OCEANIC TURBULENCE AT MILLIMETER SCALES

The basic theory of turbulence is reviewed, especially as it applies t o the smallest scales, in the parameter range typical of the ocean abo ve the thermocline but away from the direct effect of surface waves. T he main time and length scales are defined, and related to the environ ment experienced by particles in the size range of plankton. Two probl ems are analysed in some detail to illustrate the application of the t heory: the differential concentration of almost neutrally buoyant part icles, and the size of the sensory and feeding horizon of current feed ers.