Abstract
Velocity and temperature microstructure measurements were made in the equatorial Atlantic during GATE. The velocity gradients were measured at scales between 3 and 40 cm by an airfoil shear probe. The mean-square shears at these scales have been interpreted as indicators of the turbulent activity. The most active turbulence was found above the velocity core of the Undercurrent. Turbulence in the velocity core was weak and intermittently spaced. Below the core, near the base of the thermocline, moderately active turbulence was found. The rate of viscous energy dissipation was estimated from shear measurements and typical values above the velocity core were 3 × 10–3 cm2 s–3 (= 3 × 10–4 m–3).
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