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RISGravity Waves in a Horizontal Shear Flow. Part I: Growth Mechanisms in the Absence of Potential Vorticity Perturbations
Publisher: American Meteorological Society
Abstract: Interaction of internal gravity waves with a horizontal shear flow in the absence of potential vorticity perturbations is investigated making use of closed-form solutions. Localized wave packet trajectories are obtained, ...
Momentum and Energy Transport by Gravity Waves in Stochastically Driven Stratified Flows. Part I: Radiation of Gravity Waves from a Shear Layer
Publisher: American Meteorological Society
Abstract: In this paper, the emission of internal gravity waves from a local westerly shear layer is studied. Thermal and/or vorticity forcing of the shear layer with a wide range of frequencies and scales can lead to strong emission ...
Gravity Waves in a Horizontal Shear Flow. Part II: Interaction between Gravity Waves and Potential Vorticity Perturbations
Publisher: American Meteorological Society
Abstract: Interaction among potential vorticity perturbations and propagating internal gravity waves in a horizontally sheared zonal flow is investigated. In the strong stratification limit, an initial vorticity perturbation weakly ...
On the Mechanism Underlying the Spontaneous Emergence of Barotropic Zonal Jets
Publisher: American Meteorological Society
Abstract: onal jets are commonly observed to spontaneously emerge in a ?-plane channel from a background of turbulence that is sustained in a statistical steady state by homogeneous stochastic excitation and dissipation of vorticity. ...
Momentum and Energy Transport by Gravity Waves in Stochastically Driven Stratified Flows. Part II: Radiation of Gravity Waves from a Gaussian Jet
Publisher: American Meteorological Society
Abstract: Interaction between the midlatitude jet and gravity waves is examined, focusing on the nonnormality of the underlying linear dynamics, which plays an essential role in processing the wave activity and selecting structures ...
The Role of Nonnormality in Overreflection Theory
Publisher: American Meteorological Society
Abstract: The role of nonnormality in the overreflection of gravity waves is investigated. In the limit of weak stratification, wave packets having a critical level inside a shear layer of finite depth are reflected with amplified ...
The Emergence of Coherent Structures in Stratified Shear Flow
Publisher: American Meteorological Society
Abstract: Three-dimensional perturbations producing optimal energy growth in stratified, unbounded constant shear flow are determined. The optimal perturbations are intrinsically three-dimensional in structure. Streamwise rolls ...
S3T Stability of the Homogeneous State of Barotropic Beta-Plane Turbulence
Publisher: American Meteorological Society
Abstract: onal jets and nonzonal large-scale flows are often present in forced?dissipative barotropic turbulence on a beta plane. The dynamics underlying the formation of both zonal and nonzonal coherent structures is investigated ...
Statistical State Dynamics of Weak Jets in Barotropic Beta-Plane Turbulence
Publisher: American Meteorological Society
Abstract: AbstractZonal jets in a barotropic setup emerge out of homogeneous turbulence through a flow-forming instability of the homogeneous turbulent state (zonostrophic instability), which occurs as the turbulence intensity ...