Large-scale isentropic mixing properties of the Antarctic polar vortex from analyzed winds
Winds derived from analyzed geopotential height fields are used to study quasi-horizontal mixing by the large-scale flow in the lower stratosphere during austral spring. This is the period when the Antarctic ozone hole appears and disappears. Trajectories are computed for large ensembles of particle...
Main Author: | |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1993
|
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.556.6302 http://geotest.tamu.edu/userfiles/213/93JD02599.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.556.6302 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.556.6302 2023-05-15T13:59:20+02:00 Large-scale isentropic mixing properties of the Antarctic polar vortex from analyzed winds Kenneth P. Bowman The Pennsylvania State University CiteSeerX Archives 1993 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.556.6302 http://geotest.tamu.edu/userfiles/213/93JD02599.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.556.6302 http://geotest.tamu.edu/userfiles/213/93JD02599.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://geotest.tamu.edu/userfiles/213/93JD02599.pdf text 1993 ftciteseerx 2016-01-08T11:48:27Z Winds derived from analyzed geopotential height fields are used to study quasi-horizontal mixing by the large-scale flow in the lower stratosphere during austral spring. This is the period when the Antarctic ozone hole appears and disappears. Trajectories are computed for large ensembles of particles initially inside and outside the main polar vortex. Mixing and transport are diagnosed through estimates of finite time Lyapunov exponents and Lagrangian dispersion statistics of the tracer trajectories. At 450 K and above prior to the vortex breakdown: Lyapunov exponents are a factor of 2 smaller inside the vortex than outside; diffusion coefficients are an order of magnitude smaller inside than outside the vortex; and the trajectories reveal little exchange of air across the vortex boundary. At lower levels (425 and 400 K) mixing is greater, and there is substantial exchange of air across the vortex boundary. In some years there are large wave events that expel small amounts of vortex air into the mid-latitudes. At the end of the spring season during the vortex breakdown there is rapid mixing of air across the vortex boundary, which is evident in the mixing diagnostics and the tracer trajectories. Text Antarc* Antarctic Unknown Antarctic The Antarctic Austral |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
Winds derived from analyzed geopotential height fields are used to study quasi-horizontal mixing by the large-scale flow in the lower stratosphere during austral spring. This is the period when the Antarctic ozone hole appears and disappears. Trajectories are computed for large ensembles of particles initially inside and outside the main polar vortex. Mixing and transport are diagnosed through estimates of finite time Lyapunov exponents and Lagrangian dispersion statistics of the tracer trajectories. At 450 K and above prior to the vortex breakdown: Lyapunov exponents are a factor of 2 smaller inside the vortex than outside; diffusion coefficients are an order of magnitude smaller inside than outside the vortex; and the trajectories reveal little exchange of air across the vortex boundary. At lower levels (425 and 400 K) mixing is greater, and there is substantial exchange of air across the vortex boundary. In some years there are large wave events that expel small amounts of vortex air into the mid-latitudes. At the end of the spring season during the vortex breakdown there is rapid mixing of air across the vortex boundary, which is evident in the mixing diagnostics and the tracer trajectories. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Kenneth P. Bowman |
spellingShingle |
Kenneth P. Bowman Large-scale isentropic mixing properties of the Antarctic polar vortex from analyzed winds |
author_facet |
Kenneth P. Bowman |
author_sort |
Kenneth P. Bowman |
title |
Large-scale isentropic mixing properties of the Antarctic polar vortex from analyzed winds |
title_short |
Large-scale isentropic mixing properties of the Antarctic polar vortex from analyzed winds |
title_full |
Large-scale isentropic mixing properties of the Antarctic polar vortex from analyzed winds |
title_fullStr |
Large-scale isentropic mixing properties of the Antarctic polar vortex from analyzed winds |
title_full_unstemmed |
Large-scale isentropic mixing properties of the Antarctic polar vortex from analyzed winds |
title_sort |
large-scale isentropic mixing properties of the antarctic polar vortex from analyzed winds |
publishDate |
1993 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.556.6302 http://geotest.tamu.edu/userfiles/213/93JD02599.pdf |
geographic |
Antarctic The Antarctic Austral |
geographic_facet |
Antarctic The Antarctic Austral |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
http://geotest.tamu.edu/userfiles/213/93JD02599.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.556.6302 http://geotest.tamu.edu/userfiles/213/93JD02599.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766267871735840768 |