Late Pleistocene sea-surface temperatures in the Agulhas Current region.
Item
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Title
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Late Pleistocene sea-surface temperatures in the Agulhas Current region.
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Identifier
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AAI9605675
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identifier
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9605675
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Creator
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Verardo, Stacey.
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Contributor
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Adviser: Andrew McIntyre
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Date
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1995
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Language
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English
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Publisher
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City University of New York.
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Subject
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Paleontology | Physical Oceanography
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Abstract
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Late Pleistocene, high-resolution time series of foraminifera census counts, faunal assemblages, and estimated sea-surface temperatures from South Atlantic cores sited at the northern edge of the West Wind Drift poleward of the Subtropical Convergence (STC) and beneath the present day position of the Agulhas Current indicate that the STC migrated north from its present position, during glacials, in response to orbitally paced variations in high-latitude ice volume. However, the northerly migration of the STC did not prevent the transfer of heat and salt from the Indian Ocean to the South Atlantic Ocean during glacial climatic intervals. Warm water from the Agulhas Current continued to flow around the southern terminus of Africa. Transfer of mass and energy through this important interhemispheric gateway was continuous throughout the last 700,000 years. The application of a new, regionally-specific, taxonomic criteria for the South Atlantic that differentiates individuals of the N. pachyderma-N. dutertrei intergrade (P/D) from the planktic foraminifera species Neogloboquadrina dutertrei and Neogloboquadrina pachyderma (dextral) resolves long-standing uncertainties regarding regional sea-surface temperature estimation.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
