Optimally coherent sets in geophysical flows: A new approach to delimiting the stratospheric polar vortex
The "edge" of the Antarctic polar vortex is known to behave as a barrier to the meridional (poleward) transport of ozone during the austral winter. This chemical isolation of the polar vortex from the middle and low latitudes produces an ozone minimum in the vortex region, intensifying the...
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ftdatacite:10.48550/arxiv.1004.3596 2023-05-15T13:39:19+02:00 Optimally coherent sets in geophysical flows: A new approach to delimiting the stratospheric polar vortex Santitissadeekorn, Naratip Froyland, Gary Monahan, Adam 2010 https://dx.doi.org/10.48550/arxiv.1004.3596 https://arxiv.org/abs/1004.3596 unknown arXiv https://dx.doi.org/10.1103/physreve.82.056311 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Geophysics physics.geo-ph Chaotic Dynamics nlin.CD FOS Physical sciences article-journal Article ScholarlyArticle Text 2010 ftdatacite https://doi.org/10.48550/arxiv.1004.3596 https://doi.org/10.1103/physreve.82.056311 2022-04-01T14:34:08Z The "edge" of the Antarctic polar vortex is known to behave as a barrier to the meridional (poleward) transport of ozone during the austral winter. This chemical isolation of the polar vortex from the middle and low latitudes produces an ozone minimum in the vortex region, intensifying the ozone hole relative to that which would be produced by photochemical processes alone. Observational determination of the vortex edge remains an active field of research. In this letter, we obtain objective estimates of the structure of the polar vortex by introducing a new technique based on transfer operators that aims to find regions with minimal external transport. Applying this new technique to European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-40 three-dimensional velocity data we produce an improved three-dimensional estimate of the vortex location in the upper stratosphere where the vortex is most pronounced. This novel computational approach has wide potential application in detecting and analysing mixing structures in a variety of atmospheric, oceanographic, and general fluid dynamical settings. Text Antarc* Antarctic DataCite Metadata Store (German National Library of Science and Technology) Antarctic Austral The Antarctic |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Geophysics physics.geo-ph Chaotic Dynamics nlin.CD FOS Physical sciences |
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Geophysics physics.geo-ph Chaotic Dynamics nlin.CD FOS Physical sciences Santitissadeekorn, Naratip Froyland, Gary Monahan, Adam Optimally coherent sets in geophysical flows: A new approach to delimiting the stratospheric polar vortex |
topic_facet |
Geophysics physics.geo-ph Chaotic Dynamics nlin.CD FOS Physical sciences |
description |
The "edge" of the Antarctic polar vortex is known to behave as a barrier to the meridional (poleward) transport of ozone during the austral winter. This chemical isolation of the polar vortex from the middle and low latitudes produces an ozone minimum in the vortex region, intensifying the ozone hole relative to that which would be produced by photochemical processes alone. Observational determination of the vortex edge remains an active field of research. In this letter, we obtain objective estimates of the structure of the polar vortex by introducing a new technique based on transfer operators that aims to find regions with minimal external transport. Applying this new technique to European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-40 three-dimensional velocity data we produce an improved three-dimensional estimate of the vortex location in the upper stratosphere where the vortex is most pronounced. This novel computational approach has wide potential application in detecting and analysing mixing structures in a variety of atmospheric, oceanographic, and general fluid dynamical settings. |
format |
Text |
author |
Santitissadeekorn, Naratip Froyland, Gary Monahan, Adam |
author_facet |
Santitissadeekorn, Naratip Froyland, Gary Monahan, Adam |
author_sort |
Santitissadeekorn, Naratip |
title |
Optimally coherent sets in geophysical flows: A new approach to delimiting the stratospheric polar vortex |
title_short |
Optimally coherent sets in geophysical flows: A new approach to delimiting the stratospheric polar vortex |
title_full |
Optimally coherent sets in geophysical flows: A new approach to delimiting the stratospheric polar vortex |
title_fullStr |
Optimally coherent sets in geophysical flows: A new approach to delimiting the stratospheric polar vortex |
title_full_unstemmed |
Optimally coherent sets in geophysical flows: A new approach to delimiting the stratospheric polar vortex |
title_sort |
optimally coherent sets in geophysical flows: a new approach to delimiting the stratospheric polar vortex |
publisher |
arXiv |
publishDate |
2010 |
url |
https://dx.doi.org/10.48550/arxiv.1004.3596 https://arxiv.org/abs/1004.3596 |
geographic |
Antarctic Austral The Antarctic |
geographic_facet |
Antarctic Austral The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://dx.doi.org/10.1103/physreve.82.056311 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1004.3596 https://doi.org/10.1103/physreve.82.056311 |
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1766117150426136576 |