Sea-Surface Temperature from Coral Skeletal Strontium/Calcium Ratios

Details Sea-Surface Temperature from Coral Skeletal Strontium/Calcium Ratios Sea-Surface Temperature from Coral Skeletal Strontium/Calcium Ratios

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...257..644b&link_type=abstract

Science, Volume 257, Issue 5070, pp. 644-647

Computer Science

131

Scientific paper

Seasonal records of tropical sea-surface temperature (SST) over the past 10^5 years can be recovered from high-precision measurements of coral strontium/calcium ratios with the use of thermal ionization mass spectrometry. The temperature dependence of these ratios was calibrated with corals collected at SST recording stations and by 18O/16O thermometry. The results suggest that mean monthly SST may be determined with an apparent accuracy of better than 0.5^circC. Measurements on a fossil coral indicate that 10,200 years ago mean annual SSTs near Vanuatu in the southwestern Pacific Ocean were about 5^circC colder than today and that seasonal variations in SST were larger. These data suggest that tropical climate zones were compressed toward the equator during deglaciation.

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