Radiocarbon, Ocean and Climate Change over the Last Deglaciation

休根，康拉德，和Overpeck， Jonathan T.科罗拉多大学，Boulder末次冰期的放射性碳、海洋和气候变化年代准确、高分辨率的古气候记录为观测末次冰期（一个突变时期）整体气候系统的行为提供了唯一的机会；但由于缺乏可靠的14C与11,800 cal. yr. BP之前时期的日历年龄校准曲线，这些记录的使用受到了阻碍。该奖项支持一个项目，该项目旨在通过整个冰川消融提供3000年的大气和海洋放射性碳校准曲线。该项目将创建一个大气放射性碳校准数据集，该数据集来自最高沉积速率的Cariaco盆地岩心PL07-58PC。这将通过14C样品分辨率（每15-30日历年一个14C日期）与11,800 cal. yr. BP基于树轮的校准记录相比较，扩展到整个冰川消退时期。这将使14C年代和日历年代的古气候记录在世界范围内相互关联，并计算出突发事件期间的准确变化率。该项目还将创建热带大西洋Cariaco盆地和高海拔大西洋Troll 3.1岩芯之间低至高纬度北大西洋表面14C梯度的时间序列，这将作为该地区高纬度14C储层年龄变化的记录，并提供将高纬度北大西洋古气候记录与其低纬度等效记录和陆地记录进行比较所需的海洋放射性碳校准数据集。

Abstract ATM-9709563 Hughen, Konrad, and Overpeck, Jonathan T. University of Colorado, Boulder Radiocarbon, Ocean and Climate Change over the Last Deglaciation Well-dated, high-resolution paleoclimate records offer the only opportunity to observe the behavior of the integrated climate system during the last deglacial, a period of abrupt change; but the use of such records is hampered by the lack of a reliable 14C versus calendar-age calibration curve for the period before 11,800 cal. yr. BP. This award supports a project designed to provide a 3000-year extension of the atmospheric and marine radiocarbon calibration curves back through the entire deglaciation. The project will create an atmospheric radiocarbon calibration data set from the highest deposition-rate, annually-laminated Cariaco Basin core PL07-58PC. This will extend through the entire period of deglaciation with 14C sample resolution (one 14C date per 15-30 calendar years) comparable to that of the 11,800 cal. yr. BP tree-ring-based calibration record. This will allow the correlation of 14C- and calendar age-dated paleoclimate records around the world, as well as calculation of accurate rates of change during abrupt events. This project will also create a time series of the low- to high-latitude surface North Atlantic 14C gradient between the tropical Atlantic Cariaco Basin and high-altitude Atlantic Troll 3.1 cores that will serve as a record of high-latitude 14C reservoir age variations in this region and provide the marine radiocarbon calibration data set needed to compare high-latitude North Atlantic paleoclimate records to their low-latitude equivalents and to terrestrial records.