Quasi-geostrophic
An implementation of the Local Ensemble Kalman Filter in a quasi geostrophic model and comparison with 3D-Var
... a quasi-geostrophic mid- latitude, β -plane, finite-difference channel model, periodic in longitude, and with impermeable walls on the north and south ...cycle. Quasi-geostrophic potential ...
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A Semi Lagrangian Type Solver for Two Dimensional Quasi Geostrophic Model on a Sphere
... thod with two-order centered difference scheme for solving two-dimensional quasi- geostrophic equations on a sphere. In our approach, potential vorticity and stream- function are used as prognostic ...
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Impacts of the horizontal and vertical grids on the numerical solutions of the dynamical equations – Part 2: Quasi-geostrophic Rossby modes
... Abstract. We use a normal-mode analysis to investigate the impacts of the horizontal and vertical discretizations on the numerical solutions of the quasi-geostrophic anelastic baroclinic and barotropic ...
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Global existence for the regularized surface Quasi-geostrophic equation and its inviscid limits
... The rest of this article is organized as follows. In Section 2, we present the global existence for the regularized Equation (1.3). In Section 3, we give the regularization results for the regularized model (1.3) and ...
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Ellipsoidal vortices in rotating stratified fluids : beyond the quasi geostrophic approximation
... ‘quasi- geostrophic’ limit, when the flow is weak compared to the background rotation, there exists exact solutions for steadily-rotating ellipsoidal volumes of uniform potential vorticity in an unbounded ...
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Three dimensional quasi geostrophic vortex equilibria with m−fold symmetry
... number, quasi-geostrophic vortices in mutual equilibrium whose centroids lie on a horizontal circular ring; or m + 1 vortices where the additional vortex lies on the vertical ‘central’ axis passing through ...
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Point vortices for inviscid generalized surface quasi-geostrophic models
... The case m = 2 corresponds to the Euler equations, the case m = 1 corresponds to the inviscid surface quasi-geostrophic equations (SQG). In meteorology the inviscid SQG has been derived to model the ...
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Theoretical comparison of subgrid turbulence in atmospheric and oceanic quasi-geostrophic models
... Abstract. Due to the massive disparity between the largest and smallest eddies in the atmosphere and ocean, it is not possible to simulate these flows by explicitly resolving all scales on a computational grid. Instead ...
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Asymptotics and numerics of a family of two-dimensional generalized surface quasi-geostrophic equations
... surface quasi-geostrophic (SQG, hereafter) equation has been attracting attention of many mathematical researchers since the appearance of the seminal papers [1, ...
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The critical merger distance between two co rotating quasi geostrophic vortices
... three-dimensional quasi-geostrophic turbulence, see Hua & Haidvogel ...The quasi-geostrophic (QG) model is the simplest model containing the dominant features of stable stratification and ...
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Existence, stability and formation of baroclinic triples in quasi geostrophic flows
... Hetons are baroclinic vortices able to transport tracers or species, and which have been observed at sea. This paper studies the offset collision of two identical hetons, often result- ing in the formation of a ...
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Quasi geostrophic vortices in compressible atmospheres
... compressible quasi- geostrophic equations in an unbounded vertical domain can be constructed analy- tically using a non-standard separation of variables involving a vertical coordinate and a ...
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On the stability of continuously stratified quasi geostrophic hetons
... Abstract. In this paper we examine the stability of quasi-geostrophic hetons in a stably, continuously stratified fluid. To this purpose we first determinate numerically equilibrium states. Equilibrium ...
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The stability and nonlinear evolution of quasi geostrophic toroidal vortices
... We investigate the linear stability and nonlinear evolution of a three-dimensional toroidal vortex of uniform potential vorticity under the quasi-geostrophic approximation. The torus can undergo a primary ...
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Synchronization and chaos control in a periodically forced, quasi geostrophic, two layer model of baroclinic instability
... a quasi-periodic or chaotic system can significantly alter the behaviour of the ...the Quasi- Biennial Oscillation or Tropical Instability Waves, for ex- ample, and their interaction with annual or ...
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A study of the phase instability of quasi-geostrophic Rossby waves on the infinite -plane to zonal flow perturbations
... the quasi- geostrophic two-layers model ...reduced-gravity quasi-geostrophic “one and a half layer” model, which captures, with more acceptable conciseness, some of the major differences with ...
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A Multiscale Dynamo Model Driven by Quasi-geostrophic Convection
... A convection-driven multiscale dynamo model is developed in the limit of low Rossby number for the plane layer geometry in which the gravity and rotation vectors are aligned. The small-scale fluctuating dynamics are ...
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Models of interacting pairs of thin, quasi geostrophic vortices: steady state solutions and nonlinear stability
... We study pairwise interactions of elliptical quasi-geostrophic (QG) vortices as the limiting case of vanishingly thin uniform potential vorticity ellipsoids. In this limit, the product of the vertical ...
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Impeded inverse energy transfer in the Charney Hasegawa Mima model of quasi geostrophic flows
... large-scale dissipation mechanisms are employed and no steady dynamics are sought since we are primarily interested in the near arrest of the inverse energy cascade in a quasi-steady state. (For an analysis of ...
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The quasi geostrophic ellipsoidal vortex model
... Time evolution of the differences between the ellipsoidal model at various orders m and the full QG dynamics computed by contour dynamics with nlay = 50, see figure 7.. Time evolution of t[r] ...
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