Reflection of Linear Internal Tides from Realistic Topography: The Tasman Continental Slope
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Non |
| Statut de publication | : | Publié |
| Année de publication | : | 2016 |
| Auteurs (8) | : | KLYMAK Jody,m SIMMONS H BRAZNIKOV D KELLY S MACKINNON J,a ALFORD Matthew,h PINKEL R NASH Jonathan |
| Revue scientifique | : | Journal of Physical Oceanography |
| Volume | : | 46 |
| Fascicule | : | 11 |
| Pages | : | 3321-3337 |
| DOI | : | 10.1175/JPO-D-16-0061.1 |
| URL | : | - |
| Abstract | : | The reflection of a low-mode internal tide on the Tasman continental slope is investigated using simulations of realistic and simplified topographies. The slope is supercritical to the internal tide, which should predict a large fraction of the energy reflected. However, the response to the slope is complicated by a number of factors: the incoming beam is confined laterally, it impacts the slope at an angle, there is a roughly cylindrical rise directly offshore of the slope, and a leaky slope-mode wave is excited. These effects are isolated in simulations that simplify the topography. To separate the incident from the reflected signal, a response without the reflector is subtracted from the total response to arrive at a reflected signal. The real slope reflects approximately 65% of themode-1 internal tide asmode 1, less than two-dimensional linear calculations predict, because of the three-dimensional concavity of the topography. It is also less than recent glider estimates, likely as a result of along-slope inhomogeneity. The inhomogeneity of the response comes from the Tasman Rise that diffracts the incoming tidal beam into two beams: one focused along beam and one diffracted to the north. Along-slope inhomogeneity is enhanced by a partially trapped, superinertial slope wave that propagates along the continental slope, locally removing energy from the deep-water internal tide and reradiating it into the deep water farther north. This wave is present even in a simplified, straight slope topography; its character can be predicted from linear resonance theory, and it represents up to 30% of the local energy budget. |
| Mots-clés | : | ENERGETICS; FREQUENCIES; ISLANDS; OCEAN; RIDGE; SEAMOUNTS |
| Commentaire | : | Times Cited in Web of Science Core Collection: 30 |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Klymak JM, Simmons H, Braznikov D, Kelly S, MacKinnon JA, Alford MH, Pinkel R, Nash J (2016) Reflection of Linear Internal Tides from Realistic Topography: The Tasman Continental Slope. J Phys Oceanogr 46: 3321-3337 | doi: 10.1175/JPO-D-16-0061.1
|