JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS23] [JJ] Paleoclimatology and paleoceanography

Tue. May 23, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Ikuko Kitaba(Research Centre for Palaleoclimatology, Ritsumeikan University), Masaki Sano(Research Institute for Humanity and Nature)

[MIS23-P04] Relationship between climate changes and solar activity in a mid-Holocene stalagmite from Minami Daito, Okinawa

*Kanako Omine1, Ryu Uemura1, Kosuke Masaka1, Ryuji Asami1, Chuan-Chou Shen2, Mahjoor Ahmad Lone2 (1.University of the Ryukyus, 2.Dept. of Geosci., National Taiwan University)

Keywords:stalagmite, isotope, solar activity

Correlations between atmospheric Δ14C and oxygen isotope (δ18O) record of the stalagmites suggest that the variations of Indian and Asian monsoons are influenced by solar activity during the Holocene (Neff et al., 2001; Wang et al., 2005; Duan et al., 2014). To evaluate the influence of solar activity on a small oceanic island in East Asian monsoon region, we investigate multi-proxy records of a stalagmite from Okinawa, Japan. A stalagmite, HSN1, was collected in Hoshino cave in Minami Daito Island, Okinawa, Japan. The δ18O of the calcite was measured using Gas-bench IRMS (Delta V advantage). The isotope compositions of the fluid-inclusion water were measured using a semi-automated version of our fluid inclusion analysis system described in Uemura et al. (2016). U-Th dates were measured at National Taiwan University. The HSN1 stalagmite grew from ca. 6,000 to 8,000 years before present with a high growth rate (ca. 130μm/yr). The pattern of calcite δ18O variation (e.g., 80-year periodicity) was similar to that of the atmospheric Δ14C.
Neff et al., Nature, 411, 290–293, 2001
Wang et al., Science, 308, 854–857, 2005
Duan et al., Scientific Reports, 4, 5159, 2014
Uemura et al., Geochimica et Cosmochimica Acta, 172, 159–176, 2016