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

摘要99-85855WiederRUI：最近积累的泥炭的高精度、精细尺度深度分辨率测年：技术的交叉验证和新方法的开发北方和亚北极泥炭地生态系统包含世界土壤碳的1/3，代表大气二氧化碳的净汇，并且位于预计未来气候明显的地区。 预测泥炭地对气候变化的碳循环反应需要模型。 这项研究的研究人员开发了一个模型，该模型依赖于泥炭岩芯的年代测定，从表面向下以 2 厘米为增量。 测年方法适用于 150 岁以下的泥炭（210Pb 测年）和 300 岁以上的泥炭（14C 测年）。 研究人员提出了一种新的测年方法，该方法基于天然存在的铍和铝放射性同位素（10Be 和 26Al）的大气沉积，可以弥补目前 150 到 300 年之间的差距。在继续采用这种新方法之前，至关重要的是要证明大气沉积的 10Be 和 26Al 的稳定性。 在这项研究中，研究人员将在实验性、操作性实验室研究中专门测试移动/不动问题。

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.