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Colloquium
The link between dry air intrusions and frontal precipitation and winds
May. 14, 2019, 16:45 - 17:45
KIT, Campus Süd, IMK-TRO, Geb.30.23, 13.OG, Seminarraum
 

The conceptual picture of an extratropical cyclone typically includes warm and cold fronts and various cyclone-related airstreams, including the dry intrusion (DI). The DI is a stream of air descending slantwise from the upper troposphere equatorward behind the cold front. The DI may have a dynamical impact on the cold front and the cold sector behind it, helping to produce instability and potentially convective activity. However, it is not clear how the presence of DIs shapes the characteristics of the front, its environment and impact, in terms of precipitation and winds.

 

To understand and quantify the link between DIs, fronts and their environment, we combine case studies, feature-based climatologies and composite analysis, based on the ECMWF ERA-Interim dataset for winters during 1979-2014 in both hemispheres. Specifically, a global climatology of DIs, produced using a Lagrangian trajectory analysis, is joined with an objective climatology of cold fronts to quantify the climatological link between the two. In the analysis, a distinction is made between cold fronts trailing from cyclones, and cold fronts that are located away from any cyclone.

 

 
This event is part of the eventgroup Meteorology Colloquium Karlsruhe
Homepage
http://www.imk.kit.edu
Speaker
Dr. Shira Raveh-Rubin

Department of Earth and Planetary Sciences, Weizmann Institute of Science, Israel
Organizer
IMK-TRO
Institut für Meteorologie und Klimaforschung (IMK-TRO)
KIT
Wolfgang-Gaede-Str. 1
76131 Karlsruhe
Tel: 0721 608 43356
Mail:doris stenschkeBaz9∂kit edu
http://www.imk-tro.kit.edu
Targetgroup
Scientific Staff
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