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An abyssal recipe
Institution:1. Department of Earth, Environmental and Planetary Science, Brown University, Providence, USA;2. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, UK;3. NCAR, Boulder, USA;1. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, USA;2. Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, H3A 0B9 CAN, USA;3. Oceanography Division, Naval Research Laboratory (NRL-SSC), Stennis Space Center, Mississippi, USA;4. NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey, USA;5. Physical Oceanography Department, Woods Hole Oceanographic Institution, Woods Hole, USA;1. School of Earth and Atmospherics Sciences, Georgia Institute of Technology, 311 Ferst Dr, Atlanta, GA 30332, USA;2. Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA;3. Departamento de Geociencias y Medio Ambiente, Universidad Nacional de Colombia, Sede Medellín, Colombia;4. Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, USA
Abstract:Fine- and microstructure observations indicate bottom-intensified turbulent dissipation above rough bathymetry associated with internal wave breaking. Simple analytic representations for the depth profile of turbulent dissipation are proposed here under the assumption that the near bottom wavefield is dominated by a baroclinic tide. This scheme is intended for use in numerical models and thus captures only the gross features of detailed solutions to the energy balance of the internal wavefield. The possible sensitivity of the magnitude and vertical variability of the dissipation rate profile to various environmental parameters is discussed. An expression for the diapycnal buoyancy flux is presented that explicitly treats the difference between the height of an isopycnal above the mean bottom and the actual bottom. This returns a diapycnal velocity estimate that is consistent with both tracer observations of downwelling and a basin scale mass budget that requires upwelling.
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