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

北大西洋海洋沉积物的放射性碳数据与末次冰河期的千年尺度气候变化直接相关

基本信息

批准号：
NE/I017801/1
负责人：
William Edward Newns Austin
金额：
$ 6.68万
依托单位：
University of St Andrews
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2011
资助国家：
英国
起止时间：
2011 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FI017801%2F1
关键词：
Radiocarbon data North Atlantic marine

项目摘要

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.

来自约束良好的海洋事件地层学的浮游有孔虫，提供了唯一实用的手段，实现了过去的海洋表层14 C的记录，跨越整个范围的放射性碳方法0- 50 ka。这些数据被包括在最新的放射性碳校准IntCal 09中，因为它们显着扩展了目前有限的树木年代学记录范围，尽管它们不是严格真实的校准档案，并且随着时间的推移，表层海洋经历了巨大的水库年龄变化。国际放射性碳校准工作组警告说，在目前的校准中，恒定的水库效应假设存在局限性，并认识到迫切需要合适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确性。放射性碳储层年龄的时间变化还提供了有关海洋环流模式的定量信息。本建议的目的是建立一个高分辨率的海洋岩心MD 04 -2822和MD 95 -2006从中纬度东北大西洋的14 C地层，以限制冷（stadial）和温暖（interstadial）的D-O振荡，其特征是末次冰期之间的14 C年龄差异。我们将在25-50 ka的时间段进行详细的14 C分析，提供第一个复制的中纬度海洋14 C数据的放射性碳校准和定量重建海洋放射性碳储层年龄效应，约束基于事件的地层学和火山灰年代学。