Model for Prediction Across Scales-Atmosphere (MPAS-A)
A first view in the Mediterranean basin
Alex Montornès
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Atmospheric modeling 90s and 2000s: LAM nesting
1 m 10 m100 m
1 km10 km
100 km
1.000 km
10.000 km
1 h
1 day
1 week
1 Month
1 Year
10 Years
100 Years
1000 Years
10 min
1 min
10 s
1 s
<0.1 s
Synoptic scale
Mesoscale
Planetary waves
Seasonal
ENSO
100.000 km
Climate variations
Microscale
Climate
models
Global
models
Mesoscale
models
Small eddies
Molecular diffusion
ClimateMeteorology
Fluid dynamics
10 cm1 cm
<1 mm
Large Eddy
Simulation
SGS
Characteristic length
Chara
cte
ristic
tim
e
Dynamicaldownscaling
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MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Structured Cgrid staggering
uu
u uu
u
v
v
vv
v
v
Limited area models as WRF
Mercator Lambert conformal Polar stereographic
Projections
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Structured Cgrid staggering
uu
u uu
u
v
v
vv
v
v
Limited area models as WRF
Mercator Lambert conformal Polar stereographic
Projections
GlobalWRF
Source: MPAS tutorial
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Structured Cgrid staggering
uu
u uu
u
v
v
vv
v
v
Limited area models as WRF
Mercator Lambert conformal Polar stereographic
Projections
GlobalWRF
Source: MPAS tutorial
Deformation due to projections.
Nesting approach :: seamless model limitation
Poor interaction between scales (1way/2way nesting)
Polar isses
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MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Unstructured grid: a different approach
u
u
u
u
u
u u
u
u
u
u
uu
u
u
Unstructured Cgrid staggering Variable resolution
Dx
Dx
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MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Unstructured grid: a different approach
u
u
u
u
u
u u
u
u
u
u
uu
u
u
Unstructured Cgrid staggering Variable resolution
Dx
Dx
Projection is not required
Seamless modeling chain (without nesting)
No polar issues
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
MPAS: Model Prediction Across Scales.
Earthsystem component models collectively known as MPAS:
All MPAS components use centroidal Voronoi tessellations for their horizontal meshes.
Common software framework between components and partially with WRF
MPASOcean(LANL)
MPASAtmosphere(NCAR)
MPASLand/Sea Ice(Albany U, LANL,..)
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MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
DYNAMICS
Nonhydrostatic
Horizontal velocity is defined as the normalvelocity on Voronoi cell faces.
State variables are defined at the cell centers.
For the vertical coordinate a structured grid isassumed, the model can use traditional sigmacoordinates as well as a Hybrid Coordinatesystem as in last versions of WRF.
MPASAtmosphere
PHYSICS
Surface Layer: MoninObukhov as in WRF 3.8.1,MYNN as in WRF 3.6.1.
PBL: YSU as in WRF 3.8.1, MYNN as in WRF3.6.1.
LSM: Noah as in WRF 3.3.1.
Gravity Wave Drag: YSU GWDO as in WRF3.6.1.
Convection: KainFritsch as in WRF 3.2.1,Tiedtke as in WRF 3.3.1, New Tiedtke as in WRF(3.8.1), GrellFreitas as in WRF 3.6.1.
Microiphysics: WSM6 as in WRF 3.8.1,Thompson as in WRF 3.8.1, Kessler
Radiation: RRTMG sw as in WRF 3.8.1, RRTMGlw as in WRF 3.8.1, CAM as in WRF 3.3.13.5
MESHES
Global model version.
Quasiuniform and variable resolution grids
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MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Applications
WRF MPAS
Urban meteorology
LES modeling
Obs/grid nudging
applications
Fire model coupling
Global NWP
Integrated
global/regional NWP
Global atmospheric
chemistry
Global/regional
climate modeling
Seasonal prediction
Regional NWP
Tropical cyclone/hurricane
prediction
Convection permitting hazardous
forecasting
Regional atmospheric chemistry
Ensemble (EnKf), variational and
Hybrid DA
Idealized simulations accross
scales
Regional air quality
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MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
MPAS-A: Strengths and Weaknesses
BENEFITS
All scales are solved at the same time.
Common physical packages with WRF (NCAR UnifiedAtmosphere Modeling Roadmap).
Scaling improvement.
LIMITATIONS
High memory consumption
Quasiuniform mesh at 60 km: 163.842 cellsVariable resolution grid 9225 km: 163.842 cells
~30 GB
Variable resolution grid 6010 km: 999.426 cellsVariable resolution grid 153 km: 6.488.066 cells
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
ExperimentsExperiments
Reanalysis: ERA5
Initialization: 20151210 18:00 h
Spinup: 6 hours
Effective horizon: 24 hours
Output: hourly
LBC: updated every hour
WRF 3.6.1
Domain: 120x120 = 14,400 cells x 38 levels
Resolution: 60 km
Physics:
SW: RRTMGLW: RRTMGSfc layer: ETASimilarityLSM: 5layer thermal diffusionPBL: YSUCumulus: KainFritschMicrophysics: WSM6
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
ExperimentsExperiments
Reanalysis: ERA5
Initialization: 20151210 18:00 h
Spinup: 6 hours
Effective horizon: 24 hours
Output: hourly
LBC: none (global model)
MPASA 6.0
Domain: 163,842 cells x 38 levels (global)
Resolution: 60km quasiuniform mesh
Physics:
SW: RRTMGLW: RRTMGSfc layer: ETASimilarityLSM: 5layer thermal diffusionPBL: YSUCumulus: KainFritschMicrophysics: WSM6
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
ExperimentsExperiments
Reanalysis: ERA5
Initialization: 20151210 18:00 h
Spinup: 6 hours
Effective horizon: 24 hours
Output: hourly
MPASA 6.0
WRF 3.6.1
Reanalysis: ERA5
Initialization: 20151210 18:00 h
Spinup: 6 hours
15º 45º
55º
20º
0.5º
Regridding
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MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Results: 2meter temperature
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Results: 2meter temperature
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Results: 2meter temperature
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Results: 2meter water vapor mixing ratio
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Next steps
Tests with variable resolution meshes
Full validation: Long period Different regions 3D fields Model options Explore applications New products
Regional MPAS with LBC (expected 2019)
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin
Model for Prediction Across Scales-Atmosphere (MPAS-A)
A first view in the Mediterranean basin
Alex Montornès
7th International Conference on Meteorology and Climatology of the Mediterranean 2019
Montornes et. al, [email protected] Vortex
MPAS-A: A first view in the Mediterranean basin