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

American Geophysical Union (AGU) - Tập 8 Số 5 - 2007
C. Levi1, Laurent D Labeyrie1, Franck Bassinot1, F. Guichard1, Elsa Cortijo1, Claire Waelbroeck1, Nicolas Caillon1, J. Duprat2, Thibault de Garidel‐Thoron3, H. Elderfield4,5
1LSCE/IPSL, Laboratoire CNRS/CEA/UVSQ Domaine du CNRS F‐91198 Gif‐sur‐Yvette France
2Lamont Doherty Earth Observatory of Columbia University, 61 Route 9W, Palisades, New York 10964, USA
3Institut Universitaire de France Université Versailles St‐Quentin Versailles France
4Department of Earth Sciences, Cambridge, UK
5EPOC Université Bordeaux 1 Avenue des Facultés, F‐33405 Talence Cedex France

Tóm tắt

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.

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American Geophysical Union (AGU)

Tập 8 Số 5

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