AMS Dating of Arctic Lake Sediments

该奖项支持对一系列北极湖泊沉积物的研究 核心在一个程序中，以确定获得的最佳方法， C-14的可靠数据。 古气候记录 湖泊沉积物对气候变化有着非常完整的记录; 因此，这些样本对于研究 在过去的一千年里， 千年。 早期的研究表明放射性碳 湖泊沉积物的年代测定可能是有问题的，因为 化石碳和再加工碳的结合， 水生植物和生物溶解碳酸盐。 这个项目 是一项协调努力，结合了INSTAAR的专业知识， 科罗拉多大学的一个小组与AMS的一个小组合作 亚利桑那大学放射性碳测年实验室 这 研究计划的重点是从一个 沉积物的各种物理和化学分离物， 一系列湖芯的深度函数， “可靠”和“有问题”的日期。 该项目将使 制定程序，以便为《公约》编制更可靠的日期， 北极湖泊沉积物研究的预期增加。

This award supports the study of a series of Arctic lake-sediment cores in a program to ascertain the best methods of obtaining reliable C-14 dates on such material. The paleoclimate record in lake sediments gives a very complete record of climatic change; these samples, therefore, are critical for the study of changes which have occurred over the last millennium, and tens of millennia. Earlier studies have demonstrated that radiocarbon dating of lake sediments can be problematic, due to the incorporation of fossil and reworked carbon, and uptake of dissolved carbonate by aquatic plants and organisms. This project is a coordinated effort combining the expertise of the INSTAAR group at the University of Colorado with that of the AMS radiocarbon dating laboratory at University Arizona. This research program would focus on extracting C-14 information from a variety of physical and chemical separates of sediment as a function of depth in a series of lake cores showing both "reliable" and "problematic" dates. This project will allow the development of procedures to produce more reliable dates for the expected increase in the study of Arctic lake sediment.