Physics – Geophysics
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3600d04s&link_type=abstract
Geophysical Research Letters, Volume 36, Issue C1, CiteID L00D04
Physics
Geophysics
2
Marine Geology And Geophysics: Marine Seismics (0935, 7294), Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490), Oceanography: Physical: Internal And Inertial Waves, Exploration Geophysics: Seismic Methods (3025, 7294)
Scientific paper
An improved understanding of the spatial distribution of diapycnal mixing in the oceans is the key to elucidating how meridional overturning circulation is closed. The challenge is to develop techniques which can be used to determine the variation of diapycnal mixing as a function of space and time throughout the oceanic volume. One promising approach exploits seismic reflection imaging of thermohaline structure. We have applied spectral analysis techniques to fine-structure undulations observed on a seismic transect close to the Subantarctic Front in the South Atlantic Ocean. 91 horizontal spectra were fitted using a linear combination of a Garrett-Munk tow spectrum for internal waves and a Batchelor model for turbulence. The fit between theory and observation is excellent and enables us to deduce the spatial variability and context of diapycnal mixing rates, which range from 10-5 to 10-3.5m2s-1.
Hobbs Richard W.
Sheen K. L.
White Neil J.
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