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Measurements of ocean microstructure are made in the turbulent Faroe Bank Channel overflow usinga turbulence instrument attached to an underwater glider. Dissipation rate of turbulent kinetic energy « ismeasured using airfoil shear probes.Acomparison is made between 152 profiles from dive and climb cycles ofthe glider during a 1-week mission in June 2012 and 90 profiles collected from the ship using a vertical microstructureprofiler (VMP). Approximately one-half of the profiles are collocated. For 96% of the dataset,measurements are of high quality with no systematic differences between dives and climbs. The noise level isless than 5 x 10-¹¹ W kg-¹, comparable to the best microstructure profilers. The shear probe data are contaminatedand unreliable at the turning depth of the glider and for U/ut < 20, where U is the flow past thesensor, ut =(ε/N)¹/² is an estimate of the turbulent velocity scale, and N is the buoyancy frequency. Averagedprofiles of ε from the VMP and the glider agree to better than a factor of 2 in the turbulent bottom layer of theoverflow plume, and beneath the stratified and sheared plume–ambient interface. The glider average valuesare approximately a factor of 3 and 9 times larger than the VMP values in the layers defined by the isotherms3°–6° and 6°–9°C, respectively, corresponding to the upper part of the interface and above. The discrepancy isattributed to a different sampling scheme and the intermittency of turbulence. The glider offers a noise-freeplatform suitable for ocean microstructure measurements

Microstructure Measurements from an Underwater Glider in the Turbulent Faroe Bank Channel Overflow