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| Titel |
Variability of the Brewer-Dobson circulation during Stratospheric Sudden Warmings |
| VerfasserIn |
Victor Manuel Chavez-Perez, Laura de la Torre, Juan Antonio Añel, Luis Gimeno |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110227
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| Publikation (Nr.) |
 EGU/EGU2015-10205.pdf |
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| Zusammenfassung |
| In this work we look for changes in the latitudinal distribution and intensity of the vertical
branch of the Brewer-Dobson Circulation during the formation and development of the
Stratospheric Sudden Warmings. Therefore we analyze the vertical component of the
Transformed Eulerian-Mean residual circulation (w*,v*) from the lowermost stratosphere to
the mesosphere. We use daily data from the ERA-Interim reanalysis and simulations with
high vertical resolution performed with the Whole Atmosphere Community Climate Model
(WACCM).
Preliminary results show that, in the stratosphere, strong negative anomalies apppear at
high latitudes around 20 days before the wind reversal. Thereafter, they shift to lower
latitudes following the vortex, giving way to strong positive anomalies at high latitudes. In the
lowermost stratosphere and in the mesosphere corresponding anomalies are also
found.
Associated to the positive anomalies at high latitudes, a weakening of the equatorial
ascending branch of the Brewer-Dobson Circulation is found in the stratosphere. This
equatorial signal is not so clear in the model as it is in the reanalysis. |
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