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| Titel |
Quasi-stationary waves and their connection to oceanic and atmospheric anomalies |
| VerfasserIn |
Gabriel Wolf, David Brayshaw, Nicholas Klingaman, Arnaud Czaja |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149853
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| Publikation (Nr.) |
 EGU/EGU2017-14247.pdf |
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| Zusammenfassung |
| Strong quasi-stationary atmospheric waves are known to be associated with persistent extreme weather events. We are especially interested in possible oceanic drivers for such quasi-stationary waves over the European-Atlantic region. The existence of such oceanic drivers would suggest potential predictability, or at least a better risk assessment of such events, on a timescale of several weeks or more. We define quasi-stationary waves by the longitudinal envelope of the lowpass filtered meridional wind. For a deeper understanding of these waves and the associated large-scale weather, we created and analysed a climatology of these waves. Besides a clear connection between quasi-stationary waves and persistent extreme temperature and precipitation events, these waves are strongly associated with well-known global pattern indices, especially the Arctic Oscillation/North Atlantic Oscillation and the El Nino-Southern Oscillation. An extensive analysis of the connection between these waves and oceanic anomalies further revealed a connection between Pacific surface heat fluxes and large scale quasi-stationary waves over the Atlantic and Europe. We investigate these connections to better understand the evolution of such quasi-stationary waves and the importance of oceanic anomalies as possible drivers. |
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