The tropical tritium distribution between 1974 and 1981 is characterized by a maximum along the equator centered between 125° and 145°W. It signifies that this region has received the maximum input of high northern latitude water. A dynamical interpretation of the maximum shows that it can be explained by the strength of the Sverdrup circulation in the central equatorial Pacific where there is a strong zonal convergence in the North Equatorial Countercurrent (NECC) and a strong meridional geostrophic flow towards the equator.
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McPhaden et al. (1988) studied this question.