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AbstractThe upwelling diapycnal limb of the ocean’s meridional overturning circulation is driven by divergence of diabatic turbulent buoyancy-fluxes <w’b’> across density surfaces. A global assessment of zonally-averaged internal-wave-driven turbulent diapycnal buoyancy-fluxes from a finescale strain-based parameterization is used to infer mean diapycnal transports in the interior and near the bottom boundary. Bulk interior diabatic transports dominate above 2500-m depth (buoyancies |B| = gγn/ρ0 < 0.267 m s−2, neutral densities γn < 27.9 kg m−3), upwelling at 10-11 Sv (2, 5 and 3-4 Sv in the Indian, Pacific and Atlantic, respectively) but are weak in the abyss. Boundary water-mass transformations peak at 18-25 Sv (4-6, 10-14 and 4-5 Sv in the Indian, Pacific and Atlantic) near buoyancy |B| ~ 0.268 m s−2 (γn ~ 28.1 kg m−3, 4500-m depth) between bottom and lower deep waters, consistent with 20-30 Sv global AABW transport estimates. Interior transports above 2500-m depth fall below inverse estimates which may be consistent with a more adiabatic ocean interior where diapycnal mixing occurs at Southern Hemisphere high-latitude surface density outcrops.
Journal of Physical Oceanography – American Meteorological Society
Published: Sep 7, 2017
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