Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE
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 l...
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ftdoajarticles:oai:doaj.org/article:43974461e40349adb605d9d3f76f5c67 2023-05-15T13:53:48+02:00 Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE M. Moustaoui H. Teitelbaum A. Mahalov 2013-04-01T00:00:00Z https://doi.org/10.5194/angeo-31-675-2013 https://doaj.org/article/43974461e40349adb605d9d3f76f5c67 EN eng Copernicus Publications https://www.ann-geophys.net/31/675/2013/angeo-31-675-2013.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-31-675-2013 0992-7689 1432-0576 https://doaj.org/article/43974461e40349adb605d9d3f76f5c67 Annales Geophysicae, Vol 31, Pp 675-687 (2013) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2013 ftdoajarticles https://doi.org/10.5194/angeo-31-675-2013 2022-12-30T22:14:33Z 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. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Annales Geophysicae 31 4 675 687 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 M. Moustaoui H. Teitelbaum A. Mahalov Observation and simulation of wave breaking in the southern hemispheric stratosphere during VORCORE |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
M. Moustaoui H. Teitelbaum A. Mahalov |
author_facet |
M. Moustaoui H. Teitelbaum A. Mahalov |
author_sort |
M. Moustaoui |
title |
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 |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/angeo-31-675-2013 https://doaj.org/article/43974461e40349adb605d9d3f76f5c67 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Annales Geophysicae, Vol 31, Pp 675-687 (2013) |
op_relation |
https://www.ann-geophys.net/31/675/2013/angeo-31-675-2013.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-31-675-2013 0992-7689 1432-0576 https://doaj.org/article/43974461e40349adb605d9d3f76f5c67 |
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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1766259265125744640 |