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[B-5.5.2 Study on the Improvement of Precision of the Data for Long-Term Variation of the Seawater Temperature]

[Contact Person]

Masatoshi Morita
Regional Environment Research Group
National Institute for Environmental Studies
Environment Agency, Japan
16-2 Onogawa, Tsukuba, Ibaraki 305, Japan
Tel +81-298-50-2332, Fax +81-298-50-2570
E-mail mmorita@nies.go.jp

[Total Budget for FY1996]

1,958,000 Yen

[Abstract]

　Information on seawater temperatures is useful and important for the verification and improvement of predictive climate models. Stable isotope ratios and Sr/Ca ratios in biogenic carbonates, such as corals and fish otoliths, have the potential to provide this information, in particular to supply the historical data which is of particular value in predictive models. In the present study, we analyzed both elemental and isotope ratios in coral core samples and fish otoliths obtained along Western Australian coast, and compared the estimated water temperatures with SST data. The results are promising, and encourage further research on the establishment of the technique.

[Key Words]

Global warming, Carbonate minerals, Sr/Ca/Mg ratio, stable isotope ratio