正如您可能想象的那样,科学家们一直试图在过去的五十年中发现可以安全稳定地过时的有机物。其他有机数据集包括varves,它是每年铺设的沉积岩层,含有有机物质;深海珊瑚,洞穴(洞穴沉积物)和火山喷发岩;但是每种方法都存在问题。洞穴沉积和变化有可能包括旧的土壤碳,并且尚未解决的问题是洋流中14C的波动量。由贝尔法斯特女王大学地理,考古学和古生态学学院气候,环境与年表CHRONO中心的Paula J. Reimer领导的研究联盟,并在Radiocarbon期刊上发表,一直致力于解决这一问题。几十年来,开发一个软件程序,使用越来越大的数据集来校准日期。最新的是IntCal13,它结合并加强了来自树木年轮,冰芯,火山灰,珊瑚,洞穴的数据,以及最近来自日本Suigetsu湖沉积物的数据,为c14提供了显着改进的校准装置日期在12,000到5万年前。据报道,2012年,日本的一个湖泊有可能进一步微调放射性碳测年。 Suigetsu湖每年形成的沉积物保存着过去5万年来环境变化的详细信息,放射性碳专家PJ Reimer说这些信息与格陵兰冰芯一样好,甚至可能更好。研究人员Bronk-Ramsay等。据报道,808个AMS日期基于三个不同放射性碳实验室测量的沉积物变化。日期和相应的环境变化有望在其他关键气候记录之间建立直接关联,允许Reimer等研究人员将放射性碳日期精确校准在12,500到c14约会52,800的实际极限之间。

英国曼彻斯特考古学论文代写:放射性碳

As you might imagine, scientists have been trying to find organic matter that can be safely and steadily outdated over the past 50 years. Other organic data sets include varves, which are sedimentary rock layers laid each year, containing organic matter; deep-sea corals, caves (cave sediments) and volcanic eruptions; but each method has problems. Cave deposits and changes are likely to include old soil carbon, and the unresolved problem is the amount of 14C fluctuations in ocean currents. A research consortium led by Paula J. Reimer of the CHRONO Center for Climate, Environment and Chronology at the University of Queens, Belfast, and published in the Radiocarbon journal, has been working to solve this problem. For decades, develop a software program that uses an ever-larger data set to calibrate dates. The latest is IntCal13, which combines and enhances data from tree rings, ice cores, volcanic ash, corals, caves, and recent data from sediments in Lake Suigetsu, Japan, providing significantly improved calibration for c14 dated at 12,000 Up to 50,000 years ago. According to reports, in 2012, a lake in Japan is likely to further fine-tune radiocarbon dating. Seigetsu Lake’s annual sediments preserve detailed information on environmental changes over the past 50,000 years, and radiocarbon expert PJ Reimer said the information is as good as the Greenland ice core, and may even be better. Researcher Bronk-Ramsay et al. The 808 AMS dates are reported to be based on sediment changes measured by three different radiocarbon laboratories. Dates and corresponding environmental changes are expected to establish a direct correlation between other key climate records, allowing researchers such as Reimer to accurately calibrate radiocarbon dates between the actual limits of 12,500 to c14 appointments of 52,800.

发表评论

电子邮件地址不会被公开。 必填项已用*标注