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SUMMARY:Potential Vorticity: A Diagnostic Tool for General Circulation Mod
 els - Jared Whitehead\,   (Los Alamos National Laboratory)
DTSTART:20120927T082500Z
DTEND:20120927T085000Z
UID:TALK40216@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Maintaining correlation between tracers and the dynamical wind
  and temperature fields with which they interact is a desirable trait of c
 limate and weather models. A systematic\, explicit test is developed to me
 asure the consistency between a dynamical core's integration of the moment
 um equation\, and its tracer transport algorithm. Potential vorticity is u
 sed as a diagnostic tool allowing direct comparison between the treatment 
 of the dynamics and the integration of passive tracers. Several quantitati
 ve and qualitative metrics are suggested to measure this consistency inclu
 ding grid-independent probability density functions. Comparisons between t
 he four primary dynamical cores of the National Center for Atmospheric Res
 earch's (NCAR) Community Earth System Model 1.0 (CESM) are presented. It i
 s found that the finite volume (CAM-FV) and spectral-element (CAM-SE) dyna
 mical cores perform better than the spectral-transform based Eulerian (CAM
 -EUL) and semi-Lagrangian (CA M-SLD) dynamical cores in the presence of a 
 breaking wave.\n\n
LOCATION:Seminar Room 1\, Newton Institute
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