Beyond ~13.9 cal kBP, the IntCal20 radiocarbon (14C) calibration curve is based upon combining data across a range of different archives including corals and planktic foraminifera. In order to reliably incorporate such marine data into an atmospheric curve, we need to resolve these records into their constituent atmospheric signal and marine reservoir age. We present results of marine reservoir age simulations enabling this resolution, applying the LSG ocean general circulation model forced with various climatic background conditions and with atmospheric radiocarbon changes according to the Hulu Cave speleothem record. Simulating the spatiotemporal evolution of reservoir ages between 54,000 and 10,700 cal BP, we find reservoir ages between 500 and 1400 yr in the low- and mid-latitudes, but also more than 3000 yr in the polar seas. Our results are broadly in agreement with available marine radiocarbon reconstructions, with the caveat that continental margins, marginal seas, or tropical lagoons are not properly resolved in our coarse-resolution model.

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关于 IntCal20 中使用的海洋储层年龄模拟的简短说明

超过 ~13.9 cal kBP，IntCal20 放射性碳 (14C) 校准曲线是基于结合一系列不同档案的数据，包括珊瑚和浮游有孔虫。为了将这些海洋数据可靠地纳入大气曲线，我们需要将这些记录解析为它们的组成大气信号和海洋储层年龄。我们根据 Hulu Cave speleothem 记录应用受各种气候背景条件和大气放射性碳变化强制的 LSG 海洋大环流模型，提供了实现该分辨率的海洋储层年龄模拟结果。通过模拟 54,000 到 10,700 cal BP 之间的储层年龄的时空演化，我们发现中低纬度地区的储层年龄在 500 到 1400 年之间，在极地海域也超过 3000 年。