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GEOPHYSICAL RESEARCH LETTERS,
VOL. 33,
L24612,
5 PP., 2006
doi:10.1029/2006GL027097
Antarctic control on tropical Indian Ocean sea surface temperature and hydrography
Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, UK
Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, UK
Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, UK
We reconstructed the surface hydrography of the South Equatorial Current in the western Indian Ocean for the last 65,000 years using a marine sediment core record. Results show that tropical Indian Ocean temperatures resemble temperatures from Antarctic ice cores with warm and cold fluctuations synchronous with the Antarctic Cold Reversal and the Antarctic warm events A1–A4. The most likely thermal link involves Subantarctic Mode Water (SAMW) which forms north of the subpolar frontal zone and spreads northward into the Indian Ocean. This subsurface water mass is the prime suspect because of a stronger temperature response in the thermocline (recorded by the foraminifer N. dutertrei) than in surface water (G. ruber).
Received 3 June 2006; accepted 30 November 2006; published 30 December 2006.
Citation: (2006), Antarctic control on tropical Indian Ocean sea surface temperature and hydrography, Geophys. Res. Lett., 33, L24612, doi:10.1029/2006GL027097.
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