Possible influence of climate factors on the reconstruction of the cosmogenic isotope C-14 production rate in the earth's atmosphere and solar activity in past epochs

摘要

The paper considers the probable influence of variations of the global temperature and carbon dioxide concentration in the Earth's atmosphere on the results of reconstruction of the production rate of the cosmogenic isotope C-14 in the terrestrial atmosphere for the period from the early 15th to the mid 19th century. This time interval covers the Sporer, Maunder, and Dalton minima of solar activity, as well as the Little Ice Age. It was shown that the climate changes that occurred during the Little Ice Age should be taken into account. In the Maunder and Sporer minima of solar activity, the C-14 generation rate may be comparable to the values for the Dalton minimum, while exclusion of the climate effect yields extremely large values of the C-14 production rate for these grand minima. In the solar activity reconstruction for past epochs, this circumstance should be taken into consideration via measurements of the C-14 concentration on a long time scale.