Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE
abstract: An interesting occurrence of a Rossby wave breaking event observed during the VORCORE experiment is presented and explained. Twenty-seven balloons were launched inside the Antarctic polar vortex. Almost all of these balloons evolved in the stratosphere around 500K within the vortex, except...
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ftarizonastateun:item:46574 2023-05-15T13:49:53+02:00 Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE Moustaoui, Mohamed (ASU author) Teitelbaum, H. (Author) Mahalov, Alex (ASU author) College of Liberal Arts and Sciences School of Mathematical and Statistical Sciences 2013-04-16 13 pages https://doi.org/10.5194/angeo-31-675-2013 http://hdl.handle.net/2286/R.I.46574 eng eng ANNALES GEOPHYSICAE doi:10.5194/angeo-31-675-2013 ISSN: 0992-7689 ISSN: 1432-0576 Moustaoui, M., Teitelbaum, H., & Mahalov, A. (2013). Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE. Annales Geophysicae, 31(4), 675-687. doi:10.5194/angeo-31-675-2013 http://hdl.handle.net/2286/R.I.46574 http://rightsstatements.org/vocab/InC/1.0/ http://creativecommons.org/licenses/by/4.0 CC-BY Text 2013 ftarizonastateun https://doi.org/10.5194/angeo-31-675-2013 2018-06-30T22:52:25Z abstract: An interesting occurrence of a Rossby wave breaking event observed during the VORCORE experiment is presented and explained. Twenty-seven balloons were launched inside the Antarctic polar vortex. Almost all of these balloons evolved in the stratosphere around 500K within the vortex, except the one launched on 28 October 2005. In this case, the balloon was caught within a tongue of high potential vorticity (PV), and was ejected from the polar vortex. The evolution of this event is studied for the period between 19 and 25 November 2005. It is found that at the beginning of this period, the polar vortex experienced distortions due to the presence of Rossby waves. Then, these waves break and a tongue of high PV develops. On 25 November, the tongue became separated from the vortex and the balloon was ejected into the surf zone. Lagrangian simulations demonstrate that the air masses surrounding the balloon after its ejection were originating from the vortex edge. The wave breaking and the development of the tongue are confined within a region where a planetary Quasi-Stationary Wave 1 (QSW1) induces wind speeds with weaker values. The QSW1 causes asymmetry in the wind speed and the horizontal PV gradient along the edge of the polar vortex, resulting in a localized jet. Rossby waves with smaller scales propagating on top of this jet amplify as they enter the jet exit region and then break. The role of the QSW1 on the formation of the weak flow conditions that caused the non-linear wave breaking observed near the vortex edge is confirmed by three-dimensional numerical simulations using forcing with and without the contribution of the QSW1. This article and any associated published material is distributed under the Creative Commons Attribution 3.0 License. View the article as published at: https://www.ann-geophys.net/31/675/2013/ Text Antarc* Antarctic Arizona State University: ASU Digital Repository Antarctic The Antarctic Annales Geophysicae 31 4 675 687 |
institution |
Open Polar |
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Arizona State University: ASU Digital Repository |
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ftarizonastateun |
language |
English |
description |
abstract: An interesting occurrence of a Rossby wave breaking event observed during the VORCORE experiment is presented and explained. Twenty-seven balloons were launched inside the Antarctic polar vortex. Almost all of these balloons evolved in the stratosphere around 500K within the vortex, except the one launched on 28 October 2005. In this case, the balloon was caught within a tongue of high potential vorticity (PV), and was ejected from the polar vortex. The evolution of this event is studied for the period between 19 and 25 November 2005. It is found that at the beginning of this period, the polar vortex experienced distortions due to the presence of Rossby waves. Then, these waves break and a tongue of high PV develops. On 25 November, the tongue became separated from the vortex and the balloon was ejected into the surf zone. Lagrangian simulations demonstrate that the air masses surrounding the balloon after its ejection were originating from the vortex edge. The wave breaking and the development of the tongue are confined within a region where a planetary Quasi-Stationary Wave 1 (QSW1) induces wind speeds with weaker values. The QSW1 causes asymmetry in the wind speed and the horizontal PV gradient along the edge of the polar vortex, resulting in a localized jet. Rossby waves with smaller scales propagating on top of this jet amplify as they enter the jet exit region and then break. The role of the QSW1 on the formation of the weak flow conditions that caused the non-linear wave breaking observed near the vortex edge is confirmed by three-dimensional numerical simulations using forcing with and without the contribution of the QSW1. This article and any associated published material is distributed under the Creative Commons Attribution 3.0 License. View the article as published at: https://www.ann-geophys.net/31/675/2013/ |
author2 |
Moustaoui, Mohamed (ASU author) Teitelbaum, H. (Author) Mahalov, Alex (ASU author) College of Liberal Arts and Sciences School of Mathematical and Statistical Sciences |
format |
Text |
title |
Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE |
spellingShingle |
Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE |
title_short |
Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE |
title_full |
Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE |
title_fullStr |
Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE |
title_full_unstemmed |
Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE |
title_sort |
observation and simulation of wave breaking in the southern hemispheric stratosphere during vorcore |
publishDate |
2013 |
url |
https://doi.org/10.5194/angeo-31-675-2013 http://hdl.handle.net/2286/R.I.46574 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
ANNALES GEOPHYSICAE doi:10.5194/angeo-31-675-2013 ISSN: 0992-7689 ISSN: 1432-0576 Moustaoui, M., Teitelbaum, H., & Mahalov, A. (2013). Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE. Annales Geophysicae, 31(4), 675-687. doi:10.5194/angeo-31-675-2013 http://hdl.handle.net/2286/R.I.46574 |
op_rights |
http://rightsstatements.org/vocab/InC/1.0/ http://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/angeo-31-675-2013 |
container_title |
Annales Geophysicae |
container_volume |
31 |
container_issue |
4 |
container_start_page |
675 |
op_container_end_page |
687 |
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1766252481531084800 |