We report on the changing radiolarian faunas from the Younger Dryas (ca.12.9 calibrated thousands of years BP [cal. Ky BP]) and into the Holocene (ca. 10.3 cal. Ky BP) in the core JM99-1200 from Andfjorden, northern Norway. Temperature reconstructions using both the Q-mode factor analysis and modern analogue technique methods show stable, cold temperatures below ca. 410 cm core depth, followed by abrupt warming into a relatively stable Holocene temperature regime. Age-depth modelling with three different methods gives an age of ca. 11.9–12.0 cal. Ky BP at this core depth, clearly older than the Younger Dryas–Holocene transition at ca. 11.65 cal. Ky BP according to ice core chronology. Considering that the age models may be insufficiently informed in an interval without radiometric dates, it is possible that the base of the Holocene is indeed at 410 cm, as indicated by the radiolarian and other core data. Such a change in the chronology would have implications for previously published work on the JM99-1200 core. Alternatively, the abrupt warming in Andfjorden predated the Younger Dryas–Holocene transition by a few hundred years. A distinct cold pulse at ca. 315–335 cm, or 11.4–11.5 cal. Ky BP is interpreted as the Preboreal Oscillation. The Preboreal Oscillation has not previously been detected in temperature curves based on planktic foraminifera in the same core, indicating that Radiolaria may be a more sensitive temperature indicator in this region.

中文翻译：

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挪威北部 Andfjorden 的 Younger Dryas-Holocene 过渡期间的放射虫动物群

我们报告了来自北部 Andfjorden 的 JM99-1200 核心 JM99-1200 中来自 Younger Dryas（约 12.9 校准数千年 BP [cal. Ky BP]）和全新世（约 10.3 cal. Ky BP）的放射虫动物群的变化挪威。使用 Q 模式因子分析和现代模拟技术方法进行的温度重建显示稳定的低温温度低于约 410 厘米的核心深度，随后突然变暖进入相对稳定的全新世温度状态。使用三种不同方法的年龄深度建模给出了大约的年龄。11.9–12.0 卡路里 在这个核心深度的 Ky BP，显然比约 11.65 卡路里 Ky BP 根据冰芯年表。考虑到年龄模型在没有辐射测量日期的区间内可能无法得到充分信息，正如放射虫和其他核心数据所表明的那样，全新世的底部可能确实在 410 厘米处。年表的这种变化将对之前发表的 JM99-1200 核心工作产生影响。或者，Andfjorden 的突然变暖比新仙女木-全新世过渡早了几百年。在大约一个明显的冷脉冲。315–335 厘米，或 11.4–11.5 卡。Ky BP 被解释为 Preboreal Oscillation。之前在同一核心中基于浮游有孔虫的温度曲线中未检测到 Preboreal Oscillation，这表明放射虫可能是该地区更敏感的温度指标。Andfjorden 的突然变暖比新仙女木-全新世过渡早了几百年。在大约一个明显的冷脉冲。315–335 厘米，或 11.4–11.5 卡路里。Ky BP 被解释为 Preboreal Oscillation。之前在同一核心中基于浮游有孔虫的温度曲线中未检测到 Preboreal Oscillation，这表明放射虫可能是该地区更敏感的温度指标。Andfjorden 的突然变暖比新仙女木-全新世过渡早了几百年。在大约一个明显的冷脉冲。315–335 厘米，或 11.4–11.5 卡路里。Ky BP 被解释为 Preboreal Oscillation。之前在同一核心中基于浮游有孔虫的温度曲线中未检测到 Preboreal Oscillation，这表明放射虫可能是该地区更敏感的温度指标。