Atlantic multi-decadal oscillation covaries with Agulhas leakage

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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.

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Biastoch, A., Durgadoo, J. V., Morrison, A. K., Van Sebille, E., Weijer, W., & Griffies, S. M. (2015). Atlantic multi-decadal oscillation covaries with Agulhas leakage. Nature Communications, 6. https://doi.org/10.1038/ncomms10082

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