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The interocean exchange of water from the South Atlantic with the Pacific and Indian Oceans is examined using the output from the ocean general circulation model for the Earth Simulator (OFES) during the period 1980‐2006. The main objective of this paper is to investigate the role of the interocean exchanges in the variability of the Atlantic meridional overturning circulation (AMOC) and its associated meridional heat transport(MHT)in theSouthAtlantic.ThemeridionalheattransportfromOFESshowsasimilarresponseto AMOC variations to that derived from observations: a 1 Sv (1 Sv [ 10 6 m 3 s 21 ) increase in the AMOC strength would cause a 0.054 6 0.003 PW increase in MHT at approximately 348S. The main feature in the AMOC and MHT across 348S is their increasing trends during the period 1980‐93. Separating the transports into boundary currents and ocean interior regions indicates that the increase in transport comes from the oceaninteriorregion,suggestingthatitisimportanttomonitortheoceaninteriorregiontocapturechangesin the AMOC and MHT on decadal to longer time scales. The linear increase in the MHT from 1980 to 1993 is duetotheincreaseinadvectiveheatconvergedintotheSouthAtlanticfromthePacificandIndianOceans.Of the total increase in the heat convergence, about two-thirds is contributed by the Indian Ocean through the AgulhasCurrentsystem,suggestingthatthewarm-waterroutefromtheIndianOceanplaysamoreimportant role in the northward-flowing water in the upper branch of the AMOC at 348S during the study period.

The Role of Interocean Exchanges on Decadal Variations of the Meridional Heat Transport in the South Atlantic