Early Holocene Dendrochronology and Calibration of 14C Dating

树木年轮研究实验室的树木年代学家， 亚利桑那大学，建立了连续的刺果核 加州东部一个地方的松树年轮年表 从现在到公元前6700年， 树木已被用于校准放射性碳时间尺度， 公元前6450年。 将尝试 连接树木年轮年表的不连续部分， 可以追溯到公元前9500年或者说，整个全新世， 冰河时代晚期 早于公元前6450年的样本将被 用于进一步的放射性碳校准在NSF大学 亚利桑那加速器质谱仪设施。 这一点 这是一个相当大的科学兴趣，因为这个数据集是唯一的 一个现在和一段时间内， 独立核查类似放射性碳的决议 校准基于欧洲橡木和松木。 的时间交叠 橡树和松树之间的联系并不是基于年轮交叉， 年代测定，但在8750附近的放射性碳活动的匹配模式 B.P.现在手头上的几个狐尾松系列是14 C日期， 全新世早期 其中一个似乎很有可能 验证放射性碳活动的模式依赖于 欧洲工作。 这项跨学科的工作很重要，因为它 允许新的水平的准确性，在测量率的 在许多全球环境过程中的变化。 木材本身， 通过其他类型的分析，可以提供关于 气候和其他气候变化的性质和范围 环境参数。

Dendrochronologists at the Laboratory of Tree-Ring Research, University of Arizona, have established a continuous bristlecone pine tree-ring chronology from one locality in eastern California that reaches from the present back to 6700 B.C. Wood from the trees has been used to calibrate the radiocarbon time scale in calendrical years back to 6450 B.C. An attempt will be made to connect discontinuous segments of the tree-ring chronology that now reach back to about 9500 B.C., or, through the entire Holocene into Late Glacial times. Samples dating earlier than 6450 B.C. will be used for further radiocarbon calibration at the NSF-University of Arizona Accelerator Mass Spectrometer facility. This is of considerable scientific interest because this data set is the only one that might now, and for some time, provide truly annual resolution for independent verification of a similar radiocarbon calibration based on European oak and pine. The temporal overlap between the oak and pine is not however based on tree-ring cross- dating, but on matching patterns of radiocarbon activity near 8750 B.P. Several bristlecone pine series now in hand are 14C dated to the early Holocene. One appears to have high potential for verifying the pattern of radiocarbon activity relied upon in the European work. This interdisciplinary work is important because it permits new levels of accuracy in measurement of the rates of change in many global environmental processes. The wood itself, through other kinds of analyses, can provide new information on the nature and range of variation in climatic and other environmental parameters.