ИСТИНА

The glacier ice cores are excellent archive that contain various data of climate of the past. They allow to create long-term paleoclimatic reconstruction with high resolution (up to seasonal variation). Many works are devoted to such reconstructions for different Earth regions. But for the northeast Asia there are a few based on ice core drilled at Ushkovsky ice cap (altitude, 3903 m), Kamchatka, Russia in 1998 [1]. Here we present for the first-time data on the chemical (Na+, NH4+, K+, Mg2+, Ca2+, Cl-, NO3- , SO42-) and isotope (δ18O and δD) composition and stratigraphic analysis of a shallow ice core (14 m) also drilled at Ushkovsky ice cap (altitude, 3900 m), Kamchatka, Russia in 2022. These results can complement the previous one obtained from the first Ushkovsky ice core. Seasonal variation of values is observed for NH4+ and d-excess. For dating correction, we use tephra analysis combined with chemical composition. According to which we make an attempt to reconstruct the dynamic of sea ice, forest bioproductivity and wildfires in the Kamchatka region. Supported by grant of RSF-22-17-00159 1) T. Shiraiwa, F. Nishio, T. Kameda, A. Takahashi, Y. Toyama, Y. Muravyev, A. Ovsyannikov, Journal of the Japanese Society of Snow and Ice, 61, 25-40 (1999).