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Participation à DCMIP 2012
GEM Lat-Lon versus GEM Yin-Yang
Abdessamad QaddouriVivian LeeMonique TanguayClaude Girard
Collaboration: Bernard Dugas, Ayrton Zadra et Paul Vaillancourt
DCMIP = Dynamical Core Model Intercomparison Project
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Droits d’auteurs: Plusieurs éléments de la présentation sont extraits du site DCMIP 2012
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3D Advection: Test 11 (3D deformational flow)
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Correlated tracers in a reversing sheared flow
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Q1
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LL YY
Test 11 Near 4900 m t= 6 days Q1
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Tracer q is stretched thin after 12 h, but it is still resolved,comes back to its original position after 1 day
3D Advection: Test 12 (Hadley-cell like circulation)
Animation CAM-FV
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LL YY
Test 12 medium L60 t= 12 hours
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3D Advection: Test 13 Solid body rotation of thin cloud tracer in presence of orography
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days HEIGHT levels
Animation GFDL FV3
days MODEL levels
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LL YY
Test 13 L60 (Model levels) t=T/2
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Evaluate accuracy of the pressure-gradient calculation over a Schaer-type mountain
Test 20 (Steady-State Atmosphere at Rest in Presence of Orography)
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LL YY
U
W
LL YY
Test 20 L15 t= 6 days
Scale*10
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Vertical advection: Eulerian Schemelinear extrapolation near boundaries
is not only possible but in fact effective
Semi-Lagrangian scheme:a similar approach (linear extrapolation)
is not only possible but no doubt desirableIt is now being developed for GEM
=0
σσσσσσσσ
∂∂−=
∂∂ F
tF
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LL
U
W
LL
Test 20 L15 t= 6 days
• Corrections à No Top thermodynamic level(Claude et André)
• Extrapolation linéaire• Rcoef (0,2)
Same Scale
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Radius of the Earth is scaled so that the simulation is in the non-hydrostatic domain
1
R top) model near the(Spongefriction Rayleigh
Velocity Angular
Step Time
Radius
>
=
Ω=Ω
∆=∆
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X
RX
XX
tt
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a a
ref
ref
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SMALL PLANET
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Test 21: Without Wind Shear (Reducedsize Earth with a circumference at the equator of 80 km)
X=500
Animation MCORE
Test 21 (Flow over Topography, Gravity waves Without Wind Shear)
Reducedsize Earth with a circumference at the equator of 80 km and No rotationx 333.6 m z = 500 m
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Schär’s case of Claude (Slice GEM)
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Distinguishes between Hydrostatic and NonHydrostatic responses
ENDGAME
Test 21 T’ t=3600 s
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LL YYTest 21 T’ t=3600 s
IFS
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X=500
Animation MCORE
Test 22 (Flow over Topography, Gravity waves With Wind Shear)
Reducedsize Earth with a circumference at the equator of 80 km and No rotationx 333.6 m z = 500 m
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Test 22 T’ t=3600 sLL YY
IFS
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X=125
Non-orographic Gravity wavesReducedsize Earth with a circumference at the equator of 320 km and No rotationx 1 km z = 1 km
Animation NIM
Animation MCORE
Example of NonHydrostatic responsein potential temperature ’
Test 30 (Warm Bubble Triggered Gravity Waves)
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Test 31 L10 Theta’ t=3600 s
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Test 31 L10 Theta’ t=1200 sLL YY
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LLTest 31 Theta’ t=1200 s Test 31 Theta’ t=3600 s
ENDGAME
• Corrections à No Top thermodynamic level(Claude et André)
• Extrapolation linéaire
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X=1,10,100,1000
Test 41X (Dry Baroclinic Instability)Steady-State Zonal Wind
perturbation
+(20E,40N)
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Full time series 1 deg L30 NonHydrostatic over 15 days
Animation IFS
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ICON-MPI-DWD
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YYLLX=1
X=10
X=100
X=1000
Test 41X Surface pressure t=Day 9
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+ Aqua-Planet (Terre couverte d’eau à 29ºC SST)
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Test 42 (Moist Baroclinic Instability)
Large-scale condensation in a moist baroclinic waveleads to an intensificationin CAM-FV (1 deg L30), here at Day 9
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LL
YY
LL YY
Test 42 1 deg L30 t=Day 9
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Test 51 (Tropical Cyclone with Simplified Physics)
Idealized Tropical Cyclone on Aqua-Planet: Simulations with Simplified Physics
100 m
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Animation NIM
Evolution of the tropical cyclone for 10 days (L30) Wind speed at the 2nd model level (~150 m)
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CAM5-FV .25 deg L30
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1. deg L30
Day 3 Day 5 Day 10
LL
YY
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.5 deg L30
Day 3 Day 5 Day 10
LL
YY
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LL
.25 deg L30 The intensity increases with the resolutionThe cyclone is more concentrated in space with the resolution
Day 3 Day 5 Day 10
YY
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Test 52 (Tropical Cyclone with Full Physics) OPTIONAL
Idealized Tropical Cyclone on Aqua-Planet: Simulations with Full Physics .5 deg L30
Animation CAM-SE
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SimplePhysics
FullPhysics
CAM5-FV 0.25 L30
Expansion of the cyclone with time when Full Physics
Eye of the cyclone clearly defined
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Day 3 Day 5
.5 deg L30
LL
YY
Day 10
Several small cyclones at Day 10 …
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SOMMAIRE
• GEM Yin-Yang et GEM Lat-Lon ont participé au projet DCMIP 2012.
• Les testcases comprennent des advections pures, des ondes de gravité orographique et non-orographique sur une planète sans rotation, des simulations Petite Planète pour obtenir un signalNonHydrostatique à faible coût de calcul, des ondes baroclines sèches et humides et des cyclones tropicaux avec physique simplifiée.
• GEM Yin-Yang et GEM Lat-Lon donnent des réponses très semblables.
• Les Test20 et Test31 ont été utiles pour comprendre et corriger une faiblessedans l’advection semi-Lagrangienne près du toit et du sol.
• Pour le Test 52 (Pleine Physique, OPTIONNEL), GEM ne peut maintenir un cyclone unique jusqu’au Jour 10. Un ajustement incomplet d’Aqua-Planèteen lien avec la radiation est probablement en cause.
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