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NOAA Global Modeling Workshop 12-13 January 2006NOAA/ESRL FIM Contribution toward future NOAA global modeling system Developed at ESRL, collaboration so.

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Presentation on theme: "NOAA Global Modeling Workshop 12-13 January 2006NOAA/ESRL FIM Contribution toward future NOAA global modeling system Developed at ESRL, collaboration so."— Presentation transcript:

1 NOAA Global Modeling Workshop 12-13 January 2006NOAA/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 MacDonald Jin-luen Lee Rainer Bleck Stan Benjamin John Brown - presented by Stan Benjamin Courtesy – D. Randall

2 NOAA Global Modeling Workshop 12-13 January 2006NOAA/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

3 NOAA Global Modeling Workshop 12-13 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 system

4 NOAA Global Modeling Workshop 12-13 January 2006NOAA/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

5 NOAA Global Modeling Workshop 12-13 January 2006NOAA/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 5 th level - (32**2)*10 + 2 = 10242 ~240km resolution 6 th level – 40962 cells ~120km resolution 7 th level – 163842 cells ~60km resolution 8 th level – 655,362 cells ~30km resolution 9 th level – 2,621,442 cells ~15km resolution

6 NOAA Global Modeling Workshop 12-13 January 2006NOAA/ESRL Diagrams - Randall et al. – Colorado State University http://kiwi.atmos.colostate.edu/DOE_Cooperative_Agreement/pdf/CISE.pdf 240km icosahedral grid Level-5 – 10242 polygons

7 NOAA Global Modeling Workshop 12-13 January 2006NOAA/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

8 NOAA Global Modeling Workshop 12-13 January 2006NOAA/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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46 NOAA Global Modeling Workshop 12-13 January 2006NOAA/ESRL 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

47 NOAA Global Modeling Workshop 12-13 January 2006NOAA/ESRL "Hybrid" means different things to different people: - linear combination of 2 or more conventional coordinates (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

48 NOAA Global Modeling Workshop 12-13 January 2006NOAA/ESRL 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 2005 00 UTC

49 NOAA Global Modeling Workshop 12-13 January 2006NOAA/ESRL NAM data interpolated to current RUC coordinate using Asia terrain field -13km dx Case – 12h NAM data valid 30 Aug 2005 00 UTC Adjustments planned Relaxed sigma layer compression up to 400 hPa Reference  v levels down to 200 K (currently 232K in RUC) South North

50 NOAA Global Modeling Workshop 12-13 January 2006NOAA/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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