FP 14: Dendrochronology, 14C time-scale and mechanisms of rapid climate change during the last deglaciation

我们建议以树木年轮年代学为基础，为消冰期和晚冰期建立一个具有年分辨率和精度的绝对年代框架。扩展将把已经存在的，但漂浮的晚冰期松树年表与霍恩海姆树木年轮实验室的绝对年代年表联系起来，使用已经填补空白的单个部分，从已经收集的未确定日期的松树部分，以及广泛的新实地调查，主要是在欧洲东南部和南部。高精度……对年代际样品的14C分析将把陆地14C校准扩展到这个关键的时间间隔，从而为重要的气候档案提供一个以14C为日期的共同时间框架。利用14C资料重建了大气14C水平的波动，得到了太阳变率和海洋通风变化的信息。为了分离太阳强迫、地磁强迫和海洋强迫，我们使用冰芯的10Be数据和地磁强度数据，这些数据是在相关和正在进行的项目中获得的。由于14C和10Be的波动有一个共同的原因……我们可以将树木年轮的时间尺度转移到冰芯上，这将大大提高冰芯作为气候档案的潜力。利用已建立的消冰期和晚冰期的气候信息。

We propose to create an absolutely dated time frame, of annual resolution and accuracy, for the deglaciation and Late Glacial interval, based on dendrochronologically dated tree-ring chronologies. The extension will come from linking already existing, but floating, Late Glacial pine chronologies to the absolutely dated chronologies of the Hohenheim tree-ring laboratory, using individual sections already filling the gaps, from undated pine sections already collected, and extensive new fieldwork, predoinantly in South-eastern and Soutern Europe. High-precision... 14C analyses of decadal samples will extend the terrestrial 14C calibration into this crucial time interval, leading to a common time frame for important climate archives, dated by 14C. From the 14C data the fluctuations of the atmospheric 14C level is reconstructed, yielding information of solar variability and ocean ventilation changes. To separate solar, geomagnetic and oceanic forcing we use 10Be data from ice cores and geomagnetic intensity data, obtained in associated and ongoing projects. As 14C and 10Be fluctuations share a common cause... we can transfer the tree-ring time scale to ice-cores which will improve substantially the potential of ice cores as climate archives. Using well established climate information for the deglaciation and Late Glacial period.