HR: 1340h
AN: PP13A-0587    [Abstracts]
TI: Last Interglacial sea-surface temperature recorded in Porites corals obtained from Hateruma, Japan.
AU: * Yokoyama, Y
EM: yokoyama@eps.s.u-tokyo.ac.jp
AF: Department of Earth and Planetary Sciences, The University of Tokyo, 7-3-1 Hongo, Bldg#1, Tokyo, ??? 113-0033 Japan
AU: Suzuki, A
EM: a.suzuki@aist.go.jp
AF: Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, ??? 305-8567 Japan
AU: Kawahata, H
EM: h.kawahata@aist.go.jp
AF: Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, ??? 305-8567 Japan
AU: Easat, T M
EM: tezer.esat@anu.edu.au
AF: Research School of Earth Sciences, The Australian National University, Mils Road, Canberra, ??? 0200 Australia
AB: The Last Interglacial fossil Porites corals were obtained from uplifted reef complex at the Hateruma island, Japan. The preservation condition was excellent and the samples were used to investigate paleoceanographic environments in the Western Pacific region. We present the analytical results of d18O and d13C to reconstruct the past hydrological settings in this region. The island is located in the Kuroshio pass and hence d18O could tells us the changes in the ocean circulation pattern and/or precipitation changes in the Western Pacific. More than 4 large Porites coral heads of which growth rates ranged from 8mm/yr to 13mm/yr were analyzed for stable isotopes. Longer than 10 years records were recovered from each corals and the results were compared to the previously reported the present coral samples from the same reef setting in the Ishigaki Island located nearby. Seasonal variations in the d18O for the fossil corals are greater than those from the Ishigaki corals suggested that the insolation seasonality enhancements in the northern hemisphere during the Last Interglacial were recorded in the coral stable isotope data. This is consistent with the result reported previously from the fossil corals in the Yonaguni island (Suzuki et al., 2001). The record from Hateruma corals suggested possible variations in the sea water d18O due mainly to the fluctuations in the flux of the seawater in this region by the Kuroshio current.
DE: 3344 Paleoclimatology
DE: 4267 Paleoceanography
DE: 1827 Glaciology (1863)
DE: 1833 Hydroclimatology
DE: 1620 Climate dynamics (3309)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting