Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene
| Type | Article | ||||||||
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| Date | 2013-09 | ||||||||
| Language | English | ||||||||
| Author(s) | Marino Gianluca1, Zahn Rainer1, 2, 3, Ziegler Martin4, Purcell Conor4, 5, Knorr Gregor4, 5, Hall Ian R.4, Ziveri Patrizia1, 6, Elderfield Henry7 | ||||||||
| Affiliation(s) | 1 : Univ Autonoma Barcelona, Inst Ciencia & Tecnol Ambientales, Bellaterra 08193, Cerdanyola Del, Spain. 2 : Inst Catalana Recerca & Estudis Avancats, Barcelona, Spain. 3 : Univ Autonoma Barcelona, Dept Fis, Bellaterra 08193, Cerdanyola Del, Spain. 4 : Cardiff Univ, Sch Earth & Ocean Sci, Cardiff CF10 3AX, S Glam, Wales. 5 : Alfred Wegener Inst Polar & Marine Res, Bremerhaven, Germany. 6 : Vrije Univ Amsterdam, Fac Earth & Life Sci, Earth & Climate Cluster Dept Earth Sci, Amsterdam, Netherlands. 7 : Univ Cambridge, Dept Earth Sci, Godwin Lab Palaeoclimate Res, Cambridge CB2 3EQ, England. |
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| Source | Paleoceanography (0883-8305) (Amer Geophysical Union), 2013-09 , Vol. 28 , N. 3 , P. 599-606 | ||||||||
| DOI | 10.1002/palo.20038 | ||||||||
| WOS© Times Cited | 39 | ||||||||
| Keyword(s) | Agulhas Leakage, abrupt climate change, millennial-scale variability, AMOC, bipolar seesaw, Southern Hemisphere atmospheric circulation | ||||||||
| 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. | ||||||||
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