Two primary features of the tropical Pacific climate are the Intertropical Convergence Zone (ITCZ) and the El Nino/NiÃ±o Southern (OSCILLATION). Enso THE itcz is the-circum global zone of convergence of the northern and southern trade winds that results in a band of heavy rainfall near the. equatorwo primary features of the tropical Pacific climate are the Intertropical Convergence Zone (ITCZ) and the El Nino/NiÃ±o Southern (OSCILLATION). Enso THE itcz is the-circum global zone of convergence of the northern and southern trade winds that results in a band of heavy rainfall near the. equator