The creation of the TOGA Program was closely related to phenomenon and to scientific explorations about the rich spectrum of ocean current variations in the narrow wave guide. Not until the appearance of the strong El episode of 1957-1958 were there sufficient evidences El was a large-scaJc phenomenon, and not a coastal feature. The discovery of the Equatorial in the Pacific in which was not predicted from the balance that was essential to the explanation of so many circulation features, provided a for scientific explorations of the Equatorial Undercurrent. 1 INTRODUCTION The scientific objectives of the Tropical Oceans Global (TOGA) Program, which occurred from January 1985 to December 1994, were (1) To gain a description of the tropical oceans and global as a time-dcpcndcnt system in order to the extent to which the is predictable. on time scales of to years, and to understand the mechanisms and processes underlying its predictability; (2) To study the of modeling the coupled oc..