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Selective Decay of Enstrophy and the Excitation of Barotropic Waves in a Channel
Publisher: American Meteorological Society
Abstract: If the momentum, energy and circulation of a fluid in a periodic, quasi-geostrophic, ?-plane channel are specified, then there is a minimum enstrophy implied. This minimum enstrophy flow is obtained using the calculus of ...
The Role of Western Boundary Layers in Gyre Scale Ocean Mixing
Publisher: American Meteorological Society
Abstract: A variety of two-dimensional advection-diffusion models are investigated analytically with the goal of understanding the role of boundary layer in gyre-scale ocean mixing. It is assumed throughout that the Péclet number ...
Topographic Rectification of Tidal Currents
Publisher: American Meteorological Society
Abstract: The rectification of oscillatory tidal currents on the sloping sides of a low submarine bank is discussed using the moment method. This method has been previously used in shear dispersion studies where it is used to analyze ...
Density Compensated Thermohaline Gradients and Diapycnal Fluxes in the Mixed Layer
Publisher: American Meteorological Society
Abstract: Density-compensated temperature and salinity gradients are often observed in mixed layer fronts. A possible explanation Of this Observation is that there is a systematic relation between the ?strength? of a front, defined ...
Baroclinic Instability and Thermohaline Gradient Alignment in the Mixed Layer
Publisher: American Meteorological Society
Abstract: The density of the mixed layer (ML) is approximately uniform in the vertical, but there are dynamically important horizontal gradients. The subinertial mixed layer (SML) approximation is a small Rossby number filtering of ...
Zonostrophic Instability
Publisher: American Meteorological Society
Abstract: onostrophic instability leads to the spontaneous emergence of zonal jets on a ? plane from a jetless basic-state flow that is damped by bottom drag and driven by a random body force. Decomposing the barotropic vorticity ...
An Upper Bound on the Size of Sub-mesoscale Coherent Vortices
Publisher: American Meteorological Society
Abstract: Laboratory experiments show that ageostrophic instability can ?break up? a parallel flow into a sequence of axisymmetric eddies. This is a plausible scenario for the generation of sub-mesoscale coherent Vortices (SCVs). ...
Reynolds Stress and Eddy Diffusivity of β-Plane Shear Flows
Publisher: American Meteorological Society
Abstract: he Reynolds stress induced by anisotropically forcing an unbounded Couette flow, with uniform shear ?, on a ? plane, is calculated in conjunction with the eddy diffusivity of a coevolving passive tracer. The flow is damped ...
Ventilation, Potential-Vorticity Homogenization and the Structure of the Ocean Circulation
Publisher: American Meteorological Society
Abstract: A model for the vertical structure of the oceanic circulation is presented that combines elements of the theory of the ventilated thermocline, given by Luyten, Pedlosky and Stommel, with the theory of Rhines and Young for ...