model for prediction across the scales-atmosphere (mpas-a ... · dynamics nonhydrostatic horizontal...

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, info@vortexfdc.com 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

Montornes et. al, info@vortexfdc.com 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

Montornes et. al, info@vortexfdc.com 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, info@vortexfdc.com 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

Montornes et. al, info@vortexfdc.com Vortex

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

Montornes et. al, info@vortexfdc.com Vortex

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, info@vortexfdc.com 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,..)

Montornes et. al, info@vortexfdc.com Vortex

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

Montornes et. al, info@vortexfdc.com Vortex

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

Montornes et. al, info@vortexfdc.com Vortex

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, info@vortexfdc.com 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, info@vortexfdc.com 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, info@vortexfdc.com 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

Montornes et. al, info@vortexfdc.com 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, info@vortexfdc.com 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, info@vortexfdc.com 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, info@vortexfdc.com 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, info@vortexfdc.com 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, info@vortexfdc.com 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, info@vortexfdc.com Vortex

MPAS-A: A first view in the Mediterranean basin