Seasonal variation of turbulent diapycnal mixing in the northwestern Pacific stirred by wind stress

Details Seasonal variation of turbulent diapycnal mixing in the northwestern Pacific stirred by wind stress Seasonal variation of turbulent diapycnal mixing in the northwestern Pacific stirred by wind stress

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3723604j&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 23, CiteID L23604

Physics

1

Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490), Oceanography: Physical: Fine Structure And Microstructure, Oceanography: Physical: General Circulation (1218, 1222), Oceanography: Physical: Upper Ocean And Mixed Layer Processes, Oceanography: General: General Or Miscellaneous

Scientific paper

Profiles of potential density obtained from CTD measurements along the northwestern Pacific section at 137°E are used to estimate both mean and seasonal variations of turbulent diapycnal mixing based on both a Thorpe-scale method and a finescale parameterization method. In general, away from the bottom, the estimated mean value along this section is about O(10-4 m2/s), indicating much stronger mixing in the Northwestern Pacific than in the stratified mid-latitude interior ocean. It is further found that the diffusivity can even exceed 10-4 m2/s around the rough topography. The turbulent diapycnal mixing in the upper ocean also displays a distinct seasonal variation with the amplitude decreasing with depth, bearing a statistically significant correlation with surface wind stress forcing. Our study here provides evidence for the important role of energy input from wind stress in sustaining the deep ocean mixing.

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