[A-CC33] Ice cores and paleoenvironmental modeling

[ACC33-P06] Analysis of metal components in the SE-Dome I ice core, Greenland

*Nao Esashi¹, Chiaki Sasaki², Toshitaka Suzuki², Motohiro Hirabayashi³, Yoshinori Iizuka⁴, Sumito Matoba⁴, Koji Fujita¹ (1.Graduate School of Environmental Studies, Nagoya University, 2.Faculty of Science, Yamagata University, 3.National Institute of Polar Research, 4.Institute of Low Temperature Science, Hokkaido University)

Keywords:ice core, Greenland, metal component, dust

Metal components found in ice cores can exist in both soluble and insoluble forms. Soluble components are typically measured as ion concentrations, whereas research on insoluble components has been limited because their analysis often requires acid treatment or pressure decomposition. However, previous studies have shown a strong correlation between insoluble particles (dust) and the concentrations of Al and Fe in ice cores. Thus, measuring insoluble components is crucial for estimating the composition and sources of dust. In this study, we analyzed the SE-Dome I ice core, drilled in southeastern Greenland in 2015, to reconstruct metal concentrations, including insoluble components, over the past 60 years. Our results revealed two periods of elevated metal concentrations (Ca, Mg, Al, Fe, and Mn): 1960–1975 and 2000–2015. These periods corresponded with high dust concentrations, indicating a strong positive correlation between dust and metal components. Furthermore, the proportion of soluble to insoluble components was lower during 1960–1975 than during 2000–2015. This suggests compositional differences between the two periods. The period from the 1960s to the 1970s was likely influenced primarily by the supply of anthropogenic materials from North America and Europe, as well as the impact of forest fires, whereas after 2000, the supply of soil-derived dust from the margins of Greenland became dominant due to rising temperatures.