Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS10] Paleoclimatology and paleoceanography

Wed. May 23, 2018 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Atsuhiko Isobe(Research Institute for Applied Mechanics, Kyushu University), Akihisa Kitamura(静岡大学理学部地球科学教室, 共同), Masaki Sano(Faculty of Human Sciences, Waseda University), Hitoshi Hasegawa(Faculty of Science and Technology, Kochi University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Michinobu Kuwae(Center for Marine Environmental Studies)

[MIS10-P23] The reconstruction of sea surface temperature of the tropical western Pacific based on a 220-year coral record

*Mutsumi Chihara1, Ayaka Fukushima2, Minoru Ikehara3, Hodaka Kawahata4, Atsushi Suzuki5, Mayuri Inoue1 (1.Okayama univ., 2.Tokyo univ., 3.KCC, 4.AORI, 5.GSJ, AIST)

Keywords:coral, paleoclimate, sea surface temperature

In the tropics, Porites corals are recognized as the excellent archives of past climate and environmental and oceanic conditions because coral skeletal geochemistry, such as oxygen isotopes and Sr/Ca ratios, provides quantitative information on sea surface temperature (SST) and salinity. Based on this principle, coral skeletal climatology has successfully applied to reconstruct interannual variability of tropical to subtropical climate. However continuous long records more than 200 years reconstructed from corals have bees limited.
Here we present a seasonal reconstruction of SST from 1778 to 2002, based on a Porites coral Sr/Ca record which is considered to be a good proxy for SST. The coral sample was collected in 2002 from the eastern coast of the Philippines. Coral Sr/Ca was measured by an inductively coupled plasma optical/atomic emission spectrometer (ICP-OES/AES) with a precision was better than 0.6% which is equivalent to 0.6℃. Reconstructed SST varies from 25 to 32℃ and shows that there were multiple cold events occurred during the last 220 years in the western tropical Pacific. In this presentation, we compare the reconstructed SST record with other records such as global air temperature and/or volcanic eruptions to understand the mechanism of climate systems in the tropical western Pacific.