 |
| Titel |
Air mass exchange across the polar vortex edge during a simulated major stratospheric warming |
| VerfasserIn |
G. Günther, M. Dameris |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 13, no. 7 ; Nr. 13, no. 7, S.745-756 |
| Datensatznummer |
250011918
|
| Publikation (Nr.) |
 copernicus.org/angeo-13-745-1995.pdf |
|
|
|
|
|
| Zusammenfassung |
| The dynamics of the polar vortex in winter
and spring play an important role in explaining observed low ozone values. A
quantification of physical and chemical processes is necessary to obtain
information about natural and anthropogenic causes of fluctuations of ozone.
This paper aims to contribute to answering the question of how permeable the
polar vortex is. The transport into and out of the vortex ("degree of
isolation") remains the subject of considerable debate. Based on the
results of a three-dimensional mechanistic model of the middle atmosphere, the
possibility of exchange of air masses across the polar vortex edge is
investigated. Additionally the horizontal and vertical structure of the polar
vortex is examined. The model simulation used for this study is related to the
major stratospheric warming observed in February 1989. The model results show
fair agreement with observed features of the major warming of 1989. Complex
structures of the simulated polar vortex are illustrated by horizontal and
vertical cross sections of potential vorticity and inert tracer. A
three-dimensional view of the polar vortex enables a description of the vortex
as a whole. During the simulation two vortices and an anticyclone, grouped
together in a very stable tripolar structure, and a weaker, more amorphous
anticyclone are formed. This leads to the generation of small-scale features.
The results also indicate that the permeability of the vortex edges is low
because the interior of the vortices remain isolated during the simulation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|