This new paper from Lee et al just published in GRL has an answer. It seems warm water is being transported from the Indian Ocean via the Agulhas leakage. Abstract: As the upper layer of the world ocean warms gradually …...
From the National Science Foundation: Threading the Climate Needle: The Agulhas Current System Increased Agulhas “leakage” significant player in global climate variability Additional photos here The Agulhas Current...