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Visualization of GFDL/NOAA Climate Models

Visualization of GFDL/NOAA Climate Models. Prabhat LBNL/NERSC DOECGF April 30, 2008. Background. GFDL/NOAA awarded 800K hours at NERSC next generation of climate simulations Simulations run on Franklin (Cray XT4) Data Management for multiple TBs Production Quality Visualizations .

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Visualization of GFDL/NOAA Climate Models

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  1. Visualization of GFDL/NOAA Climate Models Prabhat LBNL/NERSC DOECGF April 30, 2008

  2. Background • GFDL/NOAA awarded 800K hours at NERSC • next generation of climate simulations • Simulations run on Franklin (Cray XT4) • Data Management for multiple TBs • Production Quality Visualizations

  3. Visualization requirements • Limitations with standard desktop tools • Ferret, IDL, GrADS, RenderMan, Blender • Handle large datasets (10s of GB) • NetCDF • Climate and Forecast (CF) conventions • Parallel processing • Presentation quality images/movies • Tool deployment at GFDL/NOAA

  4. GFDL/NOAA climate models (1/2) • cm2.4 • Coupled Ocean/Atmosphere/Ice/Land model • Atmosphere (1°), Ocean (0.25°) • Tri-Polar mesh • 1440x1070x50 grid • 150 variables • 12 timesteps • ~20GB • IPCC scenarios

  5. GFDL/NOAA climate models (2/2) • c360 • Atmosphere (0.25°) • Cube-Sphere mesh • Scales well, no FFT • 2160x2160x32 grid • 60 variables • 42 timesteps • ~25GB • Test runs for scaling to c2000

  6. VisIt • Satisfied all of our collaborators needs • Developed two plugins for climate models • Avoid expensive conversion process • Domain decomposition • Pseudocolor plots • Multiple overlays • Annotation tools • Spherical/planar projections • …

  7. Sample Results (cm2.4)

  8. Sample Results (c180/360)

  9. Some (un)expected lessons • Use familiar colormaps • Tool must have functionality to import colormaps (ncview->VisIt) • Scientists have learnt to interpret rainbow maps! • Simplify the plots • Static image vs. Dynamic animations • Be careful with rendering multiple fields

  10. Summary • Implemented functionality within VisIt with short turn-around time • Custom visualizations developed with scientist’s feedback • Presented at DOE meetings/SC07 • VisIt deployed at GFDL/NOAA

  11. Acknowledgements • GFDL/NOAA • V. Balaji, Tony Rosati • Chris Kerr, Remik Ziemlinski, Hans Valenkamp • LBNL/NERSC • Janet Jacobsen, Gunther Weber, Wes Bethel • Richard Gerber • LLNL • Hank Childs

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