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PRODID:-//T4Science Presentation Calendar//
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SUMMARY:Maintenance of Baroclinicity and Storm Tracks in the North Atlanti
 c (by Thomas Spengler)
DTSTART:20170706T100000Z
DTEND:20170706T111500Z
DTSTAMP:20170524T160231Z
UID:presentation-40.series-5
DESCRIPTION:The maintenance of baroclinicity along the mid- and high-latit
 ude storm tracks is a matter of ongoing debate. Using an isentropic framew
 ork\, a novel diagnostic based on the tendency equation for the slope of i
 sentropic surfaces – a measure of the potential for baroclinic developme
 nt – is presented. The tendency comprises contributions from dynamic pro
 cesses\, latent heat release\, radiation\, and sub-gridscale turbulence\, 
 which incorporates the effect of sensible heat fluxes. A climatology of th
 ese tendencies over the North Atlantic is compiled for the winters 2009 an
 d 2010. It is found that adiabatic tilting flattens the isentropic surface
 s\, reflecting the action of growing baroclinic cyclones. This tendency is
  climatologically balanced by the generation of slope by diabatic processe
 s. In the lower troposphere\, the most intense diabatic increase of slope 
 is found along the oceanic frontal zone associated with the Gulf Stream an
 d at higher latitudes in the Labrador Sea\, the Nordic Seas and the Barent
 s Sea. Latent heat release and sensible heat fluxes both contribute substa
 ntially in these regions. A quantitative analysis of cold air outbreaks em
 phasises their important role for restoring the slope in the lower troposp
 here over the Gulf Stream region and off the sea-ice edge at high latitude
 s. In the upper troposphere\, latent heat release due to cloud microphysic
 al processes is the dominant mechanism maintaining the slope.
LOCATION:SR Wegener Center\, Brandhofgasse 5\, 1st floor
ORGANIZER;CN="Douglas Maraun";ROLE=CHAIR:MAILTO:douglas.maraun@uni-graz.at
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