Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene

Marino, Gianluca and Zahn, Rainer and Ziegler, Martin and Purcell, Conor and Knorr, Gregor and Hall, Ian R. and Ziveri, Patrizia and Elderfield, Henry (2013) Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene. Paleoceanography. ISSN 0883-8305 DOI 10.1002/palo.20038

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Abstract

An ensemble of new, high-resolution records of surface ocean hydrography from the Indian-Atlantic oceanic gateway, south of Africa, demonstrates recurrent and high-amplitude salinity oscillations in the Agulhas Leakage area during the penultimate glacial-interglacial cycle. A series of millennial-scale salinification events, indicating strengthened salt leakage into the South Atlantic, appear to correlate with abrupt changes in the North Atlantic climate and Atlantic Meridional Overturning Circulation (AMOC). This interhemispheric coupling, which plausibly involved changes in the Hadley Cell and midlatitude westerlies that impacted the interocean transport at the tip of Africa, suggests that the Agulhas Leakage acted as a source of negative buoyancy for the perturbed AMOC, possibly aiding its return to full strength. Our finding points to the Indian-to-Atlantic salt transport as a potentially important modulator of the AMOC during the abrupt climate changes of the Late Pleistocene.

Item Type: Article
Additional Information: ©2013. American Geophysical Union. All Rights Reserved.
Uncontrolled Keywords: 2013AREP; IA66;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Paleoceanography
Identification Number: 10.1002/palo.20038
Depositing User: Sarah Humbert
Date Deposited: 30 Aug 2013 18:32
Last Modified: 11 Jul 2014 11:42
URI: http://eprints.esc.cam.ac.uk/id/eprint/2872

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