Southern Patagonian climate during the last 55,000 years: insights from lipid biomarkers and their isotopes (PASADO Lipids)

该项目的总体目标是建立过去55,000年来巴塔哥尼亚南部温度、降水和水文平衡变化的定量重建。在拉古纳波特罗克艾克的ICDP框架内钻取的帕萨多岩芯提供了材料，能够根据微生物膜脂类和化合物特有的同位素组成调查新的有机地球化学参数。为了奠定良好的科学解释基础，将对湖泊有机质来源进行广泛调查，并开展区域气候标定。对沉积档案的应用将提供对过去温度、降水和蒸发变化的新见解，并将其与古生物、沉积学和地球化学研究的现有数据进行比较。将这些分析延长到55000年前，将使我们能够详细评估全新世和末次冰川期间热带气候对高纬度气候过程的复杂干扰。此外，这些研究还将加深我们对各种环境因素对所调查的和新的代理参数的影响的理解。

This project’s overarching aim is to establish quantitative reconstructions of changes in temperature, precipitation and hydrologic balance in southern Patagonia over the last 55,000 years. The PASADO core drilled within the framework of the ICDP in Laguna Potrok Aike provides the material which enables to investigate new organic-geochemical parameters based on microbial membrane lipids and compound-specific isotope compositions. To lay a sound scientific basis for interpretation, an extensive survey of lake organic matter sources will be conducted and regional climatic calibrations will be developed. Application to the sedimentary archive will provide new insights into past temperature, precipitation and evaporation changes which will be compared to existing data from paleo-biological, sedimentological and geochemical studies. Extending these analyses to 55,000 years ago will allow a detailed evaluation of the complex interference of tropical with high-latitude climate processes during the Holocene and the Last Glacial. Besides, these studies will further our understanding of the influences of various environmental factors on the investigated and novel proxy parameters.