Tidally Modulated Internal Hydraulic Flow and Energetics in the Central Canadian Arctic Archipelago
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Non |
| Statut de publication | : | Publié |
| Année de publication | : | 2018 |
| Auteurs (4) | : | HUGHES K,g KLYMAK Jody,m WILLIAMS W,j MELLING H |
| Revue scientifique | : | Journal of Geophysical Research-Oceans |
| Volume | : | 123 |
| Fascicule | : | 8 |
| Pages | : | 5210-5229 |
| DOI | : | 10.1029/2018JC013770 |
| URL | : | - |
| Abstract | : | The Canadian Arctic Archipelago is a key conduit for comparatively fresh Arctic waters flowing to the Atlantic. Model estimates of the freshwater outflow, which is strongly correlated with the volume flux, contain major uncertainties because most existing models exclude tides, marginally resolve the internal Rossby radius, or both. At the same time, barotropic tidal models preclude stratified flow effects. Here we assess the relative importance of barotropic and baroclinic processes to water mass transformation, friction, and energy losses motivated by processes observed in a fine-scale survey in the central Archipelago. A sharp separation of warmed Canada Basin water and locally formed water is observed over a long sill in a narrow channel and coincides with an internal hydraulic jump caused by the mean flow. Tidal currents, however, modulate the jump, as demonstrated by both scale analysis and a two-dimensional simulation. The jump, together with internal tides propagating as Kelvin waves, leads to isopycnal displacements up to 50m. The generation of these internal Kelvin waves has a leading-order role in a regional energy budget. It is small, however, relative to bottom boundary layer dissipation, which accounts for an estimated 50% of the total tidal energy losses. Consequently, adding tides needs to be a priority for regional models. |
| Mots-clés | : | BARROW STRAIT; Canadian Archipelago; CIRCULATION; CONTRACTION; energy budget; hydraulics; Kelvin wave; KNIGHT INLET SILL; MAXIMAL 2-LAYER EXCHANGE; Moving Vessel Profiler; OCEAN; STRATIFIED FLOW; TIDES; TOPOGRAPHY; WAVES |
| Commentaire | : | Times Cited in Web of Science Core Collection: 5 |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Hughes KG, Klymak JM, Williams WJ, Melling H (2018) Tidally Modulated Internal Hydraulic Flow and Energetics in the Central Canadian Arctic Archipelago. J Geophys Res-Oceans 123: 5210-5229 | doi: 10.1029/2018JC013770
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