Internal Bores and Breaking Internal Tides on the Oregon Continental Slope Public Deposited

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  • Observations of breaking internal tides on the Oregon continental slope during a 40-day deployment of 5 moorings along 43°12'N are presented. Remotely generated internal tides shoal onto the slope, steepen, break, and form turbulent bores that propagate upslope independently of the internal tide. A high-resolution snapshot of a single bore is captured from lowered acoustic Doppler current profilers (LADCP)/CTD profiles in a 25-h time series at 1200 m. The bore is cold, salty, over 100 m tall, and has a turbulent head where instantaneous dissipation rates are enhanced (ε > 10⁻⁶ W kg⁻¹) and sediment is resuspended. At the two deepest slope moorings (1452 and 1780 m), similar borelike phenomena are observed in near-bottom high-resolution temperature time series. Mean dissipation rates and diapycnal diffusivities increase by a factor of 2 when bores are present (ε[superscript -bores] > 10⁻8 W kg⁻¹ and K [superscript over bar (bores)(rho)] > 10⁻³ m s⁻¹) and observed internal tides are energetic enough to drive these enhanced dissipation rates. Globally, the authors estimate an average of 1.3 kW m⁻¹ of internal tide energy flux is directed onto continental slopes. On the Oregon slope, internal tide fluxes are smaller, suggesting that it is a relatively weak internal tide sink. Mixing associated with the breaking of internal tides is therefore likely to be larger on other continental slopes.
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  • Martini, K. I., Alford, M. H., Kunze, E., Kelly, S. M., & Nash, J. D. (2013). Internal bores and breaking internal tides on the oregon continental slope. Journal of Physical Oceanography, 43(1), 120-139. doi: 10.1175/JPO-D-12-030.1
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  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2013-03-04T19:26:37Z No. of bitstreams: 1 KellySamuelMEarthOceanAtmosphericSciencesInternalBoresBreaking.pdf: 5586210 bytes, checksum: 97ba28ff85c19ac2cad57ca5c95a590b (MD5)
  • description.provenance : Made available in DSpace on 2013-03-04T19:26:37Z (GMT). No. of bitstreams: 1 KellySamuelMEarthOceanAtmosphericSciencesInternalBoresBreaking.pdf: 5586210 bytes, checksum: 97ba28ff85c19ac2cad57ca5c95a590b (MD5) Previous issue date: 2013-01

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