ESMF in Production at NCEP Mark Iredell Chief NCEPEMC Global Climate and Weather Modeling Branch May - PowerPoint PPT Presentation

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ESMF in Production at NCEP Mark Iredell Chief NCEPEMC Global Climate and Weather Modeling Branch May

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Title: ESMF in Production at NCEP Mark Iredell Chief NCEPEMC Global Climate and Weather Modeling Branch May


1
ESMF in Production at NCEP Mark
IredellChief NCEP/EMC Global Climate and
Weather Modeling BranchMay 23, 2006
NCEP where Americas climate, weather, and
ocean services begin
2
Outline
  • Motivation
  • Vision
  • Progress
  • Issues
  • Conclusion

3
Motivation
4
Impact of Observations and Numerical Forecast
System Technology Growth on Global Forecasts
NFS Tech Growth Obs
Obs only
NFS Tech Growth Computing Data
Assim. Models Ensembles
5
Why ESMF _at_ NCEP?
  • Most of the improvement in weather forecast skill
    over the past 20 years is due to improving
    numerical forecast system technology.
  • However, national investment in computing and
    model development in the geophysical sciences is
    both limited and dispersed.
  • Therefore, it behooves us to leverage this
    investment with a common modeling framework and
    shared software development.

6
Vision
  • my vision anyway, not necessarily everyones

7
ESMF Component Framework
8
NCEP component list (incomplete)
  • I/O components
  • ATM gridded component
  • GFS physics component
  • NAM physics component
  • GMAO physics component
  • GFS dynamics component
  • UMO dynamics component
  • Finite volume dynamics component
  • Post component
  • Surface cycling component
  • Coupler components
  • Land component
  • Ocean component
  • Ice component
  • Wave component
  • Surge component
  • Aerosol component
  • Ionosphere component
  • Mesoscale component
  • Change resolution coupler component
  • Dynamics/Physics coupler component
  • Ensemble coupler component
  • Atmosphere/Land coupler component
  • Atmosphere/Ice/Ocean coupler component
  • Atmosphere/Aerosol coupler component
  • Atmosphere/Ionosphere coupler component
  • Analysis/Model coupler component
  • Model/Post coupler component
  • Nested atmosphere components
  • Other couplers

only includes components with active ESMF plans
9
Progress
10
Progress with ESMF _at_ NCEP
  • The NCEP global forecast system (GFS) with a
    fully compliant ESMF adoption shall be
    implemented operationally in June 2006. (Yang,
    Moorthi, Young)
  • Features
  • Stand-alone gridded component (uses vm, delayout,
    grids and states from the ESMF superstructure)
  • Uses time manager, config, and log error from the
    ESMF infrastructure
  • No effect on results or timings

11
Cpl_Finalize
NCEP ESMF GFSE CONCURRENCY SYSTEM
Main Drive
Main Driver
Cpl_Initialize

G_I
G_I
G_I
G_I

G_R
G_R
G_R
G_R
Cpl_Run

G_R
G_R
G_R
G_R
G_I --- GFS Initialize G_R --- GFS Run G_F ---
GFS Finalize
Cpl_Run
..



..
.
G_R
G_R
G_R
G_R
.
G_F
G_F
G_F
G_F
END
12
Progress with ESMF _at_ NCEP
  • The GFS already runs successfully in ensemble
    mode (14 members run concurrently). A stochastic
    ensemble coupler is being developed. (Yang, Hou)
  • Promising progress toward making GFS component
    states in gridpoint rather than spectral space.
    (Juang)
  • The B-grid global/regional model (UMO) runs
    successfully as an ESMF gridded component.
    (Black)
  • Several other collaborations already support ESMF
    gridded components.

13
Issues
14
Costs/Benefits of ESMF _at_ NCEP
  • Community involvement and lovefests
  • Common framework for collaboration
  • Shared software burden
  • - Significant conversion effort
  • - Increased code complexity
  • - More black boxes

15
Costs/Benefits of ESMF _at_ NCEP
  • Ultimately, the key resources for NCEP (and other
    institutions) are its working scientists. We must
    ensure that any framework decisions are the best
    for our people to continue to develop and
    maintain world-class geophysical models.
  • ESMF allows each institution to find its comfort
    level in adopting the framework.

16
Conclusion
  • NCEP continues to participate as a partner in the
    ESMF experience.
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