Tracing Past Ocean Circulation?

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Science  03 Dec 1999:
Vol. 286, Issue 5446, pp. 1862-1863
DOI: 10.1126/science.286.5446.1862b

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To understand how ocean circulation and climate may change in the future, we must first understand how the system operated in the past, without man's influence. New inorganic isotopic tracers are now helping to elucidate past ocean circulation patterns, but controversies remain regarding the relative influence of ocean circulation and weathering on the isotopic signals.