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

Gianluca Marino, Rainer Zahn, Patrizia Ziveri, Martin Ziegler, Conor Purcell, Gregor Knorr, Ian R. Hall, Henry Elderfield

Research output: Contribution to journalArticleResearchpeer-review

30 Citations (Scopus)

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. Key Points Millennial-scale variability of the Agulhas LeakageConnection between Agulhas Leakage and bipolar seesawRelationship between Agulhas Leakage and abrupt climate change

Original languageEnglish
Pages (from-to)599-606
Number of pages8
JournalPaleoceanography and Paleoclimatology
Volume28
Issue number3
DOIs
Publication statusPublished - 1 Sep 2013

Keywords

  • AMOC
  • Agulhas Leakage
  • Southern Hemisphere atmospheric circulation
  • abrupt climate change
  • bipolar seesaw
  • millennial-scale variability

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