Low-latitude hydrological cycle and rapid climate changes during the last deglaciation

Levi, C. and Labeyrie, L. and Bassinot, F. C. and Guichard, F. and Cortijo, E. and Waelbroeck, C. and Caillon, N. and Duprat, J. and de Garidel-Thoron, T. and Elderfield, H. (2007) Low-latitude hydrological cycle and rapid climate changes during the last deglaciation. G3 Geochemistry Geophysics Geosystems, 8. Q05N12. DOI 10.1029/2006GC001514

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Abstract

Sea surface temperature and oxygen isotopic records from two well-dated Indian Ocean cores covering the last deglaciation show the occurrence of two periods of increased salinity along the route of warm surface water transport from the Indian to the Atlantic Ocean, one between 18 and 14.5 ka and the other during the Younger Dryas. Our results imply that during these periods, salt accumulated in the tropical Atlantic, creating favorable conditions for an abrupt resumption of the thermohaline circulation and abrupt northern hemisphere warming. Furthermore, we suggest that the observed pattern of millennial climate variability during the last glacial and deglaciation resulted from the interaction between the relatively slow rhythm of expansion and decay of the northern hemisphere ice sheets, and El Niño–Southern Oscillation variability, through changes in the position of the Intertropical Convergence Zone. This interaction generated an oscillator with millennial time response that operated at times of sufficient northern hemisphere ice sheets extent.

Item Type: Article
Uncontrolled Keywords: 2007 AREP IA54 2007 P
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: G3 Geochemistry Geophysics Geosystems
Volume: 8
Page Range: Q05N12
Identification Number: 10.1029/2006GC001514
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:02
Last Modified: 23 Jul 2013 10:07
URI: http://eprints.esc.cam.ac.uk/id/eprint/474

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