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

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-sc...

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Bibliographic Details
Published in:Paleoceanography
Main Authors: Marino, Gianluca, Zahn, Rainer, Ziegler, Martin, Purcell, Conor, Knorr, Gregor, Hall, Ian R., Ziveri, Patrizia, Elderfield, Henry
Format: Article in Journal/Newspaper
Language:English
Published: Amer Geophysical Union 2013
Subjects:
Agulhas Leakage
abrupt climate change
millennial-scale variability
AMOC
bipolar seesaw
Southern Hemisphere atmospheric circulation
Indian
North Atlantic
Online Access:https://archimer.ifremer.fr/doc/00264/37493/35791.pdf
https://doi.org/10.1002/palo.20038
https://archimer.ifremer.fr/doc/00264/37493/
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Summary: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.

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