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The Effects of Flow Asymmetry on the Direction of Rossby Wave Breaking

The Effects of Flow Asymmetry on the Direction of Rossby Wave Breaking,10.1175/1520-0469(1994)051<2031:TEOFAO>2.0.CO;2,Journal of The Atmospheric Scie

The Effects of Flow Asymmetry on the Direction of Rossby Wave Breaking   (Citations: 27)
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The relationship between the direction of the breaking of Rossby waves on an isolated jet and the cross-jet asymmetry of the flow is investigated. The flow structure of a circular jet is, under most circumstances, such that waves break uniquely outward, although the authors contrive a flow on which breaking is uniquely inward. The influence on the direction of the breaking of the location of critical lines in the undisturbed flow is discussed. On a straight jet with asymmetric shear, there are three wave amplitude regimes: weak waves do not break; waves of moderate amplitude break only toward the closer critical line; and waves of sufficiently large amplitude break both ways.
Journal: Journal of The Atmospheric Sciences - J ATMOS SCI , vol. 51, no. 14, pp. 2031-2045, 1994
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    • ...decay stage, and its dynamical relevance for the large scale tropospheric circulation (e.g., Thorncroft et al., 1993; Nakamura and Plumb, 1994; Peters and Waugh, 1996; Esler and Haynes, 1999; Benedict et al., 2004; Abatzoglou and Magnusdottir, 2006; Martius et al., 2007; Woollings et al., 2008), or mass/tracer transport between the stratosphere and troposphere (e.g., Appenzeller and Davies, 1992; Waugh et al., 1994)...

    Torben Kunzet al. Synoptic scale wave breaking and its potential to drive NAO-like circu...

    • ...Thus, more synoptic Rossby waves are refracted equatorward (Nakamura and Plumb 1994) and downward with less wave breaking and dynamical heating in the Antarctic, leading to a colder and stronger polar vortex (Figs...

    Xiao-Yi Yanget al. Decadal Changes of Wind Stress over the Southern Ocean Associated with...

    • ...For the answer to this question, we turn to the fact that wave breaking occurs within regions of weak westerlies, or weak PV gradients (e.g., Nakamura and Plumb 1994)...

    Lindsey N. Williamset al. Dynamics of the Southern Hemisphere Spiral Jet

    • ...The approach taken follows Nakamura and Plumb (1994), Swanson et al. (1997) and Swanson (2000, 2001) by representing the tropopause as a single contour dividing two regions of constant quasi-geostrophic PV in a single layer shallow water ∞ow...
    • ...In Figure 2b the fundamental wave (dashed curve) and fundamental plus third harmonic (solid curve) are both plotted for kLR = 1 and †jAj = 1, to illustrate how small the predicted shape correction is. Note that the sign of the shape correction is such that all weakly nonlinear waves are ‘omega’-shaped, in the terms of Nakamura and Plumb (1994), as opposed to ‘sawtooth’-shaped...
    • ...In these cases, because no attempt is made to correct the wave shape an oscillation similar to that described by Nakamura and Plumb (1994) occurs, where the wave oscillates between having a sinusoidal and an ‘omega’-shape...
    • ...Nakamura and Plumb (1994) who looked at the short time evolution of uniform wavetrains in a near identical model in order to investigate wave breaking...

    J. G. ESLER. Benjamin-Feir Instability of Rossby Waves on a Jet

    • ...the stratospheric polar vortex (e.g., McIntyre and Palmer 1983; Juckes and McIntyre 1987; Norton 1994), on the low-latitude edge of the stratospheric surf zone (e.g., Polvani et al. 1995), and at the tropopause (e.g., Appenzeller et al. 1996; Peters and Waugh 1996), as well as in more idealized model settings (e.g., Polvani and Plumb 1992; Nakamura and Plumb 1994; Swanson et al. 1997)...
    • ...We illustrate how the relation of wave breaking intensity to the background velocity field, previously seen in idealized barotropic contour models (Polvani and Plumb 1992; Nakamura and Plumb 1994; Swanson et al. 1997), is also present in real atmospheric flows...
    • ...Such behavior includes the dependence of wave breaking intensity on the location of stagnation points (which take the place of critical layers when considering the breaking of a single wave crest; e.g., Polvani and Plumb 1992), and the dependence of wave breaking direction on the symmetry of the background flow (Nakamura and Plumb 1994; Peters and Waugh 1996)...
    • ...The investigation is motivated by the work of Polvani and Plumb (1992), Nakamura and Plumb (1994), and Swanson et al. (1997), who used barotropic contour dynamical models to study wave breaking in idealized vorticity distributions...
    • ...2 and 3. Using a similar kinematic framework Nakamura and Plumb (1994) considered the possibility for the particular structure of the background flow to allow wave breaking in the opposite direction, that is, with lowvorticity air intruding into high-vorticity surroundings...

    R. K. Scottet al. Wave Breaking and Mixing at the Subtropical Tropopause

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