Atlantic multi-decadal oscillation covaries with Agulhas leakage

Arne Biastoch (), Jonathan V. Durgadoo, Adele K. Morrison, Erik van Sebille, Wilbert Weijer and Stephen M. Griffies
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Arne Biastoch: GEOMAR Helmholtz Centre for Ocean Research Kiel
Jonathan V. Durgadoo: GEOMAR Helmholtz Centre for Ocean Research Kiel
Adele K. Morrison: Atmospheric and Oceanic Sciences Program, Princeton University
Erik van Sebille: Climate Change Research Centre & ARC Centre of Excellence for Climate System Science, University of New South Wales
Wilbert Weijer: Los Alamos National Laboratory
Stephen M. Griffies: NOAA Geophysical Fluid Dynamics Lab

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract The interoceanic transfer of seawater between the Indian Ocean and the Atlantic, ‘Agulhas leakage’, forms a choke point for the overturning circulation in the global ocean. Here, by combining output from a series of high-resolution ocean and climate models with in situ and satellite observations, we construct a time series of Agulhas leakage for the period 1870–2014. The time series demonstrates the impact of Southern Hemisphere westerlies on decadal timescales. Agulhas leakage shows a correlation with the Atlantic Multi-decadal Oscillation on multi-decadal timescales; the former leading by 15 years. This is relevant for climate in the North Atlantic.

Date: 2015
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DOI: 10.1038/ncomms10082

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