The development of extratropical cyclones can be seen as an interplay of three positive potential vorticity (PV) anomalies: an upper-level stratospheric intrusion, low-tropospheric diabatically produced PV, and a warm anomaly at the surface acting as a surrogate PV anomaly. In the mature stage they become vertically aligned and form a “PV tower” associated with strong cyclonic circulation. We used a climatological dataset and numerical model experiments to investigate the amplitude of the three anomalies and the processes leading in particular to the formation of the diabatically produced low-tropospheric PV anomaly. A climatological study of the amplitude of the three PV anomalies in mature extratropical cyclones in different regions in the Northern Hemisphere reveals a prominent regional and seasonal variability of the cyclones’ vertical structure and the profile evolution. By means of Lagrangian trajectories we have identified source regions of moisture, which is relevant for the diabatic production of low-level PV in the cyclone centre. A numerical model case study complements this work by analyzing the impact of regionally confined moisture sources on the evolution of the cyclone.

Diese Veranstaltung ist Teil der Reihe Karlsruher Meteorologisches Kolloquium

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https://www.imk.kit.edu/96.php

Referent/in
Dr. Jana Campa

KIT Karlsruhe
Institut für Meteorologie und 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