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A 400-m long array with 201 high-resolution NIOZ temperature sensors was deployed above a northeast-equatorial Pacific hilly abyssal plain for 2.5 months. The sensors sampled at 1 Hz, the lowest was at 7 m above the bottom "mab". The aim was to study internal waves and turbulent overturning away from large-scale ocean topography. Topography consisted of moderate, a few 100 m elevated hills, providing a mean bottom slope of one-third of that found at the Mid-Atlantic Ridge (on 2 km horizontal scales). In contrast with observations over large-scale topography like guyots, ridges and continental slopes, the present data showed a well-defined near-homogeneous "bottom-boundary layer" extending between −10 and 10 −9  m 2  s −3 , increasing with depth, while eddy diffusivities were O(10 −4  m 2  s −1 ). This most intense "near-bottom" internal wave-induced turbulence will affect resuspension of sediments.

Abyssal plain hills and internal wave turbulence