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UID:20250514T110046EDT-1650prHUTv@132.216.98.100
DTSTAMP:20250514T150046Z
DESCRIPTION:Identifying tropospheric sources of synoptic time-scale increas
 es in Zonal Available Potential Energy (APE)\n\n\n\nAbstract\n\nAvailable 
 Potential Energy (APE)\, which approximates the overall strength of the ge
 neral circulation in the troposphere\, has been shown to be modulated on t
 ime scales ranging from synoptic time scales (3-10 days) up to annual time
  scales.  Though previous studies have established a strong framework for 
 the physical mechanisms modulating APE on annual time scales and depleting
  APE on sub-seasonal to synoptic time scale\, little has been done to exam
 ine the ability for APE to increase on synoptic time scales.  Applying an 
 objective\, standardized anomaly-based identification scheme to identify s
 ynoptic time scale increases in daily (1979-2011) zonal APE (ZAPE)\, we fi
 nd 160 buildup events which are sub-divided both by season and into two ca
 tegories based on how anomalous the final ZAPE anomaly is.  Using these ca
 tegories\, we attempt to examine sources of increase in ZAPE based using s
 everal zonal mean approaches: energetic conversion terms\, energetic gener
 ation terms\, thermodynamic budget terms\, and perturbations to the U\, V\
 , and omega decomposition of the wind.  Our results suggest that rapid bui
 ldups in ZAPE are not so much a function of ZAPE generation as they are a 
 function of a large-scale reduction in baroclinic conversions from ZAPE to
  eddy APE (EAPE).  Furthermore\, there are statistically significant chang
 es to the zonal mean tropospheric circulation\, which will be commented on
  in the context of impacts on thermally direct circulations.\n
DTSTART:20150923T183000Z
DTEND:20150923T193000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Student Seminar: Kevin Bowley
URL:/meteo/channels/event/student-seminar-kevin-bowley
 -255052
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