Cornell Tree Ring Laboratory, Department of Classics, Cornell University, Ithaca, NY, 14853, USA.
Laboratory for Ion Beam Physics, Swiss Federal Institute of Technology in Zurich, 8093, Zurich, Switzerland.
Sci Rep. 2020 Aug 17;10(1):13785. doi: 10.1038/s41598-020-69287-2.
The new IntCal20 radiocarbon record continues decades of successful practice by employing one calibration curve as an approximation for different regions across the hemisphere. Here we investigate three radiocarbon time-series of archaeological and historical importance from the Mediterranean-Anatolian region, which indicate, or may include, offsets from IntCal20 (~0-22 C years). While modest, these differences are critical for our precise understanding of historical and environmental events across the Mediterranean Basin and Near East. Offsets towards older radiocarbon ages in Mediterranean-Anatolian wood can be explained by a divergence between high-resolution radiocarbon dates from the recent generation of accelerator mass spectrometry (AMS) versus dates from previous technologies, such as low-level gas proportional counting (LLGPC) and liquid scintillation spectrometry (LSS). However, another reason is likely differing growing season lengths and timings, which would affect the seasonal cycle of atmospheric radiocarbon concentrations recorded in different geographic zones. Understanding and correcting these offsets is key to the well-defined calendar placement of a Middle Bronze Age tree-ring chronology. This in turn resolves long-standing debate over Mesopotamian chronology in the earlier second millennium BCE. Last but not least, accurate dating is needed for any further assessment of the societal and environmental impact of the Thera/Santorini volcanic eruption.
新的 IntCal20 放射性碳记录延续了几十年来的成功实践，即采用一条校准曲线来近似整个半球不同地区的数据。在这里，我们研究了来自地中海-安纳托利亚地区的三个具有考古和历史重要性的放射性碳时间序列，这些序列表明（或可能包含）与 IntCal20 的偏差（约 0-22 年）。虽然这些差异很小，但对于我们精确理解地中海盆地和近东地区的历史和环境事件至关重要。地中海-安纳托利亚地区木材中放射性碳年龄较老的偏差可以用新一代加速器质谱（AMS）的高分辨率放射性碳日期与先前技术（如低水平气体正比计数（LLGPC）和液体闪烁光谱法（LSS）的日期之间的差异来解释。然而，另一个原因可能是不同的生长季节长度和时间，这将影响在不同地理区域记录的大气放射性碳浓度的季节性循环。了解和纠正这些偏差是明确确定中青铜时代树木年轮年代学的日历位置的关键。这反过来又解决了在公元前 2000 年早期有关美索不达米亚年代学的长期争论。最后但同样重要的是，准确的日期对于进一步评估锡拉/圣托里尼火山喷发对社会和环境的影响是必要的。
