Three real case simulations by MesoNH validated against satellite observations

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Three real case simulations by Meso-NH validated
against satellite observations

• J.-P. Chaboureau and J.-P. Pinty
• Laboratoire dAérologie, Toulouse

• Elbe flood
• BBC shallow clouds
• IMPROVE heavy orographic precipitation

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Meso-NH simulation setup

• 3 nested models
• 40 km (150x108), 10 km and 2.5 km (160x160)
• 50 levels from 60 m (bot) up to 600 m (top)
• Physics
• 1D turb / ECMWF radiation / ISBA surface
• Mixed-phase bulk microphysics Pinty-Jabouille (5
  species cloud water, rain, ice, snow, graupel)
• KFBechtolds convection scheme (40 and 10 km)
• Initialization/coupling with ECMWF analysis
• ( use of NCEP forecast for IMPROVE case)

Standard Meso-NH simulations on NEC (SX5) _at_IDRIS
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Model-to-Satellite Approach
Meso-NH meteo model
VIS- IR-MW
convection
µphysics
sub-grid
full grid
rain snow graupel
water ice
water vapour
Observation Operator radiative transfer code
Satellite Observation
Synthetic Observation
Quantitative Comparison with scale similarity
Real case study
Forecast quality
Tuning pertinence
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The Elbe Flood Case

• A 24-h run starting at 00 UTC 12 Aug. 2002

40 km
10 km
2.5 km
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Comparison with Meteosat IR

• 12 UTC 12 Aug

03 UTC 12 Aug
00 UTC 13 Aug
Observation
Meso-NH
10 km grid
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Comparison with Radar
(Rudolf and Rapp 2002)
12 UTC 12 August
Meso-NH reflectivities at 3 km
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Precipitation
3-day rain-gauge
Meso-NH 24 h Acc. Precip
Meso-NH at 2.5 km
06 UTC 10 to 06 UTC 13 Aug
(Rudolf and Rapp 2002)
Meso-NH at 10 km
00 UTC 12 to 00 UTC 13 Aug
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The BALTEX BRIDGE Campaign Cases

• Two 24-h runs starting at 00 UTC on 23 Sept 2001
  and 21 May 2003

40 km
10 km
2.5 km
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Shallow clouds (23 Sept 2001)

• Meteosat IR

Meteosat Vis
Observation at Cabauw
12 UTC
12 UTC
0
24 h
Meso-NH at Cabauw
Meso-NH IR
Meso-NH LWP
12 UTC
12 UTC
24 h
0
2.5 km grid
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Two cloud layers (21 May 2003)
At Cabauw
Observation
No retrieval rain!
12 UTC
12 UTC
Meso-NH LWP
Meso-NH
12 UTC
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Two cloud layers (21 May 2003)

• Meteosat IR

Meteosat Vis
Meteosat IR
Observation
Meso-NH IR
Meso-NH LWP
Meso-NH IR
Meso-NH
2.5 km
12 UTC 21 May
00 UTC 22 May
12 UTC 21 May
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The IMPROVE Case

• Two 36-h run starting at 00 UTC 13 Dec 2001

40 km
10 km

• with ECMWF analysis
• with NCEP-AVN forecast

2.5 km
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Comparison with Goes-W Ch4

• 06 UTC 13 Dec

Observation
Meso-NH ECMWF
Meso-NH NCEP
00 UTC 14 Dec
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Comparison with Radar
MM5
SPOL
0042 UTC 14 Dec
0045 UTC 14 Dec
Model reflectivities at 700 hPa
(Gavert et al. 2004 submitted)
Meso-NH NCEP
Meso-NH ECMWF
0000 UTC 14 Dec
0000 UTC 14 Dec
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Vertical X-sections at 00 UTC 14 Dec
3D-ECMWF init
3D-NCEP init
2D-ideal case 4h
W temp
cloud
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Conclusion

• The Model-to-Satellite Approach
• Several case studies
• An indispensable tool
• for evaluating the cloud-schemes
• Realistic simulation of cloud weather systems
• Misleading representation of shallow clouds?
• Correct amount of precipitation?
• ?Use other spectral range than IR VIS and MW