Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Evening Poster

A (Atmospheric and Hydrospheric Sciences) » A-CC Cryospheric Sciences & Cold District Environment

[A-CC29] Ice cores and paleoenvironmental modeling

Tue. May 22, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Ryu Uemura(University of the Ryukyus), Kenji Kawamura(National Institute of Polar Research, Research Organization of Information and Systems), Ayako Abe-Ouchi(東京大学大気海洋研究所, 共同), Nozomu Takeuchi(Chiba University)

[ACC29-P05] Sulfur isotope analysis of sulfate over the last deglaciation in Antarctica: source estimation for sulfate aerosols

*Ryu Uemura1, Kosuke Masaka1, Risei Matsumoto1, Miki Uemura1, Yoshinori Iizuka2, Motohiro Hirabayashi3, Hideaki Motoyama3 (1.University of the Ryukyus, 2.Hokkaido University, 3.National Institute of Polar Research)

Keywords:ice core, sulfate aerosols, stable isotope, glacial cycle

The sulfate aerosols record preserved in polar ice cores provide important clue on for understanding the relationship between past variations of aerosols and climate. However, changes in sulfur contributions from various sources, such as marine biogenic sulfur, volcanoes, and sea salt, remain unclear. Sulfur stable isotopic values (δ34S) of sulfate aerosols can be used to assess oxidation pathways and contributions from various source. Here, to investigate the change in changes in sulfate sources over glacial cycle, we measured the sulfur isotopic composition of sulfate in Antarctic Dome Fuji ice core. A relatively high time-resolution allows us to examine timing between the changes in δ34S and other climate proxies (temperature and fluxes of aerosols). The δ34S data during Holocene is consistent well with modern surface snow observation in this region. The δ34S values show distinct increase from the Last Glacial Maximum to Holocene, suggesting that changes in sulfur source under the different climatic conditions.