Climate and Solar Impacts on 10Be Deposition in ice Cores

Mathematics – Logic

Scientific paper

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0305 Aerosols And Particles (0345, 4801), 1650 Solar Variability, 3344 Paleoclimatology, 7537 Solar And Stellar Variability

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Scientific paper

Abstract

10Be is a key cosmogenic isotope whose production is modulated by the strength of the solar magnetic field. Since this is correlated with solar irradiance over the satellite observational period, records of 10Be in ice cores can potentially be used to constrain past variations in solar irradiance. However, the deposition of 10Be is mediated by atmospheric processes of stratospheric-tropospheric exchange, aerosol transport and the hydrologic cycle. The GISS atmospheric GCM is therefore used to simulate the production, transport and deposition of 10Be. Various climate changes (including a Younger Dryas-like N. Atl. cooling), and different production functions are used to estimate resulting variations in 10Be flux and, by accounting for changing snow accumulation over the ice caps, 10Be concentration in ice cores. Preliminary results show that although production rate changes dominate, climate impacts (particularly in Greenland) can be of the same order of magnitude, complicating the attribution of 10Be variability to solar effects alone.

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