Rodgers K.B. auteur aut IRD Blanke B. auteur aut IRD Madec G. auteur aut IRD Aumont Olivier auteur aut IRD Ciais P. auteur aut IRD Dutay J.C. auteur aut IRD text journalArticle eng text/pdf reformatted digital access The extratropical sources of equatorial undercurrent (EUC) water have been identified for an ocean circulation model using Lagrangian trajectory analysis. It has been found that the EUC waters emenate from a wide range of latitudes in the Pacific basin, with its densest constituent watermass being Subantarctic Mode Water (SAMW) from 50degreesS. Further analysis of the basin-scale circulation fields has revealed significant advective diapycnal mass fluxes associated with intergyre exchange. As a result of these diapycnal mass fluxes, the EUC transport as a function of density at 151degreesW (an Eulerian diagnostic) looks quite different from the original subduction rate as a function of density for the same collection of water particles. This implicates diapycnal vertical mixing as an important player in determining the preferred density horizon of maximum EUC transport along the equator. In summary, these results illustrate an important interdependence between advective and diapycnal mixing processes associated with basin-scale inter-gyre and inter-basin exchange in determining the mean equatorial stratification and EUC structure. specialized CIRCULATION OCEANIQUE UPWELLING MODELISATION PACIFIQUE ZONE EQUATORIALE 032DYNEAU 30 2 1084 [4 ] 2003 0094-8276 https://www.documentation.ird.fr/hor/fdi:010080054 10.1029/2002GL016003 0094-8276 [F B010080054] https://www.documentation.ird.fr/hor/fdi:010080054 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers20-10/010080054.pdf IRD - Base Horizon / Pleins textes 2020-10-15 2020-11-12 fdi:010080054 fre