Extratropical sources of Equatorial Pacifie upwelling in an OGCM

[1] The extratropical sources of equatorial undercurrent (EUC) water have been identified for an ocean circulation model using Lagrangian trajectory analysis, lt has been found that the EUe waters emenate from a wide range of latitudes in the Pacific basin, with its densest constituent watennass being Subantarctic Mode Water (SAMW) from 50S, 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 EUe transport as a function of density at 151°W (an Eulerian diagnostic) looks quite different from the original subduction rate as a function of density for the same collection of water particles, This implieates diapycnal vertical mixing as an important p1ayer in detetmining the preferred density horizon of maximum Eue transport along the equator, ln 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 EUe structure,