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

使用西班牙东南部精确年代的洞穴化石对过去 250 ka 期间的气候变化进行多代理重建。

基本信息

批准号：
290435864
负责人：
Dr. Regina Mertz, Ph.D.
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：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/290435864?language=en
关键词：
Multi proxy reconstruction climate variability

项目摘要

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.

该提案的目标是利用洞穴岩重建西班牙东南部过去 250 ka 期间的陆地气候变化。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暖期和热浪发生频率和持续时间的增加，以及干旱强度和持续时间的增加。这些变化给环境和经济带来了巨大的风险。因此，对当前干旱地区的陆地古气候记录进行调查非常重要。由于气候干燥，西班牙东南部的气候档案对降水的细微变化都非常敏感。然而，来自伊比利亚南部陆地气候档案的信息有限，并且大多局限于花粉和沉积物序列，这些序列的时间分辨率相对较低，很难超出放射性碳测年范围。目前，日期准确的洞穴气候代理记录主要局限于西班牙北部，但该地区的特点是相对较高的湿度和温和的温度。我们将根据西班牙东南部奎瓦维多利亚的精确年代的流石序列，以高时间分辨率重建过去的气候变化，该地区以其壮观的更新世动物群而闻名。我们将重点关注最后 250 ka，它包含在多个钻芯中。目前还没有来自西班牙东南部的这一时期的精确日期、高分辨率陆地记录。初步数据显示，Cueva Victoria 的流石生长对过去降水的变化高度敏感，并且流石的生长阶段与过去的全球变暖阶段相关。因此，通过 230Th/U 方法进行精确测年将使我们能够确定海洋同位素第 1、3、5 和 7 阶段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，我们将生成由相应生长阶段的高分辨率稳定同位素和微量元素剖面组成的多代理记录。这将使我们能够根据过去的气候变化对代理信号进行强有力的解释。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在过去大约一年中的巨大潜力。西班牙东南部250ka。该材料的一部分已经成为申请人之前DFG提案的焦点，但不幸的是被拒绝了。审稿人的主要批评是前期工作不够充分。然而，他们强调了该项目的总体潜力。根据他们的建设性意见，我建立了新的合作，并生成了额外的年龄和气候代理数据，以证明这些样本是一个非常有前途的古气候档案，可以准确测定日期。