noaa global modeling workshop 12-13 january 2006noaa/esrl fim contribution toward future noaa global...
DESCRIPTION
NOAA Global Modeling Workshop January 2006NOAA/ESRL Goals for NOAA future model development (per GSD) Design for weather (1h to 2 weeks) and climate applications Applicable at 1-4 km resolution Accurate for moisture, entropy, and tracer transport Quasi-Lagrangian vertical coordinate Minimize cross-coordinate vertical transport Grid with nearly constant map scale without singularities Contribute diversity to NCEP global ensemble systemTRANSCRIPT
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NOAA Global Modeling Workshop12-13 January 2006 NOAA/ESRL
FIM • Contribution toward future NOAA global modeling system• Developed at ESRL, collaboration so far with GFDL, EMC
NOAA/ESRL
Status on Development of FIM Flow-following FV Icosahedral Model Sandy MacDonaldJin-luen LeeRainer BleckStan BenjaminJohn Brown
- presented by Stan BenjaminCourtesy – D. Randall
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NOAA Global Modeling Workshop12-13 January 2006 NOAA/ESRL
FIM Dynamic Core
Finite volume, flux form equations in horizontal (planned - Piecewise Parabolic Method)
Hybrid isentropic-sigma ALE vertical coordinate (arbitrary Lagrangian-Eulerian)- Flow-following
Icosahedral grid, with spring dynamics implementation
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NOAA Global Modeling Workshop12-13 January 2006 NOAA/ESRL
Goals for NOAA future model development
(per GSD)• Design for weather (1h to 2 weeks) and climate applications
• Applicable at 1-4 km resolution
• Accurate for moisture, entropy, and tracer transport
• Quasi-Lagrangian vertical coordinate
• Minimize cross-coordinate vertical transport
• Grid with nearly constant map scale without singularities
• Contribute diversity to NCEP global ensemble system
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NOAA Global Modeling Workshop12-13 January 2006 NOAA/ESRL
FIM development – Task Plan
FY2006 Goals• Overall - Complete global circulation model (GCM) version • Incorporate GFS physics package• Perform idealized tests (e.g., Held-Suarez, transport of actual vs. proxy PV, e)• Design for optimal computational efficiency on non-structured (icosahedral) horizontal grid• Design appropriate - ALE coordinate for global 1-20km application
FY2007 Goals• Switch from idealized to observed initial conditions• Work with EMC on incorporating FIM dynamic core into FY07 GFS version suitable for alternative dynamic cores• Develop non-hydrostatic version of FIM• Collaborate with other NOAA research partners to develop and test further refinements
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NOAA Global Modeling Workshop12-13 January 2006 NOAA/ESRL
Icosahedral grid• 6 rhombi covering sphere• All point volumes - hexagons (except 12 points at rhombi corners - pentagons)• Map-scale factor variation – 0.95• Grid resolution example - level-5 icosahedral grid – 240km resolution)
((2**n)**2)*10 + 2 = no. cells
5th level -(32**2)*10 + 2 = 10242 ~240km resolution6th level – 40962 cells ~120km resolution7th level – 163842 cells ~60km resolution8th level – 655,362 cells ~30km resolution9th level – 2,621,442 cells ~15km resolution
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NOAA Global Modeling Workshop12-13 January 2006 NOAA/ESRL
Diagrams - Randall et al. – Colorado State Universityhttp://kiwi.atmos.colostate.edu/DOE_Cooperative_Agreement/pdf/CISE.pdf
240km icosahedral gridLevel-5 – 10242 polygons
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NOAA Global Modeling Workshop12-13 January 2006 NOAA/ESRL
Grid Structure
Finite volume application- flux into each from from surrounding donor cells- S.-J. Lin formulation for lat/lon global model, successfully adapted to icosahedral grid by Lee and MacDonald in collaboration with Lin
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NOAA Global Modeling Workshop12-13 January 2006 NOAA/ESRL
Test of 2-layer version of FIM – baroclinic instability
Initial condition set with sloping temperature gradient
Grid-level 5 – 240 km resolution, no physics
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FIM design – vertical coordinate
Hybrid (sigma/ isentropic) vertical coordinate of the arbitrary Lagrangian-Eulerian (ALE) flavor
• Used in NCEP Rapid Update Cycle (RUC) model
• Used in HYCOM ocean model
Builds on work by RUC group (Stan Benjamin), Rainer Bleck, non-ALE flavors of CSU group (Dave Randall), Henry Juang (EMC) and others . . .
Applicable down to 1-km non-hydrostatic scale by using larger-scale 3-d isentropic variation as part of FIM target coordinate definition
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"Hybrid" means different things to different people:
- linear combination of 2 or more conventionalcoordinates (examples: sigma, z+rho, z+rho+sigma)
- ALE (Arbitrary Lagrangian-Eulerian) coordinate
ALE maximizes size of isopycnic subdomain (isentropic subdomain for atmospheric model)
- From Rainer Bleck HYCOM/ocean model talk
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Terrain height - dm
Test applicability of RUC-like hybrid - ALE coordinate to global domain
NAM data interpolated to current RUC coordinate using Asia terrain field-13km dx
Case –12h NAM data valid 30 Aug 200500 UTC
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NAM data interpolated to current RUC coordinate using Asia terrain field-13km dx
Case –12h NAM data valid 30 Aug 200500 UTC
Adjustments planned• Relaxed sigma layer compression up to 400 hPa• Reference v levels down to 200 K (currently 232K in RUC)
South North
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NOAA Global Modeling Workshop12-13 January 2006 NOAA/ESRL
FIM development – Task Plan
FY2006 Goals• Overall - Complete global circulation model (GCM) version • Incorporate GFS physics package• Perform idealized tests (e.g., Held-Suarez, transport of actual vs. proxy PV, e)• Design for optimal computational efficiency on non-structured (icosahedral) horizontal grid• Design appropriate - ALE coordinate for global 1-20km application
FY2007 Goals• Switch from idealized to observed initial conditions• Work with EMC on incorporating FIM dynamic core into FY07 GFS version suitable for alternative dynamic cores• Develop non-hydrostatic version of FIM• Collaborate with other NOAA research partners to develop and test further refinements,