat waves as well as increasing intensity and duration of droughts. These changes go along with substantial risks for both the environment and economy. Investigation of terrestrial paleoclimate records from currently arid areas is, thus, of great importance.Due to the dry conditions, climate archives from south-eastern Spain are highly sensitive to even subtle changes in precipitation. However, information from terrestrial climate archives in southern Iberia is limited and mostly restricted to pollen and sediment sequences, which have a relatively low temporal resolution and are difficult to date beyond the range of radiocarbon dating. Well-dated speleothem climate proxy records are currently mainly restricted to the northern part of Spain, which is, however, characterized by relatively high humidity and mild temperatures.We will reconstruct past climate variability at high temporal resolution from a precisely dated flowstone sequence at Cueva Victoria, south-eastern Spain, which is well known for its spectacular Pleistocene fauna. We will focus on the last 250 ka, which are contained in several drill cores. For this period, a precisely dated, high-resolution terrestrial record from south-eastern Spain is not available yet.Preliminary data show that flowstone growth at Cueva Victoria is highly sensitive to past changes in precipitation and that flowstone growth phases are related to past global warm phases. Precise dating by the 230Th/U-method will thus enable us to determine the timing and duration of Marine Isotope Stages 1, 3, 5 and 7 as well as the corresponding sub-stages in terrestrial south-eastern Spain. Furthermore, we will generate multi-proxy records consisting of high-resolution stable isotope and trace element profiles for the corresponding growth phases. This will enable a robust interpretation of the proxy signals in terms of past climate variability. The high sensitivity of the proxy signals observed in the preliminary data set emphasizes the large potential of this unique paleoclimate archive for the last ca. 250 ka in south-eastern Spain.Part of this material was already in the focus of a previous DFG proposal by the applicant, but was unfortunately rejected. The main criticism of the reviewers was that the preliminary work was insufficient. However, they highlighted the general potential of the project. Following their constructive comments, I established new collaborations and generated additional age and climate proxy data to proof that the samples are a very promising paleoclimate archive, which can be accurately dated.