Abstract
The possible application of temperature reconstructions based on measurement of the 40Ar concentration in ice layers of the Greenland ice sheet to study past solar activity with radiocarbon data is considered. The rate of 14С production and the heliosphere modulation potential from the 2nd millennium B.C. to the middle of the 18th century A.D. is reconstructed with allowance for the Earth’s climate variation. The temperature reconstruction based on the 40Ar content in the annual ice layers of Greenland revealed two global minima of solar activity with duration of ~200 years during the cold Sub-Atlantic period, which lasted on the Earth from 900 B.C. to 300 B.C. This suggests that solar-activity variation can influence climate change.
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Funding
The paper was partially supported by the Russian Foundation for Basic Research, projects nos. 18-02-00583 and 19-02-00088. Yu.A. Nagovitsyn thanks the Ministry of Science and Higher Education of the Russian Federation (grant no. 075-15-2020-780) also.
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Dergachev, V.A., Kudryavtsev, I.V. & Nagovitsyn, Y.A. Periods of Extremely High Rates of the Production of Cosmogenic 14C and Temperature Variation According to Data on the 40Ar Content in the Ice Layers for the Last 4000 Years. Geomagn. Aeron. 60, 835–839 (2020). https://doi.org/10.1134/S0016793220070105
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DOI: https://doi.org/10.1134/S0016793220070105