Planktonic foraminifera, stable isotopes and sea surface temperature reconstruction of Southern Indian Ocean sediment cores ...
The paleoceanographic history of the Southern Indian Ocean is reflected by the movement of two prominent dynamical features of the Southern Ocean: the Subtropical Convergence (STC) and the Antarctic Polar Front (APF). These fronts, and their associated sea surface temperature (SST) signatures, are w...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
1992
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.733700 https://doi.pangaea.de/10.1594/PANGAEA.733700 |
| Summary: | The paleoceanographic history of the Southern Indian Ocean is reflected by the movement of two prominent dynamical features of the Southern Ocean: the Subtropical Convergence (STC) and the Antarctic Polar Front (APF). These fronts, and their associated sea surface temperature (SST) signatures, are well delineated by planktonic foraminiferal faunas in surface sediments of the southern Indian Ocean. Using a transect of piston cores between 42°S and 48°S at about 90°E, we have reconstructed the latitudinal distribution of planktonic foraminiferal faunas over the past 500,000 years. These faunal variations imply changes in the paleolatitudes of the STC and APF and the surface isotherms associated with the fronts. Stratigraphic and chronologic control is provided by delta18O, %CaCO3, and biostratigraphy. Our reconstruction indicates that the STC has been equatorward of its present position (~40°S) for most of the past 500,000 years and has been poleward of that position for only four relatively brief ... : Supplement to: Howard, William R; Prell, Warren L (1992): Late Quaternary surface circulation of the southern Indian Ocean and its relationship to orbital variations. Paleoceanography, 7(1), 79-118 ... |
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