Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Barotropic model"”.
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Barotropic Model Simulations of Low-Frequency Variability
… maintaining the low-frequency variability in the barotropic system under subcritical condition. Stochastically forced experiments are conducted using spatially homogeneous forcing. In the weakly subcritical cases, the model produces spatially and temporally coherent variability, with the first two …
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Generalized Barotropic Models for Studying the Low -Frequency Variability of the Extratropical Atmosphere
Finally, the generalized model is scrutinized in terms of its normal, adjoint, optimal and singular modes. It is found that the modes of the empirically modified model are more stable than the ones of the barotropic model. Also the modified barotropic optimal modes are more difficult to excite than …
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Global barotropic variability of the ocean in response to atmospheric forcing based on multichannel regression and Kalman filter techniques
… can be adequately described by linear barotropic ocean models: the multichannel regression and the optimal smoothing techniques. We start with the simplest linear vorticity balance and continue by building a hierarchy of more complicated models by including effects of topography and …
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Geostrophic vortex dynamics
… dynamics to the quasigeostrophic two layer model, we have proposed and solved a number of fundamental problems in the dynamics of rotating and stratified vorticity fields. A variety of rotating and translating potential vorticity equilibria (V-states) in one and two layers have been …
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Satellite AVHRR observations of the intensification of the shelf break current during an upwelling event off Vancouver Island
… and 100 cm/s calculated using a time-independent barotropic model. Results indicate that wind and topography play important roles in the upwelling response, and under the right conditions, AVHRR observations of SST are representative of dynamical processes within the ocean. The band of cold water …
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Slope/shelf circulation and cross-slope/shelf transport out of a bay driven by eddies from the open ocean
… of topographic waves, are identified in barotropic vortex-escarpment interactions. The two mechanisms advect the potential vorticity (PV) perturbations in opposite directions in anticyclone-induced interactions but in the same direction in cyclone-induced interactions, resulting in …
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Non-linear saturation of vertically propagating Rossby waves
… abstract context, through a variety of simple model studies. We thus consider the cases of a topographically forced barotropic beta plane channel model, of vertical propagation through a three-dimensional beta plane channel model, and of a polar coordinate model with realistic basic state and …
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The dynamic role of ridges in a β-plane channel : towards understanding the dynamics of large scale circulation in the Southern Ocean
… in both linear homogeneous and stratified layer models in the presence of either wind stress (Chapters 2, 3, 4, and 6) or buoyancy forcing (Chapter 5). In these studies, the structure of the geostrophic contour plays a fundamental role, and the role of bottom topography is looked at from two …
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On the propagation of free topographic Rossby waves near continental margins
… pressure for about six months. An analytical model has been constructed to study the propagation of free topographic Rossby waves in an infinite wedge filled with a uniformly stratified fluid. The problem is found after some coordinate transformations to be identical to the corresponding …
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Uncertainty Quantification in ocean state estimation
… optimal combination of ocean general circulation model (GCM) with diverse ocean observations. The estimation system is based on the "adjoint method" solution of an unconstrained least-squares optimization problem formulated with the method of Lagrange multipliers for fitting the dynamical ocean …
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Uncertainty quantification in ocean state estimation
… optimal combination of ocean general circulation model (GCM) with diverse ocean observations. The estimation system is based on the "adjoint method" solution of an unconstrained least-squares optimization problem formulated with the method of Lagrange multipliers for fitting the dynamical ocean …
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Flow over finite isolated topography
One and two layer models are used to study flow over axisymmetric isolated topography. Inviscid or nearly inviscid flow in which non-linear effects have order one importance is considered, and both the effects of β and finite topography are included. A one-layer quasi-geostrophic model is used to …