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Showing 1 to 14 of 14 for “"Baroclinicity"”.
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Interactions between clouds and atmospheric circulation in the extratropics
… consistent with the effect of midlatitude baroclinicity changes on eddy activity. This means that an accurate representation of clouds and their radiative effects is essential to correctly portray the mean circulation. In the context of greenhouse gas–forced change, we demonstrate that …
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A model of a Mediterranean salt lens in external shear
… of the external vertical shear and the core baroclinicity. A numerical algorithm which is a generalization of the contour dynamics technique to stratified quasigeostrophic flow is used to extend the linear results into the nonlinear regime. This numerical analysis allows a determination of …
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Formation and Development of Diabatic Rossby Vortices in a 10-Year Climatology
… published literature, confirming that moisture, baroclinicity and the diabatic generation of eddy available potential energy are essential to DRV formation and development. Upon inspection of the interaction between DRVs and the dynamic tropopause (DT), nine (30%) of the 31 explosively deepened …
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Equilibration of an atmosphere by geostrophic turbulence
… flow, and derive scaling relations for both the baroclinicity and vertical stratification of the equilibrated state.
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The Effects of Diabatic Heating on Storm Track Dynamics
… while radiative relaxation serves to maintain baroclinicity. Surface heating suppresses storm track amplitude in contrast to condensational heating which enhances the storm track amplitudes. Both heating processes localize storm tracks over oceans by attenuating eddy variance over continents. …
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On quasi-periodic Baroclinic variability in the extratropical circulation
… be modeled as a simple linear feedback between baroclinicity and eddy heat fluxes. The periodicity seen on larger scales is a product of differential advection rates affecting the development of spatially overlapping, out-of-phase anomalies. The large-scale nature of the periodic behavior, …
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On the role of topography and of boundary forcing in the ocean circulation
… therefore the phenomena that rely strongly on baroclinicity are discouraged. On the other hand, reduction of the dissipation leads to the onset of a strong recirculating, inertial gyre which, although confined in space, affects the global properties of the flow. In the second part of the thesis …
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Event characteristics of intra-seasonal climate circulations
… of angular momentum. The resulting increase in baroclinicity in the South Atlantic Ocean then disrupts rainfall over South Africa through the advection of dry air from the west by the vertical-mean wind component. General circulation models are shown to capture inter-annual variability such that …
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Linear normal mode analysis of baroclinic instability in a meridional channel
Numerical solutions of the unstable, growing modes are found for the two-layer inviscid quasigeostrophic equations in a meridional channel. A steady mean flow in the N-S direction is imposed in the upper layer, and it is assumed that changes in planetary vorticity following this mean flow are …
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Variability of water masses and circulation in the subtropical North Atlantic
… through BPT, due to "JEBAR" (the Joint Effect of Baroclinicity And Relief). The Gulf Stream intensification decreases after May as lateral eddy mixing weakens anomalous cross-stream pressure gradients. This eddy mixing is parameterized in the model by a layer thickness diffusion velocity, …
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Baroclinic instability of a meridionally varying basic state
Several problems are addressed herein. They are loosely connected by the theme of resonant triad interactions. The main topic is the finite amplitude evolution of weakly unstable, linear eigenmodes in a meridionally varying version of Phillips' two-layer model. It is shown in chapter four that …
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Nonlinear Solutions to a Two-Layer Quasi-Geostrophic Model of the Gulf Stream
<p>The Gulf Stream shows a large meander off Cape Hatteras. This is driven by an energy conversion process known as baroclinic instability and observations suggest that nonlinearity is an important part in this process. In order to understand the fundamental role of nonlinearity in baroclinic …
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Instabilities and radiation of thin, baroclinic jets
Oceanic fluctuations are dependent on geographical location. Near intense currents, the eddy field is highly energetic and has broad meridional extent. It is likely that the energy arises from instabilities of the intense current. However, the meridional extent of the linearly most unstable modes …
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Generation of mid-ocean eddies : the local baroclinic instability hypothesis
The plausibility of local baroclinic instability as a generation mechanism for midocean mesoscale eddies is examined with a two-layer, quasi-geostrophic (QG) model forced by an imposed, horizontally homogeneous, vertically sheared mean flow and dissipated through bottom Ekman friction, Explanations …