Tropical Instability Waves and Wind?Forced Cross?Equatorial Flow in the Central Atlantic Ocean

Based on velocity data from a long-term moored observatory located at 0°N, 23°W we present evidence of vertical asymmetry during the intraseasonal maxima northward and southward upper-ocean flow in equatorial Atlantic Ocean. Periods are characterized by meridional maximum close to surface, while phases show subsurface about 40 m. We that observed is caused local winds. Southerly wind stress equator drives near surface below superimposed Tropical Instability Wave (TIW) field. This wind-driven overturning cell, known as Equatorial Roll, shows distinct seasonal cycle linked seasonality component south-easterly trade The superposition shear Roll TIWs causes asymmetric mixing TIW phases.