RUI: High-precision, Fine-scale Depth Resolution Dating of Recently Accumulated Sphagnum Peat: Cross-Corroboration of Techniques and Development of a Novel Approach

高精度，精细尺度深度分辨率测定最近积累的泥炭藓泥炭年代：技术的交叉验证和新方法的发展北方和亚北极泥炭地生态系统含有世界土壤碳的1/3，代表大气CO2的净汇，并且位于未来气候预计明显的地区。 预测泥炭地对气候变化的碳循环响应需要模型。 这项研究中的调查人员已经开发出一种模型，该模型依赖于从表面向下以2厘米为增量的泥炭芯测年。 年龄小于150岁的泥炭（210 Pb测年）和年龄大于300岁的泥炭（14 C测年）的测年方法可用。 研究人员提出了一种新的测年方法，以弥补目前150至300年之间的差距，该方法基于铍和铝（10 Be和26 Al）的天然放射性同位素的大气沉积。在使用这种新方法之前，必须证明大气沉积的10 Be和26 Al的不迁移性。 在这项研究中，研究人员将在实验性的、操作性的实验室研究中专门测试移动性/不移动性问题。

Abstract99-85855WiederRUI: High-precision, Fine-scale Depth Resolution Dating of Recently Accumulated Sphagnum Peat: Cross-Corroboration of Techniques and Development of a Novel ApproachBoreal and subarctic peatland ecosystems contain 1/3 of the world's soil carbon, represent a net sink for atmospheric CO2, and are located in regions where future climatic is expected to be pronounced. Predicting the carbon cycling response of peatlands to changing climate requires models. The investigators in this study have developed a model that relies on dating of peat cores in 2-cm increments from the surface downward. Dating methods are available for peat younger than 150 years old (210Pb-dating) and older than 300 years old (14C-dating). The researchers have proposed a new dating method to cover the present gap between 150 and 300 years, based on atmospheric deposition of naturally occurring radioisotopes of beryllium and aluminum (10Be and 26Al). Before proceeding with this new method, it is critical that the immobility of atmospherically deposited 10Be and 26Al be demonstrated. In this research, the investigators will specifically test the mobility/immobility question in an experimental, manipulative laboratory study.