NSF Arizona Accelerator Mass Spectrometry Facility: Operations and Research Applications

小行星9730699 这笔赠款为亚利桑那大学加速器质谱仪（AMS）设施的运营和维护预算提供了额外的三年部分支持。 亚利桑那州AMS实验室自1981年以来一直在持续的NSF资助下运行，旨在支持亚利桑那州AMS工作人员进行的前沿内部研究和技术开发，并主要为NSF资助的PI提供放射性碳（14 C）测年服务。该实验室目前每年分析超过3，500个样品的14 C含量，其中约19%用于内部研究。 该设施不仅支持地球科学家的需求，还支持海洋学家、冰川学家、水文地质学家、考古学家、行星科学家和大气科学家的需求。 依赖亚利桑那AMS分析的研究实例包括：南极冰盖动态和智利中纬度安第斯山脉山地冰川动态的古气候学研究;古地震学研究;美洲古印第安人定居时间的考古研究;根据珊瑚骨骼中记录的14 C/13 C特征对上层水柱动态进行大气和海洋学研究;耦合14 C和U/Th测年的珊瑚和洞穴沉积物，以扩大大气放射性碳校准超过目前的树木年代学限制约。11.5 ka;使用14 C作为地下水中溶解的有机碳和无机碳池的示踪剂;以及14 C调查陨石和推断的火星陨石中碳的起源。 此外，该实验室还培养了各种各样的本科生，研究生和博士后学生，他们从事利用AMS技术的物理，化学和地球科学研究项目。 由于该设施支持的科学领域范围广泛，NSF的持续支持由地球科学/仪器和设施计划部门，极地计划办公室内的计划和SBER/考古计划共享。 ***

9730699 Donahue This grant provides an additional three years partial support of the operations and maintenance budget for the University of Arizona accelerator mass spectrometry (AMS) facility. The Arizona AMS lab has been in operation since 1981 under continuous NSF funding with the intentions of supporting the frontier in- house research and technique development conducted by the Arizona AMS staff and to provide radiocarbon (14C) dating services primarily for NSF-funded PI's. The lab presently analyzes the 14C content of over 3,500 samples per year of which about 19% were for in-house research. This facility supports the needs of not just Earth scientists, but also, oceanographers, glaciologists, hydrogeologists, archaeologists, planetary scientists and atmospheric scientists. Examples of research that have relied on Arizona AMS analyses include: paleoclimatological studies of ice sheet dynamics in Antarctica and mountain glacier dynamics in the mid-latitude Chilean Andes; studies in paleoseismology; archaeological studies of the timing of Paleoindian settlements in the Americas; atmospheric and oceanographic studies of upper water column dynamics based on the 14C/13C signatures recorded in coralline skeletons; coupled 14C and U/Th dating of corals and speleothems to extend atmospheric radiocarbon calibration beyond the present dendrochronologic limit of ca. 11.5 ka; the use of 14C as a tracer of the pools of dissolved organic and inorganic carbon pools in groundwater; and 14C investigations of the origin of carbon in chondrites and the inferred Martian meteorites. Furthermore, this lab trains a diverse array of undergraduate, graduate and post-doctoral students engaged in physics, chemistry and geoscience research programs that utilize AMS techniques. Due to the diverse range of scientific fields supported by this facility, continued NSF support is shared by the Division of Earth Sciences/Instrumentation and Facilities Program, programs within the Office of Polar Programs and the SBER/Archaeometry program. ***