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Baroclinic and Barotropic Instabilities of Coastal Currents
Baroclinic Coastal Currents Barotropic Instabilities
2009/2/9
The two-layer baroclinic instability model of the California Undercurrent from Mysak (1977) is modified to investigate the effects of the lateral boundary conditions on the stability properties of the...
Radiating Instabilities of Thin Baroclinic Jets
Radiating Instabilities Thin Baroclinic Jets
2009/2/6
The linear stability of thin, quasi-geostrophic, two-layer zonal jets on the β-plane is considered. The meridional structure of the jets is approximated in such a way as to allow an exact dispersion r...
Mixed Instabilities in the Gulf Stream over the Continental Slope
Gulf Stream Continental Slope
2009/1/14
A numerical model study is presented of the unstable normal modes of oscillation of a boundary current. The model background current approximates the Gulf Stream south of Cape Hatteras, North Carolina...
Frontal Instabilities of Baroclinic Oceanic Currents with Applications to the Gulf Stream
Gulf Stream frontal instability Baroclinic Oceanic Currents
2009/1/7
The frontal instability of major baroclinic ocean currents such as the Gulf Stream is numerically studied here, using a three-dimensional, primitive-equation model. The model current is driven by a bu...
Vertical Structure of Midlatitude Mesoscale Instabilities
Vertical Structure Midlatitude Mesoscale Instabilities
2009/1/6
Instability processes in frontal jet regions outside the western boundary currents are examined for their ability to produce mesoscale variability comparable to that observed in the open ocean. The im...
Observations of Frontal Instabilities on an Upwelling Filament
Frontal Instabilities Upwelling Filament
2009/1/6
Frontal instabilities were observed along a density front on the cyclonic boundary of an upwelling filament that formed north of Pt. Arguello, California in October 1983. Observations of the instabili...
A Model of Gulf Stream Frontal Instabilities, Meanders and Eddies along the Continental Slope
Gulf Stream Continental Slope
2009/1/5
For a simplified model of the Gulf Stream front along a vertical-walled continental slope of a constant-depth ocean basin, the dynamics governing frontal instabilities, meanders, and eddies depend pri...
Finite-Wavelength Instabilities of a Coupled Density Front
Finite-Wavelength Instabilities CoupledDensity Front
2008/12/27
Finite-wavelength instabilities of a coupled density front with zero potential vorticity are found for the single-layer and the two-layer problems. These instabilities result from the resonance betwee...
Viscous Instabilities in the Western Boundary Layer
Viscous Instabilities Western Boundary Layer parallel flow
2008/12/24
The stability of the western boundary layer is studied by idealizing it as a parallel flow and solving the Orr–Sommerfeld equation, generalized to include the gradient of planetary vorticity. The crit...
Shear Instabilities in the Longshore Current：A Comparison of Observation and Theory
Longshore Current Low-frequency
2008/12/22
Low-frequency (<0.01 Hz) oscillations in the surf zone longshore current with wavelengths too small (<300 m) to be surface gravity waves were observed during the 1986 SUPERDUCK experiment at Duck, Nor...
Secondary Instabilities in Langmuir Circulations
Secondary Instabilities Langmuir Circulations
2008/12/12
Finite-amplitude Langmuir circulation in the form of rolls parallel to the wind direction is shown to be subject to three-dimensional instability under certain circumstances. Density stratification is...
Baroclinic–Barotropic Instabilities of the Gulf Stream Extension
Baroclinic–Barotropic Instabilities Gulf Stream Extension
2008/12/11
In this paper, the baroclinic-barotropic instability of the Gulf Stream is studied numerically. The quasigeo-strophic potential vorticity equation is linearized around the mean flow, which is modeled ...
A Kinetic Energy Budget and Internal Instabilities in the Fine Resolution Antarctic Model
Kinetic Energy Budget Fine Resolution Antarctic Model Antarctic Circumpolar Current
2008/11/11
An energy analysis of the Fine Resolution Antarctic Model (FRAM) reveals the instability processes in the model. The main source of time-mean kinetic energy is the wind stress and the main sink is tra...
Coupled Kelvin-Wave and Mirage-Wave Instabilities in Semigeostrophic Dynamics
Coupled Kelvin-Wave Semigeostrophic Dynamics Mirage-Wave Instabilities
2008/10/31
A weak instability mode, associated with phase-locked counterpropagating coastal Kelvin waves in horizontal anticyclonic shear, is found in the semigeostrophic (SG) equations for stratified flow in a ...
On Symmetric Instabilities in Oceanic Bottom Boundary Layers
Symmetric Instabilities Oceanic Bottom Boundary Layers
2008/10/28
Model studies of two-dimensional, time-dependent, wind-forced, stratified downwelling circulation on the continental shelf have shown that the near-bottom offshore flow can develop time- and space-dep...