Lobe dynamics applied to barotropic Rossby-wave breaking
We applied the methods of lobe dynamics to the problem of transport across the edge of a barotropic vortex patch. The model used captures the essential dynamics of filament shedding in the wintertime stratospheric polar vortex. Two approaches were adopted for the problem: (1) the dominant periodic c...
| Main Authors: | , |
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| Format: | Journal Article |
| Language: | English |
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2012
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| Online Access: | https://hdl.handle.net/10356/94017 http://hdl.handle.net/10220/8223 |
| _version_ | 1811685952179929088 |
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| author | Koh, Tieh Yong. Plumb, R. Alan. |
| author_facet | Koh, Tieh Yong. Plumb, R. Alan. |
| author_sort | Koh, Tieh Yong. |
| collection | NTU |
| description | We applied the methods of lobe dynamics to the problem of transport across the edge of a barotropic vortex patch. The model used captures the essential dynamics of filament shedding in the wintertime stratospheric polar vortex. Two approaches were adopted for the problem: (1) the dominant periodic component of the vortical flow was identified and conventional lobe dynamics methods for periodic dynamical systems were applied to it; (2) the full aperiodic, dynamically consistent flow was retained and a modified brand of lobe dynamics was used to quantify the transport. Our results show that in the periodic case, much reversible transport occurs across the lobe dynamical boundary due to overlapping intruding and extruding lobes. In the aperiodic case, a small amount of intrusion was noted, contrary to the well-established fact that potential vorticity shedding in barotropic vortices is uniquely outwards. In our discussion, we argue that while lobe dynamics provides a rigorous framework for quantifying transport across the lobe dynamical boundary, this boundary may not be appropriate for quantifying transport across internal transport barriers, such as the stratospheric polar vortex edge. |
| first_indexed | 2024-10-01T04:52:41Z |
| format | Journal Article |
| id | ntu-10356/94017 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:52:41Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/940172020-09-26T21:29:44Z Lobe dynamics applied to barotropic Rossby-wave breaking Koh, Tieh Yong. Plumb, R. Alan. DRNTU::Science::Geology We applied the methods of lobe dynamics to the problem of transport across the edge of a barotropic vortex patch. The model used captures the essential dynamics of filament shedding in the wintertime stratospheric polar vortex. Two approaches were adopted for the problem: (1) the dominant periodic component of the vortical flow was identified and conventional lobe dynamics methods for periodic dynamical systems were applied to it; (2) the full aperiodic, dynamically consistent flow was retained and a modified brand of lobe dynamics was used to quantify the transport. Our results show that in the periodic case, much reversible transport occurs across the lobe dynamical boundary due to overlapping intruding and extruding lobes. In the aperiodic case, a small amount of intrusion was noted, contrary to the well-established fact that potential vorticity shedding in barotropic vortices is uniquely outwards. In our discussion, we argue that while lobe dynamics provides a rigorous framework for quantifying transport across the lobe dynamical boundary, this boundary may not be appropriate for quantifying transport across internal transport barriers, such as the stratospheric polar vortex edge. Published version 2012-06-20T08:40:53Z 2019-12-06T18:49:19Z 2012-06-20T08:40:53Z 2019-12-06T18:49:19Z 2000 2000 Journal Article Koh, T. Y. & Plumb, R. A. (2000). Lobe dynamics applied to barotropic Rossby-wave breaking. Physics of Fluids, 12(6), 1518-1528. 1070-6631 https://hdl.handle.net/10356/94017 http://hdl.handle.net/10220/8223 10.1063/1.870400 en Physics of fluids © 2000 American Institute of Physics.This paper was published in Physics of Fluids and is made available as an electronic reprint (preprint) with permission of American Institute of Physics. The paper can be found at the following official URL: [http://dx.doi.org/10.1063/1.870400]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law. 12 p. application/pdf |
| spellingShingle | DRNTU::Science::Geology Koh, Tieh Yong. Plumb, R. Alan. Lobe dynamics applied to barotropic Rossby-wave breaking |
| title | Lobe dynamics applied to barotropic Rossby-wave breaking |
| title_full | Lobe dynamics applied to barotropic Rossby-wave breaking |
| title_fullStr | Lobe dynamics applied to barotropic Rossby-wave breaking |
| title_full_unstemmed | Lobe dynamics applied to barotropic Rossby-wave breaking |
| title_short | Lobe dynamics applied to barotropic Rossby-wave breaking |
| title_sort | lobe dynamics applied to barotropic rossby wave breaking |
| topic | DRNTU::Science::Geology |
| url | https://hdl.handle.net/10356/94017 http://hdl.handle.net/10220/8223 |
| work_keys_str_mv | AT kohtiehyong lobedynamicsappliedtobarotropicrossbywavebreaking AT plumbralan lobedynamicsappliedtobarotropicrossbywavebreaking |