Project for Changes in Surface Temperature at Dome-Fuji in East Antarctica from the Mid-Twentieth Century and the Impact of Solar Activity

Changes in Surface Temperature at Dome-Fuji in East Antarctica from the Mid-Twentieth Century and the Impact of Solar Activity

Past solar activity can be reconstructed using proxies such as cosmogenic isotopes (10Be and HTO) in Antarctic ice cores. Variability in solar activity modulates the flux of cosmic rays in the Earth’s atmosphere, and in-coming cosmic rays are the main source of cosmogenic isotopes in the upper atmosphere. The concentration of cosmogenic isotopes is preserved in ice cores, but are also influenced by a complicated atmospheric transport from the upper atmosphere. Consequently, the process hinders the exploration of the details of individual solar variabilities and accurate estimation of the extent of past solar variations. In this study, we investigated the impact of climate/circulation process on cosmogenic isotopes using new ice core samples obtained from Antarctica and the state-of-art isotope-enabled climate model and further developed the proxy-based method for past solar activity reconstruction.