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| Titel |
Relation between the 100Â hPa heat flux and stratospheric potential vorticity |
| VerfasserIn |
Maarten Ambaum, Yvonne Hinssen |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055740
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| Zusammenfassung |
| The exchange of momentum between the stratosphere and the troposphere can be described
with Eliassen–Palm flux vectors. Most compactly, the Eliassen–Palm vectors can be
interpreted as eddy potential vorticity fluxes. This interpretation allows us to write down a
simple analytical model for the change of stratospheric potential vorticity as a result from
vertical Eliassen–Palm fluxes at the tropopause. In this model, the Eliassen–Palm fluxes at the
tropopause “force” the stratosphere with a time-lag dependent on the wave propagation
characteristics in the stratosphere.
It is shown that the analytical model can predict the variability of the potential
vorticity in the stratosphere to a remarkable degree. Especially when major warmings
occur, the model is able to predict about 80% of the variance in these warmings. On
average, the model can predict abouyt 50% of the stratospheric potential vorticity
variance.
The implications of the success of this model are discussed. |
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