Relation between Kinematic Boundaries, Stirring, and Barriers for the Antarctic Polar Vortex
Maximum stretching lines in the lower stratosphere around the Antarctic polar vortex are diagnosed using a method based on finite-size Lyapunov exponents. By analogy with the mathematical results known for simple dynamical systems, these curves are identified as stable and unstable manifolds of the...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.667.7582 2023-05-15T13:46:34+02:00 Relation between Kinematic Boundaries, Stirring, and Barriers for the Antarctic Polar Vortex Binson Joseph Bernard Legras The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.667.7582 http://www.lmd.ens.fr/legras/publis/lobo-jas.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.667.7582 http://www.lmd.ens.fr/legras/publis/lobo-jas.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.lmd.ens.fr/legras/publis/lobo-jas.pdf text ftciteseerx 2016-01-08T17:10:43Z Maximum stretching lines in the lower stratosphere around the Antarctic polar vortex are diagnosed using a method based on finite-size Lyapunov exponents. By analogy with the mathematical results known for simple dynamical systems, these curves are identified as stable and unstable manifolds of the underlying hyperbolic structure of the flow. For the first time, the exchange mechanism associated with lobe dynamics is characterized using atmospheric analyzed winds. The tangling manifolds form a stochastic layer around the vortex. It is found that fluid is not only expelled from this layer toward the surf zone but also is injected inward from the surf zone, through a process similar to the turnstile mechanism in lobe dynamics. The vortex edge, defined as the location of the maximum gradient in potential vorticity or tracer, is found to be the southward (poleward) envelope of this stochastic layer. Exchanges with the inside of the vortex are therefore largely decoupled from those, possibly intense, exchanges between the stochastic layer and the surf zone. It is stressed that using the kinematic boundary defined by the hyperbolic points and the manifolds as an operational definition of vortex boundary is not only unpractical but also leads to spurious estimates of exchanges. The authors anticipate that more accurate dynamical systems tools are needed to analyze strato-spheric transport in terms of lobe dynamics. 1. Text Antarc* Antarctic Unknown Antarctic The Antarctic |
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Unknown |
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ftciteseerx |
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English |
description |
Maximum stretching lines in the lower stratosphere around the Antarctic polar vortex are diagnosed using a method based on finite-size Lyapunov exponents. By analogy with the mathematical results known for simple dynamical systems, these curves are identified as stable and unstable manifolds of the underlying hyperbolic structure of the flow. For the first time, the exchange mechanism associated with lobe dynamics is characterized using atmospheric analyzed winds. The tangling manifolds form a stochastic layer around the vortex. It is found that fluid is not only expelled from this layer toward the surf zone but also is injected inward from the surf zone, through a process similar to the turnstile mechanism in lobe dynamics. The vortex edge, defined as the location of the maximum gradient in potential vorticity or tracer, is found to be the southward (poleward) envelope of this stochastic layer. Exchanges with the inside of the vortex are therefore largely decoupled from those, possibly intense, exchanges between the stochastic layer and the surf zone. It is stressed that using the kinematic boundary defined by the hyperbolic points and the manifolds as an operational definition of vortex boundary is not only unpractical but also leads to spurious estimates of exchanges. The authors anticipate that more accurate dynamical systems tools are needed to analyze strato-spheric transport in terms of lobe dynamics. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Binson Joseph Bernard Legras |
spellingShingle |
Binson Joseph Bernard Legras Relation between Kinematic Boundaries, Stirring, and Barriers for the Antarctic Polar Vortex |
author_facet |
Binson Joseph Bernard Legras |
author_sort |
Binson Joseph |
title |
Relation between Kinematic Boundaries, Stirring, and Barriers for the Antarctic Polar Vortex |
title_short |
Relation between Kinematic Boundaries, Stirring, and Barriers for the Antarctic Polar Vortex |
title_full |
Relation between Kinematic Boundaries, Stirring, and Barriers for the Antarctic Polar Vortex |
title_fullStr |
Relation between Kinematic Boundaries, Stirring, and Barriers for the Antarctic Polar Vortex |
title_full_unstemmed |
Relation between Kinematic Boundaries, Stirring, and Barriers for the Antarctic Polar Vortex |
title_sort |
relation between kinematic boundaries, stirring, and barriers for the antarctic polar vortex |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.667.7582 http://www.lmd.ens.fr/legras/publis/lobo-jas.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
http://www.lmd.ens.fr/legras/publis/lobo-jas.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.667.7582 http://www.lmd.ens.fr/legras/publis/lobo-jas.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766244310032842752 |