Symmetrization, vortex Rossby waves, and hurricane motion in an asymmetric balance model
| dc.contributor.author | Kallenbach, Randall J., author | |
| dc.contributor.author | Montgomery, Michael T., author | |
| dc.date.accessioned | 2022-03-23T18:13:38Z | |
| dc.date.available | 2022-03-23T18:13:38Z | |
| dc.date.issued | 1995-06 | |
| dc.description | June 1995. | |
| dc.description.abstract | The complexity of primitive equation (PE) models commonly used for forecasting hurricane track and structure changes can often make interpretation of their output difficult and speculative. A simplified balance formulation of these phenomena is desirable to further understand the physics of rapidly rotating storms. This work presents a shallow-water numerical model suitable for simulating hurricane track and evolution based on asymmetric balance (AB) theory. The model is a shallow-water formulation of AB, that incorporates rapid rotation and permits order-one divergence. The solution technique employed is a pseudo-spectral azimuthal modes model utilizing grid points radially and Fourier modes azimuthally. In this work we also consider the process of vortex axisymmetrization as a model for outward-propagating spiral bands in hurricanes. The basic physics is illustrated most sim ply for stable potential vorticity monopoles on an £-plane. Unlike the dynamics of sheared disturbances in rectilinear shear flow, symmetrizing disturbances on vortex monopoles are accompanied by outward-propagating Rossby waves whose restoring mechanism is associated with the vortex potential vorticity gradient. Expressions for phase and group velocities are derives and verified that confirm early speculations on the existence of vortex Rossby waves in hurricanes. The theory is applied to a hurricane-like vortex and the results are consistent with radar observations. The wave mechanics developed here shows promise in elucidating basic mechanisms of hurricane evolution and structure changes, such as the formation of secondary eyewalls. | |
| dc.description.sponsorship | Sponsored by the Office of Naval Research ONR-N00014-93-1-0456, and the National Science Foundation NSF ATM 9312655. | |
| dc.format.medium | reports | |
| dc.identifier.uri | https://hdl.handle.net/10217/234571 | |
| dc.language | English | |
| dc.language.iso | eng | |
| dc.publisher | Colorado State University. Libraries | |
| dc.relation | Catalog record number (MMS ID): 991000112199703361 | |
| dc.relation | QC852 .C6 no. 588 | |
| dc.relation.ispartof | Atmospheric Science Papers (Blue Books) | |
| dc.relation.ispartof | Atmospheric science paper, no. 588 | |
| dc.rights | Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. | |
| dc.subject | Hurricanes -- Tracks | |
| dc.subject | Vortex-motion | |
| dc.title | Symmetrization, vortex Rossby waves, and hurricane motion in an asymmetric balance model | |
| dc.type | Text | |
| dcterms.rights.dpla | This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). |
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