On the influence of climatic factors on the ratio between the cosmogenic isotope 14C and total carbon in the atmosphere in the past
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Ioffe Physical-Technical Institute of the Russian Academy of Sciences, St-Petersburg, 26 Politekhnicheskaya, St. Petersburg, 194021, Russia
Central (Pulkovo) Astronomical Observatory of the Russian Academy of Sciences, St-Petersburg, Pulkovskoye chaussee 65, 196140, Russia
University of Helsinki, P O Box 64, Fin 00014, Helsinki, Finland
Online publication date: 2014-06-22
Publication date: 2014-09-01
Geochronometria 2014;41(3):216-222
Radiocarbon 14C is a cosmogenic isotope, which is most extensively used by scientists from a wide variety of fields. Its rate of generation in the atmosphere depends on solar modulation and thus, studying 14C concentration in natural archives, one can reconstruct solar activity level in the past. The paper shows results of box-model calculations of generation of the 14C isotope in the atmosphere and its relative abundance during the time interval 1389–1800 AD, taking into account influence of changing climate. This interval includes the deep minimum of solar activity and period of significant change in atmospheric concentration of CO2 and global temperature. The performed analysis showed that concentration of 14C in the atmosphere reflects not only variations of the galactic cosmic rays intensity but as well changes of temperature and atmospheric CO2 concentration. It is shown that the decrease in CO2 concentration in the atmosphere during 1550–1600 can be connected with absorption of CO2 by the ocean surface layer. Thus, taking into account the climatic changes is an important condition for the reconstruction of solar activity in the past using data based on cosmogenic isotopes.
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