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A Tabletop Demonstration of Atmospheric Dynamics:Baroclinic Instability
Tabletop Demonstration Atmospheric Dynamics Baroclinic Instability
2015/7/22
Here we study a fundamental instability mechanism of the atmosphere that affects us very directly in terms of mid-latitude winter weather. We provide a hands-on demonstration of this instability using...
Baroclinic instability is examined in a two-layer, quasi-geostrophic model for linearized mesoscale waves (i.e., with periods of a few months and length scales near the internal deformation radius). T...
Baroclinic Instability over a Slope. Part II：Finite-Amplitude Theory
Baroclinic Instability Finite-Amplitude Theory
2009/3/24
Baroclinic instability of a circular current is modified by the presence of a unidirectional bottom slope. An analytical theory is developed for the slightly unstable flow regime over a weak slope. Th...
Baroclinic Instability over a Slope. Part I：Linear Theory
Baroclinic Instability Slope Linear Theory
2009/3/24
We consider the instability properties of a circular current in the upper layer of a two-layer quasi-geostrophic ocean over a unidirectional slope. This particular flow-topography geometry is intended...
On Secondary Baroclinic Instability and the Meridional Scale of Motion in the Ocean
Secondary Baroclinic Instability Meridional Scale
2009/3/24
The stability of the marginally stable baroclinic wave in a uniform zonal shear flow is studied. Although the single, marginally stable wave on a horizontally uniform baroclinic current has little or ...
Baroclinic Instability in the Denmark Strait Overflow
Baroclinic Instability Denmark Strait Overflow
2009/3/7
Current meter records and hydrographic data taken in the Denmark Strait overflow during a one-month experiment in August-September 1973 are analyzed. Mean conditions indicate that a strong, cold overf...
On the Stability of a Fluid with Specialized Density Stratification. Part I：Baroclinic Instability and Constant Bottom Slope
Specialized Density Stratification Baroclinic Instability Constant Bottom Slope
2009/2/16
A three-layer model is used to study the stability of large-scale oceanic zonal flows over topography. The mean density profile employed has upper and lower layers of constant densities ρ1* and ρ3*, r...
Baroclinic Instability in a Downstream Varying Channel：Shelikof Strait, Alaska
Baroclinic Instability Shelikof Strait Downstream Varying Channel
2009/2/10
Moored current-meter observations obtained from upstream and downstream locations in Shelikof Strait, between Kodiak and Afognak Islands and the Alaskan mainland in the northwest Gulf of Alaska, show...
A linearized baroclinic instability model is applied to the Drake Passage area. The predictions of the model are found to be in good agreement with observations. Temporal and spatial scales are predic...
Modal Decomposition of the Low-Frequency Currents and Baroclinic Instability at Drake Passage
Low-Frequency Currents Baroclinic Instability Drake Passage
2009/1/16
Recently collected hydrographic data show that each of the four water mass zones previously identified in Drake Passage is characterized by a distinctly different vertical profile of Brunt-Väis&a...
The Local Baroclinic Instability of Geostrophic Spirals in the Eastern North Pacific
Local Baroclinic Instability Geostrophic Spirals Eastern North Pacific
2009/1/8
We analyze the pre-1975 hydrographic data of the Northeast Pacific and compute the large-scale two-dimensional geostrophic flow with respect to 3000 m. Using a linear three-level quasi-geostrophic mod...
A Model of Baroclinic Instability and Waves between the Ventilated Gyre and the Shadow Zone of the North Atlantic Ocean
Baroclinic Instability Ventilated Gyre Shadow Zone North Atlantic Ocean
2008/12/23
Distributions of eddy kinetic energy in the North Atlantic Ocean show that enhanced mesoscale activity exists in the Cape Verde Frontal Zone (the eastern part of the Central Water Boundary). This vari...
Eddy Amplitudes and Fluxes in a Homogeneous Model of Fully Developed Baroclinic Instability
Eddy Amplitudes Baroclinic Instability Homogeneous Model
2008/12/12
A horizontally homogeneous two-layer quasigeostrophic model with imposed environmental vertical shear is used to study eddy energies and fluxes in the regime in which an inverse barotropic energy casc...
Baroclinic Instability and Thermohaline Gradient Alignment in the Mixed Layer
mixed layer subinertial mixed layer Thermohaline Gradient Alignment Baroclinic Instability
2008/12/12
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 Rossb...
Gravitational, Symmetric, and Baroclinic Instability of the Ocean Mixed Layer
Baroclinic Instability Gravitational Symmetric Ocean Mixed Layer
2008/10/29
A hierarchy of hydrodynamical instabilities controlling the transfer of buoyancy through the oceanic mixed layer is reviewed. If a resting ocean of horizontally uniform stratification is subject to sp...