RADIOCARBON AND GLOBAL CHANGE
14C测年与示踪用于研究四万年来的全球变化

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.