Gas-IRMS for high-precision analysis of Δ17O with sample preparation line

使用样品制备线对 Ύ17O 进行高精度分析的气体 IRMS

• 批准号: 426320572
• 金额: --
• 依托单位: Universität zu Köln
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/426320572?language=en
• 关键词: Gas; IRMS; precision; analysis; 17O

The most recent work of the PI has highlighted novel fields of application for the System of 16O - 17O - 18O in the field of quantitative isotope hydrology of the past and present. In the current project, at first we will build a semi-automated preparation line to convert carbonate-bound oxygen to pure oxygen gas, which is required for the analysis of Delta 17O at sufficient precision. With the applied-for Gas-IRMS we seek to systematically investigate evaporation from soil, from ground water aquifers, and other water reservoirs of the Earth’s surface. The aim of these studies is to quantify the water budget of arid and semi-arid environments. This includes the identification of seasonally varying water sources and local evaporative water recycling. In a pilot study we also seek to apply the method to quantify the water budget of drought-resistant plants. Results from theses systematic studies will then be applied to quantify past evaporation and reconstruct changes in the hydroclimatic cycle, based on Delta 17O analysis in geologic samples of pedogenic carbonate (calcretes from Namibia), lacustrine gypsum (Laguna de Fuente de Piedro, Spain), and lacustrine carbonate (Lake Van, Turkey). In additional projects with co-applicants, we seek to apply classical H, C, N, and O isotope analysis in the fields of paleoceanography and prehistoric archaeology. In the first of the two, the aim is to reconstruct past variability of exchange of water masses between the Mediterranean and the Atlantic and its role in Atlantic thermohaline circulation. A significant part of this undertaking is the development of enhanced proxy-tools for reconstructing contour currents along the continental slope and for reconstructing deep-water ventilation. These tools are based on C and O isotope analysis of benthic foraminifera shells in combination with trace element analysis. In the field of prehistoric archaeology there are two major objectives. By using H, C, and O isotope analysis in wood - partly supplied by the extensive Cologne Dendro-Archive - we seek to reconstruct past climate and environmental variability with annual resolution for the Holocene of central Europe. By combining these findings with C and N isotope analysis from bones, we seek to work out the evolution of residential mobility patterns and changing agricultural practices in the late Neolithic. The other main objective concerns trophic levels and evolution of food resources in the paleolithic, where we first seek to establish the isotopic baseline across various climate oscillations between 90 and 40 ka BP from the numerous animal bones found in the long sequence of deposits from Sesselfelsgrotte, Bavaria. In another study, the objective is to derive movements of hunted animals - in particular reindeer and horse - from isotope analysis of bones found at a number of well-dated hunter camp sites of late pleistocene age across central Europe.

PI最近的工作突出了16O - 17O - 18O系统在过去和现在的定量同位素水文学领域的新应用领域。在目前的项目中，我们首先将建立一条半自动化的制备线，将碳酸盐结合的氧气转化为纯氧气，这是对Delta 17O进行足够精度分析所必需的。使用已申请的Gas-IRMS，我们试图系统地调查土壤、地下含水层和地球表面其他水库的蒸发。这些研究的目的是量化干旱和半干旱环境的水收支。这包括确定季节性变化的水源和当地蒸发水循环利用。在一项试点研究中，我们还试图应用该方法来量化抗旱植物的水分收支。然后，这些系统研究的结果将应用于量化过去的蒸发和重建水文气候循环的变化，这是基于Delta 17O对成土碳酸盐（来自纳米比亚的calcretes）、湖泊石膏（西班牙的Laguna de Fuente de Piedro）和湖泊碳酸盐（土耳其的Van湖）的地质样品的分析。在与共同申请者的其他项目中，我们寻求在古海洋学和史前考古学领域应用经典的氢、碳、氮和氧同位素分析。第一个目标是重建过去地中海和大西洋之间水团交换的变化及其在大西洋温盐环流中的作用。这项工作的一个重要部分是开发增强的替代工具，用于重建沿大陆斜坡的等高线流和重建深水通风。这些工具是基于底栖有孔虫壳的C和O同位素分析，并结合微量元素分析。在史前考古领域有两个主要目标。通过使用木材中的H、C和O同位素分析（部分由科隆树endro档案馆提供），我们试图重建中欧全新世过去的气候和环境变化。通过将这些发现与骨骼的C和N同位素分析相结合，我们试图找出新石器时代晚期居住迁移模式的演变和不断变化的农业实践。另一个主要目标是关注旧石器时代的营养水平和食物资源的进化，我们首先试图从巴伐利亚州Sesselfelsgrotte的长序列沉积物中发现的大量动物骨骼中建立90至40 ka BP之间各种气候振荡的同位素基线。在另一项研究中，研究人员的目标是通过对在欧洲中部许多年代确定的晚更新世猎人营地发现的骨头的同位素分析，推断出被猎杀动物——尤其是驯鹿和马——的活动。