Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ....
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Transcript of Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ....
![Page 1: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/1.jpg)
Internal Tides, Mixing and the Bottom Boundary
Layer
Internal Tides, Mixing and the Bottom Boundary
Layer
James Girton and Eric KunzeAPL/UW and Univ. Victoria
James Girton and Eric KunzeAPL/UW and Univ. Victoria
![Page 2: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/2.jpg)
Monterey Canyon Internal TidesMonterey Canyon Internal Tides
From Kunze, Rosenfeld, Carter, and Gregg (JPO 2002)From Kunze, Rosenfeld, Carter, and Gregg (JPO 2002)
![Page 3: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/3.jpg)
Beams and Flux DivergenceBeams and Flux Divergence
From Kunze, Rosenfeld, Carter, and Gregg (JPO 2002)From Kunze, Rosenfeld, Carter, and Gregg (JPO 2002)
![Page 4: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/4.jpg)
Critical ReflectionCritical Reflection
From Nash, Kunze, Toole, and Schmitt (JPO 2004)From Nash, Kunze, Toole, and Schmitt (JPO 2004)
![Page 5: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/5.jpg)
Internal wave breaking mixes stratified fluid near boundary
Successive mixing events and subsequent collapse lead to gradual dispersal of boundary layer fluid away from margin
Fluorescein-dyed boundary layer fluid spreading into the interior.
Shadowgraph image: subcritical internal wave breaking against a sloping boundary.
Bottom Boundary MixingBottom Boundary Mixing
From McPhee-Shaw and Kunze (JGR 2002)From McPhee-Shaw and Kunze (JGR 2002)
![Page 6: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/6.jpg)
Flux Co-SpectraFlux Co-Spectra
k co-S[u’p’](k)
k co-S[w’p’](k)
kin
krefl
krefl
kin
kin krefl kin krefl
k co-S[u’p’](k)
k co-S[w’p’](k)
kin
krefl
krefl
kin
kin krefl kin krefl
![Page 7: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/7.jpg)
BBL Bores in the CanyonBBL Bores in the Canyon
From Rosenfeld et al (‘Aha 1999)From Rosenfeld et al (‘Aha 1999)
![Page 8: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/8.jpg)
Survey BoxSurvey Box 8 occupations of 9 stations (72 XCPs) over 12.4 hours, followed by microstructure time-series.
5 km 5 km box, resolves M2 and M4 harmonic.
Additional 1/2-hourly XCP+microstructure time-series for 12.4 hours at one spot to resolve high-frequency variability
Max XCP depth = 2000 m; profiles to 1 m above bottom
![Page 9: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/9.jpg)
Processes/ObservablesProcesses/Observables
• Energy flux divergence vs. local dissipation• Near-critical reflection (bispectra)• Bottom boundary-layer stress and bores• Stratification flux from boundary
• Nonlinearity of semidiurnal tide (M4)
• Impact of wave-field coherence on mixing parameterizations
• Energy flux divergence vs. local dissipation• Near-critical reflection (bispectra)• Bottom boundary-layer stress and bores• Stratification flux from boundary
• Nonlinearity of semidiurnal tide (M4)
• Impact of wave-field coherence on mixing parameterizations
![Page 10: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/10.jpg)
TPXO Surface TidesTPXO Surface Tides
From Klymak and Pinkel proposalFrom Klymak and Pinkel proposal
![Page 11: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/11.jpg)
Now Where?Now Where?
• Slope North of Bay• Corrugated Topography• Submarine Fan• Broad Ridge South of Bay
• Slope North of Bay• Corrugated Topography• Submarine Fan• Broad Ridge South of Bay
![Page 12: Internal Tides, Mixing and the Bottom Boundary Layer James Girton and Eric Kunze APL/UW and Univ. Victoria James Girton and Eric Kunze APL/UW and Univ.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d545503460f94a30c3b/html5/thumbnails/12.jpg)
Additional Proposed Work (NSF)Additional Proposed Work (NSF)
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Timing/Location CriteriaTiming/Location Criteria
• 3 cycles of the semidiurnal tide (close to spring)
• Less than 2000 m water depth• Probably site survey near FLIP• Strong internal tides and 2-D geometry
preferred
• 3 cycles of the semidiurnal tide (close to spring)
• Less than 2000 m water depth• Probably site survey near FLIP• Strong internal tides and 2-D geometry
preferred