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

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Science  22 Oct 1976:
Vol. 194, Issue 4263, pp. 419-422
DOI: 10.1126/science.194.4263.419


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.