Abstract

In this paper, the climate effect on the atmospheric radiocarbon concentration is estimated using the data, derived by using dendrochronologically dated tree ring samples, on sunspot number and global surface temperature during 1650–1800 A.D.; however, in order to use the data as a record of changes in radiocarbon production rate or cosmic ray intensity, the variations due to the geochemical process must be eliminated. The estimated influence of climate on the atmospheric radiocarbon concentration is 3–5 times greater than the direct contribution of the change of radiocarbon concentration through a Maunder minimum. The influence of climate on the atmospheric radiocarbon concentration through a transfer rate of CO 2 between atmosphere and ocean was estimated at a rate of −13% per degree. The elimination of variations caused by climate and sunspot activities from the variations in atmospheric radiocarbon concentration gives a long time scale trend having a minimum and maximum which occur in about the seventh century A.D. and the sixth millennium suggesting a good correlation between this trend of variation and paleogeomagnetic data.

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