Record Details
Internal Bores and Breaking Internal Tides on the Oregon Continental Slope
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Internal Bores and Breaking Internal Tides on the Oregon Continental Slope |
| Names |
Martini, Kim I.
(creator) Alford, Matthew H. (creator) Kunze, Eric (creator) Kelly, Samuel M. (creator) Nash, Jonathan D. (creator) |
| Date Issued | 2013-01 (iso8601) |
| Note | This is the publisher’s final pdf. The published article is copyrighted by the American Meteorological Society and can be found at: http://www.ametsoc.org/. |
| Abstract | 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. |
| Genre | Article |
| Topic | Monterey Submarine Canyon |
| Identifier | 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 |
