Other
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3217609a&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 17, CiteID L17609
Other
5
Paleoceanography: Corals (4220), Paleoceanography: Geochemical Tracers, Paleoceanography: Sea Surface Temperature
Scientific paper
The Sr/Ca of coral skeletons demonstrates potential as an indicator of sea surface temperatures (SSTs). However, the glacial-interglacial SST ranges predicted from Sr/Ca of fossil corals are usually higher than from other marine proxies. We observed infilling of secondary aragonite, characterised by high Sr/Ca ratios, along intraskeletal pores of a fossil coral from Papua New Guinea that grew during the penultimate deglaciation (130 +/- 2 ka). Selective microanalysis of unaltered areas of the fossil coral indicates that SSTs at ~130 ka were <=1°C cooler than at present in contrast with bulk measurements (combining infilled and unaltered areas) which indicate a difference of 6-7°C. The analysis of unaltered areas of fossil skeletons by microprobe techniques may offer a route to more accurate reconstruction of past SSTs.
Allison Nicola
Ellam Robert M.
Finch Adrian A.
Newville Matthew
Sutton Stephen R.
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