A coupled-mode shallow-water model for tidal analysis : internal tide reflection and refraction by the Gulf Stream
Kelly, Samuel M.
Lermusiaux, Pierre F. J.
Duda, Timothy F.
Haley, Patrick J.
MetadataShow full item record
KeywordContinental shelf/slope; Inertia-gravity waves; Internal waves; Boundary currents; Tides; Baroclinic models
A hydrostatic, coupled-mode, shallow-water model (CSW) is described and used to diagnose and simulate tidal dynamics in the greater Mid-Atlantic Bight region. The reduced-physics model incorporates realistic stratification and topography, internal tide forcing from a priori estimates of the surface tide, and advection terms that describe first-order interactions of internal tides with slowly varying mean flow and mean buoyancy fields and their respective shear. The model is validated via comparisons with semianalytic models and nonlinear primitive equation models in several idealized and realistic simulations that include internal tide interactions with topography and mean flows. Then, 24 simulations of internal tide generation and propagation in the greater Mid-Atlantic Bight region are used to diagnose significant internal tide interactions with the Gulf Stream. The simulations indicate that locally generated mode-one internal tides refract and/or reflect at the Gulf Stream. The redirected internal tides often reappear at the shelf break, where their onshore energy fluxes are intermittent (i.e., noncoherent with surface tide) because meanders in the Gulf Stream alter their precise location, phase, and amplitude. These results provide an explanation for anomalous onshore energy fluxes that were previously observed at the New Jersey shelf break and linked to the irregular generation of nonlinear internal waves.
Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 46 (2016): 3661-3679, doi:10.1175/JPO-D-16-0018.1.
The publisher requires that this item be embargoed until 2017-06-14. Please check back after 2017-06-14.
Showing items related by title, author, creator and subject.
Mercier, Matthieu J.; Gostiaux, Louis; Helfrich, Karl R.; Sommeria, Joel; Viboud, Samuel; Didelle, Henri; Ghaemsaidi, Sasan J.; Dauxois, Thierry; Peacock, Thomas (John Wiley & Sons, 2013-11-04)The complex double-ridge system in the Luzon Strait in the South China Sea (SCS) is one of the strongest sources of internal tides in the oceans, associated with which are some of the largest amplitude internal solitary ...
Frank, Scott D.; Badiey, Mohsen; Lynch, James F.; Siegmann, William L. (Acoustical Society of America, 2004-12)To investigate acoustic effects of nonlinear internal waves, the two southwest tracks of the SWARM 95 experiment are considered. An airgun source produced broadband acoustic signals while a packet of large nonlinear internal ...
Measurement and modeling of three-dimensional sound intensity variations due to shallow-water internal waves Badiey, Mohsen; Katsnelson, Boris G.; Lynch, James F.; Pereselkov, Serguey; Siegmann, William L. (Acoustical Society of America, 2005-02)Broadband acoustic data (30–160 Hz) from the SWARM'95 experiment are analyzed to investigate acoustic signal variability in the presence of ocean internal waves. Temporal variations in the intensity of the received signals ...