Diapositiva 1

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Mesoscale Simulations at UIB using MesoNH and
their verification
M.A. Jiménez and J.Cuxart Universitat de les
Illes Balears
5th Meso-NH users meeting, Toulouse 12-13
October 2009
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• Objective to study the local nocturnal
  circulations at the basin scale under stably
  stratified conditions and weak pressure gradient
  conditions (under very weak winds)
• Works at UIB ? Data analysis
• ? LES modelling (later)
• ? Mesoscale modelling
• Meso-NH (MASDEV4_6, now 4_7-8) at ECMWF
• Lateral conditions analysis from ECMWF
• Verification against observations AWS and
  satellite images (NOAA and MSG)

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• Studied domains
• MALLORCA ISLAND
• 125x100 grid points
• at 1km resolution
• (2 domains, nesting)
• DUERO RIVER BASIN
• 320x250 grid points
• at 2km resolution
• (1 domain)
• EBRE RIVER BASIN
• 360x240 grid points
• at 2km resolution
• (1 domain)

• Vertical resolution about 3 m close to the
  ground and stretched above (85 levels)
• Turbulence radiation soil condensation
  schemes

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The Mallorca island
125 km
? 1 km
? 5 km
100 km
Cases of study 5 -6 January 1999 and 28-29
April 2005 (MSG) Cuxart et al. (MWR, 2007)
Jiménez et al. (MWR, 2008)
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VERIFICATION USING AWS (I)
fields at 0000 UTC
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VERIFICATION USING AWS (II)
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VERIFICATION USING NOAA IMAGES
NOAA 2130 UTC
MODEL 2130 UTC
MODEL 0330 UTC
NOAA 0330 UTC
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small and closed valley
10km inland
middle of a basin
at the seashore
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vegetation
Spatial resolution
Satellite
MesoNH
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Heterogeneous cooling in the Duero river basin
640 km
500 km
100 m TOWER densely instrumented
case of study from 12 to 15 January
2003 Martinez et al. (2009)
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INTENSITY OF THE WIND
SPATIALLY AVERAGED PROFILES AT 0000UTC FOR EACH
CATEGORY
0.5 lt wind lt 2 m/s 2 lt wind lt 4 m/s wind gt 4
m/s no jet
SURFACE STABILITY
0 lt ?? lt 2 K 2 lt ??lt 4 K ?? gt 4 K
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Further work continue with the study of
the katabatic and basin scale flows their
verification

• Use new version MASDEV4_7/8 in c1a (ECMWF
  machine)
• Revise the surface parameters (soil uses, covers,
  ground water
• contents, ...) for the domains of interest in
  order to better represent
• the observed surface coolings
• Increase the complexity of the runs (fog
  formation in the
• Ebre basin)
• Study new domains as the Ebre river (surface
  energy balance
• station and sodar-RASS profiler close to Lleida)
• Verification against aircraft observations