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Modeling Semidiurnal Internal Tide Variability in the Southern California Bight

Modeling Semidiurnal Internal Tide Variability in the Southern California Bight
Modeling Semidiurnal Internal Tide Variability in the Southern California Bight
The Regional Oceanic Modeling System (ROMS) is applied in a nested configuration with realistic forcing to the Southern California Bight (SCB) to analyze the variability in semidiurnal internal wave generation and propagation. The SCB has a complex topography with supercritical slopes that generate linear internal waves at the forcing frequency. The model predicts the observed barotropic and baroclinic tides reasonably well, although the observed baroclinic tides feature slightly larger amplitudes. The strongest semidiurnal barotropic to baroclinic energy conversion occurs on a steep sill slope of the 1900-m-deep Santa Cruz Basin. This causes a forced, near-resonant, semidiurnal Poincaré wave that rotates clockwise in the basin and is of the first mode along the radial, azimuthal, and vertical directions. The associated tidal-mean, depth-integrated energy fluxes and isotherm oscillation amplitudes in the basin reach maximum values of about 5 kW m?1 and 100 m and are strongly modulated by the spring–neap cycle. Most energy is locally dissipated, and only 10% escapes the basin. The baroclinic energy in the remaining basins is orders of magnitudes smaller. High-resolution coastal models are important in locating overlooked mixing hotspots such as the Santa Cruz Basin. These mixing hotspots may be important for ocean mixing and the overturning circulation.

0022-3670
62-77
Buijsman, M.C.
34e571e8-f11f-47f5-9297-cde570e7af90
Uchiyama, Y.
97460801-24aa-4608-aa17-e4c4fa276f60
McWilliams, J.C.
845b39d5-d3f8-44fc-9332-3235c8d405c3
Hill-Lindsay, C.R.
12d4311b-c000-491a-9432-5c35f4ef0f18
Buijsman, M.C.
34e571e8-f11f-47f5-9297-cde570e7af90
Uchiyama, Y.
97460801-24aa-4608-aa17-e4c4fa276f60
McWilliams, J.C.
845b39d5-d3f8-44fc-9332-3235c8d405c3
Hill-Lindsay, C.R.
12d4311b-c000-491a-9432-5c35f4ef0f18

Buijsman, M.C., Uchiyama, Y., McWilliams, J.C. and Hill-Lindsay, C.R. (2012) Modeling Semidiurnal Internal Tide Variability in the Southern California Bight. Journal of Physical Oceanography, 42 (1), 62-77. (doi:10.1175/2011JPO4597.1).

Record type: Article

Abstract

The Regional Oceanic Modeling System (ROMS) is applied in a nested configuration with realistic forcing to the Southern California Bight (SCB) to analyze the variability in semidiurnal internal wave generation and propagation. The SCB has a complex topography with supercritical slopes that generate linear internal waves at the forcing frequency. The model predicts the observed barotropic and baroclinic tides reasonably well, although the observed baroclinic tides feature slightly larger amplitudes. The strongest semidiurnal barotropic to baroclinic energy conversion occurs on a steep sill slope of the 1900-m-deep Santa Cruz Basin. This causes a forced, near-resonant, semidiurnal Poincaré wave that rotates clockwise in the basin and is of the first mode along the radial, azimuthal, and vertical directions. The associated tidal-mean, depth-integrated energy fluxes and isotherm oscillation amplitudes in the basin reach maximum values of about 5 kW m?1 and 100 m and are strongly modulated by the spring–neap cycle. Most energy is locally dissipated, and only 10% escapes the basin. The baroclinic energy in the remaining basins is orders of magnitudes smaller. High-resolution coastal models are important in locating overlooked mixing hotspots such as the Santa Cruz Basin. These mixing hotspots may be important for ocean mixing and the overturning circulation.

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Published date: 2012
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 340319
URI: https://eprints.soton.ac.uk/id/eprint/340319
ISSN: 0022-3670
PURE UUID: 14249545-5657-48b1-b151-87c4d63bcfbc

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Date deposited: 18 Jun 2012 15:20
Last modified: 16 Sep 2019 18:39

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Contributors

Author: M.C. Buijsman
Author: Y. Uchiyama
Author: J.C. McWilliams
Author: C.R. Hill-Lindsay

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