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Wave-tracking Experiment to Assess NLIW Generation, Structure, Evolution and Dissipation

Moum. Wave-tracking Experiment to Assess NLIW Generation, Structure, Evolution and Dissipation Detection of NLIW by Seafloor Pressure Measurement. bottom landers with high-res pressure sensors. Named Waves Tracked Alfred Betty Carlton Debby Elvin Florence George Holly

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Wave-tracking Experiment to Assess NLIW Generation, Structure, Evolution and Dissipation

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  1. Moum • Wave-tracking Experiment to Assess NLIW • Generation, Structure, Evolution and Dissipation • Detection of NLIW by Seafloor Pressure Measurement bottom landers with high-res pressure sensors

  2. Named Waves Tracked • Alfred • Betty • Carlton • Debby • Elvin • Florence • George • Holly • Isaac • Jasmine • Kevin • Lola • Mika • Natalie • Oscar • … • Anya NLIWI/SW06 R/V Oceanus 30 July – 26 Aug 2006 Science Party Jim Moum OSU Alexander Perlin OSU Greg Avicola OSU Emily ShroyerOSU Sam Kelly OSU Mike Neeley-Brown OSU Ray Kreth OSU Karen Fisher Los Alamos Dezhang Chu WHOI Doris Leong Dalhousie Paul Heslinga Falmouth Academy

  3. approaching wave train – < 5 kt winds view from flying bridge

  4. Mika

  5. group-group interactions wave-wave interactions Tonya / wave group interaction

  6. SW37 SW38 SW39 SW40

  7. Oops! accidental sound source 02 August 2006 23:04:54

  8. high turbulence at interface interfacial jets?

  9. Shipboard profiling measurements

  10. Varicose wave Jasmine

  11. Seafloor pressure measurements of nonlinear internal waves, submitted to J.Phys.Oceanogr., December 2006 (Moum & Nash)

  12. Emily Shroyer Knorr Shoaling nonlinear internal waves: transition from depression to elevation waves. in prep, J.Phys.Oceanogr. (Shroyer, Moum & Nash) Knorr

  13. Wave Florence successive transits along 300/120, 0.5 nm SW of main array axis 120 kHz backscatter

  14. Wave Florence successive transits along 300/120, 0.5 nm SW of main array axis 120 kHz backscatter pre-wave state

  15. Wave Florence successive transits along 300/120, 0.5 nm SW of main array axis 1200 kHz backscatter

  16. Wave Florence

  17. Wave Florence

  18. Wave Florence

  19. Wave Florence

  20. Wave Florence

  21. Wave Florence

  22. Florence time/position diagram mean propagation speed 0.90 ms-1 Florence’s speed projected backward in time Wave Florence We project the measured locations of the wave backward in space/time using the wave speed determined from the slope of the wave’s x-t plot to get an idea of what/where the wave was before it was clearly a wave. The result is the pre-wave state indicated several slides previous to this. This is helping us to decide what to look for in the generation region.

  23. Wave Florence pre-wave state

  24. Summary Topics of Interest • wave pressure signature – submitted (Moum/Nash) • shoaling / sign change – in prep. (Shroyer/Moum/Nash) • physical structure – interfacial jets? • energetics: evolution / transport / dissipation • generation: bore / wave transition • varicose waves • wave-wave / group-group interactions

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