TITLE

The Roles of Vortex Rossby Waves in Hurricane Secondary Eyewall Formation

AUTHOR(S)
Xin Qiu; Zhe-Min Tan; Qingnong Xiao
PUB. DATE
June 2010
SOURCE
Monthly Weather Review;Jun2010, Vol. 138 Issue 6, p2092
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A high-resolution, full-physics model initiated with an idealized tropical cyclone–like vortex is used to simulate and investigate the secondary eyewall formation. The beta skirt axisymmetrization (BSA) hypothesis previously proposed is examined and the roles of axisymmetrizing vortex Rossby waves (VRWs) in the secondary eyewall formation are further investigated. During the formation period, convection outside the inner-core region is organized into an outer spiral rainband. The PV dipoles that are persistently generated by convective updrafts through tilting effect move along the rainband and inward toward inner-core region and are finally axisymmetrized in the preexisting beta skirt region. The formation of the secondary eyewall is preceded by a rapid intensification period, during which vortical hot towers, discrete VRWs, and sheared VRWs dominate the inner-core asymmetric structures. Sheared VRWs are repeatedly emanated from the outer edge of the eyewall and become more concentric when propagating outward, leading to the formation of a weak but nonnegligible secondary circulation near the VRWs’ stagnant radius. The mean tangential flow is accelerated by the low-level convergence associated with the secondary circulation and also by the wave–mean flow interaction mechanism, both of which are elucidated by absolute angular momentum budget calculation. The mean radial gradient of relative vorticity is enhanced across the stagnant radius, causing the extension of beta skirt to outer radii in the lower-tropospheric levels. Results from this study suggest that the stagnant radius mechanism and the BSA mechanism may work cooperatively in the sense that the former helps to establish an extensive beta skirt and the latter takes charge from then on.
ACCESSION #
52216393

 

Related Articles

  • Rapidly Intensifying Hurricane Guillermo (1997). Part I: Low-Wavenumber Structure and Evolution. Reasor, Paul D.; Eastin, Matthew D.; Gamache, John F. // Monthly Weather Review;Feb2009, Vol. 137 Issue 2, p603 

    The structure and evolution of rapidly intensifying Hurricane Guillermo (1997) is examined using airborne Doppler radar observations. In this first part, the low-azimuthal-wavenumber component of the vortex is presented. Guillermo's intensification occurred in an environmental flow with...

  • Internal Control of Hurricane Intensity Variability: The Dual Nature of Potential Vorticity Mixing. Rozoff, Christopher M.; Kossin, James P.; Schubert, Wayne H.; Mulero, Pedro J. // Journal of the Atmospheric Sciences;Jan2009, Vol. 66 Issue 1, p133 

    In hurricane eyewalls, the vertical stretching effect tends to produce an annular ring of high vorticity. Idealized, unforced nondivergent barotropic model results have suggested such rings of vorticity are often barotropically unstable, leading to strong asymmetric mixing events where vorticity...

  • Wavenumber-2 and Wavenumber-m Vortex Rossby Wave Instabilities in a Generalized Three-Region Model. Terwey, Wesley D.; Montgomery, Michael T. // Journal of the Atmospheric Sciences;8/15/2002, Vol. 59 Issue 16, p2421 

    A recent study using a discrete three-region nondivergent approximation for the inner-core region of a mature hurricane-like vortex fails to catch wavenumber-2 azimuthal shear instabilities that are observed in experiments and predicted by similar continuous model representations. With hurricane...

  • Photopolymerized microscopic vortex beam generators: Precise delivery of optical orbital angular momentum. Brasselet, Etienne; Malinauskas, Mangirdas; Zˇukauskas, Albertas; Juodkazis, Saulius // Applied Physics Letters;11/22/2010, Vol. 97 Issue 21, p211108 

    Direct femtosecond laser photopolymerization is used to fabricate high resolution microscopic spiral phase plates. The total phase change all around their center is prepared to be a integer multiple of 2Ï€ for the operating wavelength in the visible domain. The optical performances of the...

  • Experimental verification of photon angular momentum and vorticity with radio techniques. Tamburini, Fabrizio; Mari, Elettra; Thidé, Bo; Barbieri, Cesare; Romanato, Filippo // Applied Physics Letters;11/14/2011, Vol. 99 Issue 20, p204102 

    The experimental evidence that radio techniques can be used for synthesizing and analyzing non-integer electromagnetic (EM) orbital angular momentum (OAM) of radiation is presented. The technique used amounts to sample, in space and time, the EM field vectors and digitally processing the data to...

  • Phase sensitive parametric amplification of optical vortex beams. Devaux, F.; Passier, R. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Apr2007, Vol. 42 Issue 1, p133 

    Optical vortex beams with different topological charges are amplified in a travelling wave phase sensitive parametric interaction. Amplified beams observed either in the near field or in the far field domains exhibit patterns that depend on the relative phase between the pump and the vortex...

  • SUPERFLUID HELIUM: Visualization of quantized vortices. Bewley, Gregory P.; Lathrop, Daniel P.; Sreenivasan, Katepalli R. // Nature;6/1/2006, Vol. 441 Issue 7093, p588 

    When liquid helium is cooled to below its phase transition at 2.172 K, vortices appear with cores that are only ångströms in diameter, about which the fluid circulates with quantized angular momentum. Here we generate small particles of solid hydrogen that can be used to image the cores of...

  • Large-scale Alfvén vortices. Onishchenko, O. G.; Pokhotelov, O. A.; Horton, W.; Scullion, E.; Fedun, V. // Physics of Plasmas;Dec2015, Vol. 22 Issue 12, p1 

    The new type of large-scale vortex structures of dispersionless Alfvén waves in collisionless plasma is investigated. It is shown that Alfvén waves can propagate in the form of Alfvén vortices of finite characteristic radius and characterised by magnetic flux ropes carrying orbital...

  • Nonlinear interaction of small-scale Rossby waves with an intense large-scale zonal flow. Manin, Dmitrii Yu.; Nazarenko, Sergey V. // Physics of Fluids;Mar1994, Vol. 6 Issue 3, p1158 

    The system of Rossby waves is unstable with respect to modulations. This instability results in the generation of a large-scale zonal flow with zero mean vorticity. It is shown that in both stable and unstable situations, a finite-time singularity formation takes place in the system. Such a...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics