Radiocarbon calibration is necessary to correct for variations in atmospheric radiocarbon over time. The IntCal working group has developed an updated and extended radiocarbon calibration curve, IntCal20, for Northern Hemisphere terrestrial samples from 0 to 55,000 cal yr BP. This paper summarizes the new datasets, changes to existing datasets, and the statistical method used for constructing the new curve. Examples of the effect of the new calibration curve compared to IntCal13 for hypothetical radiocarbon ages are given. For the recent Holocene the effect is minimal, but for older radiocarbon ages the shift in calibrated ages can be up to several hundred years with the potential for multiple calibrated age ranges in periods with higher-resolution data. In addition, the IntCal20 curve is used to recalibrate the radiocarbon ages for the glaciation of the Puget Lowland and to recalculate the advance rate. The ice may have reached its maximum position a few hundred years earlier using the new calibration curve; the calculated advance rate is virtually unchanged from the prior estimate.

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IntCal20 放射性碳校准曲线的组成和后果

放射性碳校准对于校正大气放射性碳随时间的变化是必要的。IntCal 工作组为北半球 0 至 55,000 cal yr BP 的陆地样品开发了更新和扩展的放射性碳校准曲线 IntCal20。本文总结了新数据集、现有数据集的变化以及用于构建新曲线的统计方法。给出了新校准曲线与 IntCal13 相比对假设放射性碳年龄的影响的示例。对于最近的全新世，影响很小，但对于较旧的放射性碳年龄，校准年龄的变化可能高达数百年，在具有更高分辨率数据的时期内可能会有多个校准年龄范围。此外，IntCal20 曲线用于重新校准普吉特低地冰川作用的放射性碳年龄，并重新计算推进率。使用新的校准曲线，冰可能在几百年前就已经到达了它的最大位置；计算出的预付率与先前的估计几乎没有变化。