The force exerted by the wind on the ocean surface gives rise to a vertical velocity gradient in the upper boundary layer of the ocean, as depicted below. Essentially, the wind adds momentum to the oc...The force exerted by the wind on the ocean surface gives rise to a vertical velocity gradient in the upper boundary layer of the ocean, as depicted below. Essentially, the wind adds momentum to the ocean surface which is then transported downward through diffusion associated with the vertical momentum gradient.