Abstract
In the present work we consider the abundance of radiocarbon (Δ14C) in the Earth’s atmosphere in 12000-8500 BC years. Some periods of sharp cold and warming are fixed in this time interval. The so-called Younger Dryas (≈ 10700–9700 BC) is one of the most well known examples of dramatic change of terrestrial climate. The Younger Dryas (≈ 10700–9700 BC) lasted for ca one thousand years and a transition from the Last Glaciation to the interglacial Holocene has happened about 12 thousand years ago. During the Younger Dryas the amount of Δ14C increased within ≈ 10800 –10560 BC by 3% and it decreased by 6 % over a period 10560-9680BC. The reconstructions of the radiocarbon production rate and the heliospheric modulation potential based on 14C and 18O data sets are presents. The periods of extreme levels of these parameters are determined.
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