Radiocarbon data from North Atlantic marine sediments directly linked to millennial-scale climate variability through the last glacial period

来自海洋事件地层的浮游有孔虫提供了唯一实用的方法来获得过去海洋表面14C的记录，该记录跨越了放射性碳法0-50ka的整个范围。这些数据被包括在最新的放射性碳校准IntCal09中，因为它们大大扩展了目前有限的树木年代学记录范围，尽管它们不是严格意义上的校准档案，而且海洋表面经历了大的储集年龄随时间的变化。放射性碳校准国际工作组警告说，目前校准中假定的恒定水库效应存在局限性，并认识到迫切需要适当的数据集来量化水库年龄的时间变化，以便提高许多基于放射性碳的海洋年表和模型的准确性和精度。放射性碳储层年龄的时间变化进一步提供了海洋环流模式的定量信息。本提案的目的是为来自中纬度东北大西洋的MD04-2822和MD95-2006高分辨率海洋岩心建立14C地层，以限制表征末次冰期特征的冷（静）和暖（静间）D-O振荡之间的14C年龄差异。我们将在25-50 ka区间进行详细的14C分析，提供第一个复制的中纬度海洋14C数据，用于放射性碳校准和海洋放射性碳储层年龄效应的量化重建，受基于事件的地层学和年代学的限制。

Planktonic foraminifera from well-constrained marine event-stratigraphies, provide the only practical means of achieving a record of past surface ocean 14C that spans the entire range of the radiocarbon method 0-50ka. Such data are included in the most recent radiocarbon calibration IntCal09 because they significantly extend the currently limited range of dendrochronologically dated records, despite the fact that they are not strictly bona fide calibration archives and that the surface ocean experiences large reservoir age changes over time. The international working group on radiocarbon calibration warns about the limitations of the assumption of constant reservoir effect in the current calibration and recognises that suitable data sets with which to quantify temporal variations in reservoir ages are urgently needed so that the accuracy and precision of the many radiocarbon based marine chronologies and models can be improved. The temporal shifts in radiocarbon reservoir ages have furthermore provided quantitative information about ocean circulation patterns. The aim of this proposal is to establish a 14C stratigraphy for high-resolution marine cores MD04-2822 and MD95-2006 from the mid-latitude NE Atlantic, in order to constrain the 14C age-differences between cold (stadial) and warm (interstadial) D-O oscillations which characterised the last glacial period. We will undertake detailed 14C analysis in the interval 25-50 ka, providing the first replicated mid-latitude marine 14C data for radiocarbon calibration and a quantified reconstruction of marine radiocarbon reservoir age effect, constrained by event-based stratigraphies and tephrochronology.