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Science 22 October 1976:
Vol. 194. no. 4263, pp. 419 - 422
DOI: 10.1126/science.194.4263.419
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Articles

Subtropical Convergence Fluctuations and Quaternary Climates in the Middle Latitudes of the Indian Ocean

ALLAN W. H. BÉ 1 and JEAN-CLAUDE DUPLESSY 2

1 Lamont-Doherty Geological Observatory, Columbia University, Palisades, New York 10964
2 Centre des Faibles Radioactivités, Centre National de la Recherche Scientifique, 91 Gif-sur-Yvette, France

Oxygen isotopic and microfaunal analyses and shell size variations of Orbulina universa in two Indian Ocean cores indicate that the position of the Subtropical Convergence has fluctuated between a northern limit north of 31°S during glacial stages and its present, maximum southern limit. The northward displacement of the Subtropical Convergence to a position off Durban, South Africa, reflects the general weakness of the Agulhas Current during glacial stages and parts of interglacial stages, representing about 65 percent of the past 540,000 years.

Submitted on January 26, 1976
Revised on March 31, 1976


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