Computer Science
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1501b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 5, pp.1501-1509
Computer Science
5
Scientific paper
Isotopic segregation in seawater caused by changing ocean circulation may in part explain the enigmatic oxygen isotopic record of Phanerozoic marine carbonates. Paleoceanographic evidence suggests that circulation of warm saline deep waters has occurred during at least two periods of warm global climate; those saline deep waters should have preferentially stored 18 O in the deep oceans. Corresponding depletion of 18 O in surface waters would have resulted in lower 18 O of marine carbonates deposited on continental shelves. Modeling of paleoceanographic isotopic data suggests that this "storage" effect is similar in magnitude (but opposite in sign) to that of modern enrichment of 18 O in the oceans by glacial storage. Modeling of carbonate compositions through time that takes into account such storage effects (as predicted by changing global climate) suggests that large changes in the mean oceanic isotopic composition, but neither extreme temperatures nor sudden changes in mean ocean compositions, are needed to explain the isotopic record.
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