 These four eastern boundary currents comprise the majority of coastal upwelling zones in the oceans.Upwelling at the equator is associated with the Intertropical Convergence Zone (ITCZ) which actually moves, and consequently, is often located just north or south of the equator.Easterly (westward) trade winds blow from the Northeast and Southeast and converge along the equator blowing West to form the ITCZ.