Global energy dissipation rate of deep-ocean low-frequency flows by quadratic bottom boundary layer drag: Computations from current-meter data

Details Global energy dissipation rate of deep-ocean low-frequency flows by quadratic bottom boundary layer drag: Computations from current-meter data Global energy dissipation rate of deep-ocean low-frequency flows by quadratic bottom boundary layer drag: Computations from current-meter data

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3509606s&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 9, CiteID L09606

Physics

11

Oceanography: Physical: Eddies And Mesoscale Processes, Oceanography: Physical: Currents, Oceanography: Physical: General Circulation (1218, 1222), Oceanography: Physical: Western Boundary Currents

Scientific paper

The global energy dissipation rate of deep-ocean low-frequency flows by quadratic bottom boundary layer drag is estimated in three ways. First, an average over the dissipations computed from the near-bottom velocities recorded by 290 moored current meters is multiplied by the World Ocean area. Second, near-global maps of surface velocities derived from satellite altimetry data are used to estimate the bias due to the sparse spatial coverage of the moorings. Third, a relationship between bottom and surface flows, computed over the mooring locations, is used to estimate global maps of bottom flows from the surface data. All three methods suggest that at least 0.2 TW of the wind-power input into geostrophic flows is dissipated in deep water by quadratic bottom drag. Implications for the oceanic overturning circulation, and for oceanic mesoscale eddy dynamics, are briefly discussed.

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