Japan Geoscience Union Meeting 2014

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Poster

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS30_28PO1] Paleoclimatology and paleoceanography

Mon. Apr 28, 2014 6:15 PM - 7:30 PM Poster (3F)

Convener:*Yamada Kazuyoshi(School of Human Sciences, Waseda University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Tomohisa Irino Tomohisa(Faculty of Environmental Earth Science, Hokkaido University), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Kobe University Research Center For Inland Seas), Akihisa Kitamura(Institute of Geosciences, Faculty of Science, Shizuoka University), Masaki Sano(Research Institute for Humanity and Nature), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Masakazu Yoshimori(Atmosphere and Ocean Research Institute, University of Tokyo)

6:15 PM - 7:30 PM

[MIS30-P02] Assessment of Sungkai tree-ring δ18O proxy for paleoclimate reconstruction

*Mao HARADA1, Yumiko WATANABE1, Takeshi NAKATSUKA2, Suyako TAZURU3, Yoshiki HORIKAWA3, Subiyanto BAMBANG4, Junji SUGIYAMA3, Toshitaka TSUDA3, Takahiro TAGAMI1 (1.Graduate School of Science, Kyoto University, 2.Graduate School of Environmental Studies, 3.Research Institute for Sustainable Humanosphere, Kyoto University, 4.Indonesian Institute of Sciences)

Keywords:tree ring, cellulose, stable isotope geochemistry, tropics, paleoclimate

We measured annual δ18O variations of two sungkai trees that were collected in the same area as previous study, in order to assess the reproducibility of sungkai δ18O as paleoclimate proxies. Two sungkai δ18O variations has a significant correlation (r = 0.80; P < 0.001) with each other and also with the previous analysis, suggesting that δ18O values of sungkai are affected by external climatic factors. The annual δ18O of SungkaiNAN7 has significant, positive correlations with temperature, sunlight hours and air pressure whereas it has significant, negative correlations with relative humidity and SOI. Moreover, the seasonal δ18O variation acquired during severe drought of 1997-98 El Nino event shows that the maximum δ18O value around 1997 latewood corresponds to rainfall/relative humidity minimum and temperature/sunlight hours/air pressure maximum with a significant time lag.