A change of natural radiocarbon level in the earth's atmosphere over the past 8000 years as a consequence of solar activity, geomagnetic field and climatic factors:: 2400 - year cycle

摘要

Radiocarbon concentration (#DELTA#~(14)C) data in tree rings over the past 8000 year are analysed. These data represent the ~(14)C concentration in the Earth's atmosphere in the past. The series of #DELTA#~(14)C_D derived from the initial data by elimination of the trend of geomagnetic origin are studied. It is shown that the amplitude of #DELTA#~(14)C fluctuations is changed on the everage with the 2400 year period and the basic contribution to the long-term radiocarbon concentration variations brings about 2400-year period also. The epochs of high and low amplitude of #DELTA#~(14)C_D changes resolved. It is shown that extreme of the epoch of the high amplitude coincide in time with maxima of the long-term variations radiocarbon concentrations. The interpretation obtained results is given as combinatorial influence of the solar activity and climatic factors.