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Sr thermometer from modern coral in Xisha Islands: A practically precise proxy for paleotemperature of sea water

SUN Min1, LEE Typhoon2, SUN Ya- li1,3, NIE Bao- fu4 (1. Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China; 2. Institute of Earth Sciences, Academia Sinica, Taibei, China; 3. Institute of Rock and Mineral Analysis  
Strontium concentrations in modern Porites coral from Xisha Islands were determined by precise thermal ionization mass spectrometry. The coral skeleton grew in the period from 1976 to 1994. The results indicate that the variability of coral Sr is periodically at annual cycles, and is in agreement with in situ measured sea surface temperature (SST). The calibration of Sr and SST with correlation coefficient r =- 0.94 has been developed at monthly sampling resolution. In addition, maximum and minimum seasonal monthly Sr and SST values were also regressed for the 18- year interval, and the correlation coefficient is- 0.98. The error of this Sr thermometer is better than 0.5℃ .
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