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| Titel |
The Arctic vortex in March 2011: a dynamical perspective |
| VerfasserIn |
M. M. Hurwitz, P. A. Newman, C. I. Garfinkel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 22 ; Nr. 11, no. 22 (2011-11-17), S.11447-11453 |
| Datensatznummer |
250010197
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| Publikation (Nr.) |
 copernicus.org/acp-11-11447-2011.pdf |
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| Zusammenfassung |
| Despite the record ozone loss observed in March 2011, dynamical conditions
in the Arctic stratosphere were unusual but not unprecedented. Weak
planetary wave driving in February preceded cold anomalies in the polar
lower stratosphere in March and a relatively late breakup of the Arctic
vortex in April. La Niña conditions and the westerly phase of the
quasi-biennial oscillation (QBO) were observed in March 2011. Though these
conditions are generally associated with a stronger vortex in mid-winter,
the respective cold anomalies do not persist through March. Therefore, the
La Niña and QBO-westerly conditions cannot explain the observed cold
anomalies in March 2011. In contrast, positive sea surface temperature
anomalies in the North Pacific may have contributed to the unusually weak
tropospheric wave driving and strong Arctic vortex in late winter 2011. |
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