Breaking synoptic-scale Rossby waves are central features of the upper-level flow in the extra-tropics and the subtropics. They are intrinsically linked to and significantly influence the weather evolution at the surface. Starting from the theoretical concepts that describe their formation and decay, the role of these breaking waves in the isentropic redistribution of momentum, potential vorticity and various chemical constitutes within upper-level extra-tropical atmosphere will be discussed. A second part discusses the role of breaking Rossby waves as upper-level potential vorticity anomalies in the tropopause region. It has been shown that such potential vorticity anomalies instigate non-local wind fields and that beneath the anomalies the static stability of the atmosphere is either reduced are enhanced depending on the sign of the anomaly. These characteristics are important for the understanding of the role of such breaking waves in triggering high impact weather events that range from heavy precipitation in the Alps, over storms in Hawaii, cold air outbreaks in Brazil, to heavy precipitation events over the African continent.

Diese Veranstaltung ist Teil der Reihe Karlsruher Meteorologisches Kolloquium

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Prof. Olivia Romppainen-Martius

Universität Bern
Oeschger-Zentrum für Klimaforschung

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Institut für Meteorologie und Klimaforschung
Karlsruher Institut für Technologie
Kaiserstraße 12
76131 Karlsruhe
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https://www.imk-tro.kit.edu/

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Wissenschaftliche Mitarbeitende