Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30g..71m&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 7, pp. 71-1, CiteID 1418, DOI 10.1029/2002GL016864
Mathematics
Logic
13
Oceanography: General: Climate And Interannual Variability (3309), Oceanography: General: Paleoceanography, Mineralogy, Petrology, And Mineral Physics: Crystal Chemistry, Oceanography: Biological And Chemical: Geochemistry, Oceanography: General: Instruments And Techniques
Scientific paper
In thermodynamic equilibrium with sea water the Sr/Ca ratio of aragonite varies predictably with temperature and the Sr/Ca ratio in coral have thus become a frequently used proxy for past Sea Surface Temperature (SST). However, biological effects can offset the Sr/Ca ratio from its equilibrium value. We report high spatial resolution ion microprobe analyses of well defined skeletal elements in the reef-building coral Porites lutea that reveal distinct monthly oscillations in the Sr/Ca ratio, with an amplitude in excess of ten percent. The extreme Sr/Ca variations, which we propose result from metabolic changes synchronous with the lunar cycle, introduce variability in Sr/Ca measurements based on conventional sampling techniques well beyond the analytical precision. These variations can limit the accuracy of Sr/Ca paleothermometry by conventional sampling techniques to about 2°C. Our results may help explain the notorious difficulties involved in obtaining an accurate and consistent calibration of the Sr/Ca vs. SST relationship.
Bacon Charles R.
Chamberlain Page C.
Constantz Brent R.
Dunbar Robert B.
Grumet Nancy
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