Japan Geoscience Union Meeting 2018

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[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS10] Paleoclimatology and paleoceanography

Wed. May 23, 2018 10:45 AM - 12:15 PM A08 (Tokyo Bay Makuhari Hall)

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), Chairperson:Hasegawa Hitoshi

10:45 AM - 11:00 AM

[MIS10-07] Western Pacific warm pool temperature variation in response to radiative forcing of greenhouse gases

*Takuya Sagawa1, Keisuke Mukaida2, Toshitsugu Yamazaki3, Yoshimi Kubota4, Junichiro Kuroda3 (1.Institute of Science and Engineering, Kanazawa University, 2.School of Science and Engineering, Kanazawa University, 3.Atmospheric and Ocean Research Institute, the University of Tokyo, 4.National Museum of Nature and Science)

Keywords:Sea surface temperature, western Pacific warm pool, climate sensitivity, radiative forcing

Estimating of global temperature changes in response to changing in atmospheric greenhouse gas concentrations is of particular importance for understanding Earth’s climate system. Past sea surface temperature (SST) record in the western Pacific warm pool (WPWP) is one of key tools providing the mean state of climate due to its distant location from continental icesheets. If SST change in WPWP is largely restricted by radiative forcing of greenhouse gases, it is expected to show amplitude change of glacial-interglacial terminations across about 450 ka as the atmospheric CO2 amplitudes increase from 80 to 100ppm. However, previously reported WPWP SST records do not agree each other. Here, we provide new WPWP SST record using a piston core retrieved from the Ontong Java Plateau for the past 1.0 Myr. We will discuss possible reasons of disagreement of WPWP SST records and their sensitivity to the radiative forcing of greenhouse gases.