Recognition of marine reservoir effect (MRE) spatial and temporal variability must be accounted for in any radiocarbon-based paleoclimate, geomorphological, or archaeological reconstruction in a coastal setting. ΔR values from 37 shell-wood pairs across southern Southeast Alaska provide a robust local evaluation of the MRE, reporting a local Early Holocene weighted ΔR average of 265 ± 205, with a significantly higher ΔR average of 410 ± 60 for samples near limestone karst. Integration with our synthesis of extant MRE calibrations for the Northwest Coast of North America suggests that despite local variability, regional ΔR averages echo proxies for coastal upwelling: regional weighted averages were at their highest in the Bølling-Allerød interstade (575 ± 165) and their lowest in the Younger Dryas stade (−55 ± 110). Weighted ΔR averages across the Northwest Coast rose to a Holocene high during the Early Holocene warm period (245 ± 200) before settling into a stable Holocene average ΔR of 145 ± 165, which persisted until the late Holocene. Our quantification of local and regional shifts in the MRE shines a light on present methodological issues involved in MRE corrections in mixed-feeder, diet-based calibrations of archaeological and paleontological specimens.

中文翻译：

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量化北美西北海岸的海洋储层效应变异性

在沿海环境中的任何基于放射性碳的古气候、地貌或考古重建中，都必须考虑对海洋储层效应 (MRE) 空间和时间变异性的认识。来自阿拉斯加东南部的 37 个贝壳木材对的 ΔR 值提供了对 MRE 的可靠当地评估，报告称当地早期全新世加权 ΔR 平均值为 265 ± 205，对于石灰岩喀斯特附近的样品，ΔR 平均值显着更高，为 410 ± 60。与我们对北美西北海岸现有 MRE 校准的综合综合表明，尽管存在局部变化，但区域 ΔR 平均值是沿海上升流的回波代理：区域加权平均值在 Bølling-Allerød 间 (575 ± 165) 及其在新仙女木阶段最低（-55 ± 110）。西北海岸的加权 ΔR 平均值在全新世早期暖期 (245 ± 200) 上升到全新世高点，然后稳定到全新世 145 ± 165 的稳定平均值 ΔR，一直持续到全新世晚期。我们对 MRE 局部和区域变化的量化揭示了目前在混合饲养、基于饮食的考古和古生物学标本校准中涉及 MRE 校正的方法学问题。