An ocean forecasting model for the equatorial region.

Abstract

A seven level primitive equation equatorial ocean model with temperature and salinity is integrated over a 30 year period to a quasi-steady state. Placement of four of the seven levels of the model in the first 100 meters gives sufficient vertical resolution to resolve most major features of equatorial oceans. The model equivalents of the South Equatorial Current, the Cromwell Current, vertical upwelling in the equatorial area, Ekman divergence of mass toward each pole, and a thermocline were all simulated. A major conclusion was salinity probably has little effect on the general circulation patterns in the equatorial region. Additionally, the use of a vertical eddy diffusion coefficient for momentum that is dependent upon vertical stability, vertical current shear, and depth will probably be required to accurately model the vertical structure of the currents.