150 years of trace metal, Pb- and Os-isotope deposition to the Wildseemoor and its spatial variation

维尔德西莫尔 150 年来的痕量金属、铅和锇同位素沉积及其空间变化

• 批准号: 261995436
• 负责人: Dr. Michael Brauns
• 金额: --
• 依托单位: Department of Renewable Resources
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/261995436?language=en
• 关键词: 150; years; trace; metal; Pb

During the DFG project, variation of various trace metals and Pb isotopes in living Sphagnum mosses (peat bog surface) within a peat bog and between peat bogs of different regions was determined. The annual production of the living mosses, thereby, had a strong impact on the calculated accumulation rate. Pb isotope results were in good agreement with results from other archives. Based on this, we want to determine the temporal and spatial variation of atmospheric trace metal deposition as well as Pb- and Os isotope composition within a peat bog for the last 150 years. To do that five 1m deep peat columns of a northern black forest bog (Wildseemoor) will be analytically studied, dated (14C for the oldest peat layers, 210Pb for the upper 60 cm (around 150 years) and 14C bomb-pulse for the youngest peat layers (last 50 years)) and metal accumulation rates through time will be compared with each other. A main goal is to find out how well these five peat cores represent the atmospheric deposition into the whole peat bog and whether possibly less peat cores are sufficient to reconstruct atmospheric deposition reliably. Further goals will be to connect metal accumulation rates with Pb and Os isotopes as well as to optimize this method for using the archive peat bog for other tracers than the up to now well established. Moreover findings of Os deposition into peat bogs can help to improve our understanding about the whole cycle of PGE elements. Using the data of the last 40 years, the importance of catalytic converters can be compared to other Os sources. The whole project will be split into two projects following in time. First we want to analyze and study only two peat cores. The stress in interpretation will be on the comparison of Pb and Os versus time.

在DFG项目期间，测定了泥炭沼泽内和不同地区泥炭沼泽之间活泥炭藓（泥炭沼泽表面）中各种微量金属和铅同位素的变化。因此，活苔藓的年产量对计算的积累率有很大影响。铅同位素结果与其他档案的结果吻合较好。在此基础上，我们要确定的时间和空间变化的大气微量金属沉积以及铅和锇同位素组成的泥炭沼泽在过去的150年。为此，将对北方黑森林沼泽（Wildsemoor）的5个1米深的泥炭柱进行分析研究，并测定其年代（最古老的泥炭层为14 C，上部60 cm（约150年）为210 Pb，最年轻的泥炭层为14 C炸弹脉冲（过去50年）），并将通过时间对金属积累率进行相互比较。一个主要的目标是找出如何以及这五个泥炭芯代表大气沉积到整个泥炭沼泽和是否可能更少的泥炭芯是足以可靠地重建大气沉积。进一步的目标将是连接金属的积累率与铅和锇同位素，以及优化这种方法使用档案泥炭沼泽的其他示踪剂比到目前为止建立。此外，锇在泥炭沼泽中沉积的研究有助于加深对PGE元素整个循环的认识。使用过去40年的数据，催化转化器的重要性可以与其他Os来源进行比较。整个项目将分为两个项目，随后在时间。首先，我们只想分析和研究两个泥炭芯。解释的重点将放在Pb和Os随时间的对比上。