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

在DFG项目中，测定了泥炭沼泽内和不同地区泥炭沼泽间活泥炭苔藓（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速率有很大的影响。Pb同位素结果与其他档案的结果吻合较好。在此基础上，我们希望确定近150年来泥炭沼泽大气痕量金属沉积以及Pb和Os同位素组成的时空变化。为此，将对北部黑森林沼泽（Wildseemoor）的5个1米深的泥炭柱进行分析研究，确定年代（最古老的泥炭层为14C，上部60厘米（约150年）为210Pb，最年轻的泥炭层（近50年）为14C弹脉冲），并对金属随时间的积累速率进行比较。一个主要目标是找出这五个泥炭岩心在多大程度上代表了整个泥炭沼泽的大气沉积，以及是否可能较少的泥炭岩心就足以可靠地重建大气沉积。进一步的目标将是将金属积累速率与Pb和Os同位素联系起来，并优化该方法，以便将存档泥炭沼泽用于其他示踪剂，而不是目前已建立的示踪剂。此外，泥炭沼泽中Os沉积的发现有助于提高我们对PGE元素全循环的认识。利用过去40年的数据，可以将催化转化器的重要性与其他o源进行比较。整个项目将在接下来的时间里分成两个项目。首先，我们只想分析和研究两个泥炭岩心。解释的重点将放在Pb和Os随时间的比较上。

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.