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Relevant bibliographies by topics / Ageostrophic flow

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Academic literature on the topic 'Ageostrophic flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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Journal articles on the topic "Ageostrophic flow"

1

Brüggemann, Nils, and Carsten Eden. "Routes to Dissipation under Different Dynamical Conditions." Journal of Physical Oceanography 45, no. 8 (2015): 2149–68. http://dx.doi.org/10.1175/jpo-d-14-0205.1.

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AbstractIn this study, it is investigated how ageostrophic dynamics generate an energy flux toward smaller scales. Numerical simulations of baroclinic instability are used with varying dynamical conditions ranging from quasigeostrophic balance to ageostrophic flows. It turns out that dissipation at smaller scales by viscous friction is much more efficient if the flow is dominated by ageostrophic dynamics than in quasigeostrophic conditions. In the presence of ageostrophic dynamics, an energy flux toward smaller scales is observed while energy is transferred toward larger scales for quasigeostr

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Pallàs-Sanz, Enric, and Álvaro Viúdez. "Three-Dimensional Ageostrophic Motion in Mesoscale Vortex Dipoles." Journal of Physical Oceanography 37, no. 1 (2007): 84–105. http://dx.doi.org/10.1175/jpo2978.1.

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Abstract The three-dimensional motion of mesoscale baroclinic dipoles is simulated using a nonhydrostatic Boussinesq numerical model. The initial conditions are two ellipsoidal vortices of positive and negative potential vorticity anomalies. The flow is moderately ageostrophic with a maximum absolute Rossby number equal to 0.71. The trajectory of the dipole is related to the maximum potential vorticity anomaly and size of the vortices. Three cases are considered depending on the curvature of the dipole trajectory: negative, close to zero, and positive. The ageostrophic flow strongly depends on

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Ménesguen, Claire, J. C. McWilliams, and M. J. Molemaker. "Ageostrophic instability in a rotating stratified interior jet." Journal of Fluid Mechanics 711 (September 28, 2012): 599–619. http://dx.doi.org/10.1017/jfm.2012.412.

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AbstractOceanic large- and meso-scale flows are nearly balanced in forces between Earth’s rotation and density stratification effects (i.e. geostrophic, hydrostatic balance associated with small Rossby and Froude numbers). In this regime advective cross-scale interactions mostly drive energy toward larger scales (i.e. inverse cascade). However, viscous energy dissipation occurs at small scales. So how does the energy reservoir at larger scales leak toward small-scale dissipation to arrive at climate equilibrium? Here we solve the linear instability problem of a balanced flow in a rotating and

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VIÚDEZ, ÁLVARO. "The origin of the stationary frontal wave packet spontaneously generated in rotating stratified vortex dipoles." Journal of Fluid Mechanics 593 (November 23, 2007): 359–83. http://dx.doi.org/10.1017/s0022112007008816.

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The origin of the stationary frontal wave packet spontaneously generated in rotating and stably stratified vortex dipoles is investigated through high-resolution three-dimensional numerical simulations of non-hydrostatic volume-preserving flow under the f-plane and Boussinesq approximations. The wave packet is rendered better at mid-depths using ageostrophic quantities like the vertical velocity or the vertical shear of the ageostrophic vertical vorticity. The analysis of the origin of vertical velocity anomalies in shallow layers using the generalized omega-equation reveals that these anomali

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Wang, Peng, James C. McWilliams, and Ziv Kizner. "Ageostrophic instability in rotating shallow water." Journal of Fluid Mechanics 712 (September 28, 2012): 327–53. http://dx.doi.org/10.1017/jfm.2012.422.

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AbstractLinear instabilities, both momentum-balanced and unbalanced, in several different $ \overline{u} (y)$ shear profiles are investigated in the rotating shallow water equations. The unbalanced instabilities are strongly ageostrophic and involve inertia–gravity wave motions, occurring only for finite Rossby ($\mathit{Ro}$) and Froude ($\mathit{Fr}$) numbers. They serve as a possible route for the breakdown of balance in a rotating shallow water system, which leads the energy to cascade towards small scales. Unlike previous work, this paper focuses on general shear flows with non-uniform po

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Egger, Joseph, and Thomas Spengler. "Nonuniqueness of Attribution in Piecewise Potential Vorticity Inversion." Journal of the Atmospheric Sciences 75, no. 3 (2018): 875–83. http://dx.doi.org/10.1175/jas-d-17-0039.1.

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Abstract Piecewise potential vorticity inversion (PPVI) seeks to determine the impact of observed potential vorticity (PV) anomalies on the surrounding flow. This widely used technique is based on dividing a flow domain D into subdomains D1 and D2 = D − D1. The influence of PV in D1 on the flow in D2 is assessed by removing all PV anomalies in D2 and then inverting the modified PV in D. The resulting flow with streamfunction ψ1 is attributed to the PV anomalies in D1. The relation of PV in D1 to ψ1 in D2 is not unique, because there are many PV distributions in D1 that induce the same ψ1. Ther

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Thomas, Leif N. "On the effects of frontogenetic strain on symmetric instability and inertia–gravity waves." Journal of Fluid Mechanics 711 (September 20, 2012): 620–40. http://dx.doi.org/10.1017/jfm.2012.416.

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AbstractThe dynamics of symmetric instability and two-dimensional inertia–gravity waves in a baroclinic geostrophic flow undergoing frontogenesis is analysed. A frontogenetic strain associated with a balanced deformation field drives an ageostrophic circulation and temporal variations in the basic state that significantly affect the properties of perturbations to the background flow. For stable stratification, perturbations to the basic state result in symmetric instability or inertia–gravity waves, depending on the sign of the Ertel potential vorticity and the magnitude of the Richardson numb

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Kafiabad, Hossein A., and Peter Bartello. "Balance dynamics in rotating stratified turbulence." Journal of Fluid Mechanics 795 (April 22, 2016): 914–49. http://dx.doi.org/10.1017/jfm.2016.164.

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If classical quasigeostrophic (QG) flow breaks down at smaller scales, it gives rise to questions of whether higher-order nonlinear balance can be maintained, to what scale and for how long. These are naturally followed by asking how this is affected by stratification and rotation. To address these questions, we perform non-hydrostatic Boussinesq simulations where the initial data is balanced using the Baer–Tribbia nonlinear normal mode initialization scheme (NNMI), which is accurate to second order in the Rossby number, as the next-order improvement to first-order QG theory. The NNMI procedur

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Cai, Ming, and Bohua Huang. "A Dissection of Energetics of the Geostrophic Flow: Reconciliation of Rossby Wave Energy Flux and Group Velocity." Journal of the Atmospheric Sciences 70, no. 7 (2013): 2179–96. http://dx.doi.org/10.1175/jas-d-12-0249.1.

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Abstract It is shown in this paper that there is no ambiguity in the final form of the governing equations of a quasigeostrophic (QG) model after partitioning the total flow into the geostrophic, balanced ageostrophic, and unbalanced ageostrophic components. The uniqueness of the QG model formulation ensures that the energetics of a QG model is the same as that derived from the QG potential vorticity equation. Particularly, the well-known but somewhat mysterious “missing term” in the energetics of Rossby waves, identified in the literature as the difference between the pressure work and the en

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McWilliams, James C., and M. Jeroen Molemaker. "Baroclinic Frontal Arrest: A Sequel to Unstable Frontogenesis." Journal of Physical Oceanography 41, no. 3 (2011): 601–19. http://dx.doi.org/10.1175/2010jpo4493.1.

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Abstract In a large-scale deformation flow, lateral and vertical buoyancy gradients sharpen through baroclinic frontogenesis near the surface boundary. A “thermally direct” ageostrophic secondary circulation cell arises during frontogenesis to maintain geostrophic, hydrostatic (thermal wind) momentum balance for the alongfront flow. Unstable three-dimensional fluctuations can grow during frontogenesis by baroclinic instability of the alongfront shear flow that converts frontal potential energy to fluctuation energy. At finite amplitude, the fluctuations provide alongfront-averaged eddy momentu

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Dissertations / Theses on the topic "Ageostrophic flow"

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Garabato, Alberto Carlos Naveira. "On the physical controls of the biological uptake of COâ†2 in the Antarctic circumpolar current." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367259.

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Tladi, Maleafisha Stephen. "Well-posedness and long-time dynamics of β-plane ageostrophic flows". Doctoral thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/5966.

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Books on the topic "Ageostrophic flow"

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Zeitlin, Vladimir. Instabilities of Jets and Fronts and their Nonlinear Evolution. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198804338.003.0010.

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Notions of linear and nonlinear hydrodynamic (in)stability are explained and criteria of instability of plane-parallel flows are presented. Instabilities of jets are investigated by direct pseudospectral collocation method in various flow configurations, starting from the classical barotropic and baroclinic instabilities. Characteristic features of instabilities are displayed, as well as typical patterns of their nonlinear saturation. It is shown that in the Phillips model of Chapter 5, new ageostrophic Rossby–Kelvin and shear instabilities appear at finite Rossby numbers. These instabilities

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Zeitlin, Vladimir. Instabilities in Cylindrical Geometry: Vortices and Laboratory Flows. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198804338.003.0011.

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Vortex solutions in cyclo-geostrophic equilibrium are described and their geostrophic and ageostrophic barotropic and baroclinic instabilities are studied along the lines of Chapter 10. Special attention is paid to centrifugal instability which, as the inertial instability of jets, is due to modes trapped in the anticyclonic shear in the vortex, and has asymmetric counterparts. Saturation of this instability is shown to exhibit some specific patterns. Instabilities of intense hurricane-like vortices are analysed and shown to be sensitive to fine details of the vortex profile. Nonlinear saturat

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Book chapters on the topic "Ageostrophic flow"

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Pateras, S. C., and N. A. Bakas. "Transient Growth of Ageostrophic Perturbations in a Baroclinic Shear Flow." In Perspectives on Atmospheric Sciences. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-35095-0_53.

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Zeytounian, Radyadour. "The Quasi-geostrophic and Ageostrophic Models." In Asymptotic Modeling of Atmospheric Flows. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-73800-5_11.

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Salmon, Rick. "Introduction to Geophysical Fluid Dynamics." In Lectures on Geophysical Fluid Dynamics. Oxford University Press, 1998. http://dx.doi.org/10.1093/oso/9780195108088.003.0005.

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This second chapter offers a brief introduction to geophysical fluid dynamics—the dynamics of rotating, stratified flows. We start with the shallow water equations, which govern columnar motion in a thin layer of homogeneous fluid. Roughly speaking, the solutions of the shallow-water equations comprise two types of motion: ageostrophic motions, including inertia-gravity waves, on the one hand, and nearly geostrophic motions on the other. In rapidly rotating flow, these two types of motion may, in some sense, decouple. We seek simpler equations that describe only the nearly geostrophic motion. The simplest such equations are the quasigeostrophic equations. In the quasigcostrophic equations, potential vorticity plays the key role: The potential vorticity completely determines the velocity field that transports it, thereby controlling the whole dynamics. We begin by generalizing our previously derived fluid equations to a rotating coordinate frame.

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Wood, Richard A. "Eddy Generation by Instability of a Highly Ageostrophic Front: Mean Flow Interactions and Potential Vorticity Dynamics." In Mesoscale/Synoptic Coherent structures in Geophysical Turbulence. Elsevier, 1989. http://dx.doi.org/10.1016/s0422-9894(08)70190-9.

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