| 14C测年与示踪用于研究四万年来的全球变化 |
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| 引用本文： | 陈铁梅.14C测年与示踪用于研究四万年来的全球变化[J].第四纪研究,1990,10(2):181-187. |
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| 作者姓名： | 陈铁梅 |
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| 作者单位： | 北京大学考古系 |
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| 摘 要： | 14C测年方法由于其假设前提经受过严格的检验,测年精确度极高,在全新世范围可达±50年。因此,在建立晚更新世以来的气候年表、各种地层年表、史前考古年表以及研究晚更新世以来的地壳运动、地貌及植被变化等方面起了重要作用。作为示踪剂14C与树木年轮相配合,揭示了近万年来地球磁场,太阳活动与全球气候变化的变化规律,以及它们间的相关关系。
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| 关 键 词： | 晚更新世及全新世 全球变化 14C地质计时器 环境示踪剂 |
RADIOCARBON AND GLOBAL CHANGE |
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| Institution: | Department of Archaeology, Peking University |
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| Abstract: | The nuclide radiocarbon is widely used as geological timer and tracer in study of the global change.Radiocarbon dating had a reputation for its high reliability and accuracy. The uncertainties in dating of the Holocene samples can be confined to ±50 a, because the basic assumptions lying on the basis of this method has been well proved. Carbon is an element which widely and actively takes part in geological and biological processes, a great variety of samplesubstances can be dated with this methods. Therefore, radiocarbon datings serve as the most important time-marks for establishing the chronology of global changes since the Late Pleistocene, including climatic, stratigraphical, geomorphological, tectonical, as well as anthropological and cultural changes.Radiocarbon measurment of dendrologically-dated tree-rings reveals high correlation between radiocarbon concentration, ring-width, climate and solar activity, which provides unique information about the solar variation and solar-terrestrial relationship in the past and helps to predict the global climate change in the future. The radiocarbon generated from nuclear tests during the early 1960s works as the most effective spike to trace the global carbon, circulation, the atmospheric and oceanic flow patterns, to determine the exchange rate of CO2 between different carbon reservoirs; The knowledge of these patterns and parameters are extremely important for prediction of the influence of the greenhouse effect on the world climate and ecology. |
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