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Cutting-Edge NIM: Advancing Global Weather Modeling with Nonhydrostatic Icosahedral Technology

Learn about the Nonhydrostatic Icosahedral Model (NIM) and its innovative approach to global weather modeling. Developed by active research groups worldwide, NIM aims to improve medium-range forecasting and climate predictions through high-resolution simulations. Explore its development history, advanced physics implementations, and operational tests. Utilizing GPU technology and multi-scale simulations, NIM promises accurate forecasts for various atmospheric phenomena. Stay updated on NIM's real-time runs, operational tests, and ongoing advancements in atmospheric science.

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Cutting-Edge NIM: Advancing Global Weather Modeling with Nonhydrostatic Icosahedral Technology

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  1. Nonhydrostatic Icosahedral Model (NIM)Jin Lee

  2. NIM Project Goal: • Active groups developing global non-hydrostatic models: • CSU-icosahedral model (Prof. Randall – Colorado State Univ.), • NICAM/Earth Simulator: Prof. Satoh • MPI/DWD, IAP – ICON project • NOAA/ESRL – FIM/NIM • NCAR/MPAS – Joe Klemp, Bill Skamarock • OLAM - Robert Walko • ECMWF – A nonhydrostatic global model (dx=6km) for medium range NWP. • NCEP - global WRF/NMM formulated on lat/lon grid • UKMO – ENDGame • GFDL/NASA • NRL & NPS - NUMA A non-hydrostatic global model for earth system modeling, and weather and intra-seasonal climate predictions.

  3. Weather Forecast (Initial Boundary Value Problem) Climate Projection (Forcing Problem) decadal, millennia Hydrostatic Global Models 0~2 weeks Non-Hydrostatic Limited Area Models • Lateral Boundary Limitation • Inadequate GCM Cumulus Parameterizations

  4. Weather/Climate Connection Weather Forecast (Initial Boundary Value Problem) Climate Projection (Forcing Problem) Intra-seasonal forecasts decadal, millennia Hydrostatic Global Models 0~2 weeks Non-Hydrostatic Limited Area Models Unified Approach: Global Cloud Resolving Model (GCRM) • GCRM to “Explicitly Resolve” Tropical Convective Cloud Systems • Lateral Boundary Limitation • Inadequate GCM Cumulus Parameterizations

  5. NIM Project Goal: • Active groups developing global non-hydrostatic models: • CSU-icosahedral model (Prof. Randall – Colorado State Univ.), • NICAM/Earth Simulator: Prof. Satoh • MPI/DWD, IAP – ICON project • NOAA/ESRL – FIM/NIM • NCAR/MPAS – Joe Klemp, Bill Skamarock • ECMWF – A nonhydrostatic global model for medium range NWP. • NCEP - global WRF/NMM formulated on lat/lon grid • UKMO – ENDGame • GFDL/NASA • NRL & NPS – NUMA • KMA ( Korea ) A non-hydrostatic global model for earth system modeling, and weather and intra-seasonal climate predictions.

  6. NIM Project Goal: • Active groups developing global non-hydrostatic models: • CSU-icosahedral model (Prof. Randall – Colorado State Univ.), • NICAM/Earth Simulator: Prof. Satoh • MPI/DWD, IAP – ICON project • NOAA/ESRL – FIM/NIM • NCAR/MPAS – Joe Klemp, Bill Skamarock • ECMWF – A nonhydrostatic global model for medium range NWP. • NCEP - global WRF/NMM formulated on lat/lon grid • UKMO – ENDGame • GFDL/NASA • NRL & NPS – NUMA • KMA ( Korea ) A non-hydrostatic global model for earth system modeling, and weather and intra-seasonal climate predictions.

  7. ESRL Finite-Volume Icos-Models (FIM/NIM) ESMF Non-Hydrostatic Hydrostatic • FIM • Flow-Following Finite-volume Icosahedral Model • Target resolution ≥ 10 km • A hydrostatic model consists of 2-D finite-volume SWM coupled with hybrid σ-θ vertical solver. • Produce accurate medium-range weather forecasts • NIM • Nonhydrostatic • Icosahedral Model • Target resolution : • O (1 km) and beyond • Extension of 2-D finite-volume integration into 3-D integration on control volume for multi-scales simuliations. • Use the latest GPU technology to speed up high-resolution model calculations.

  8. Development History of NIM Design Dynamics Physics Aqua-planet 2008 2009 2011 2012 • by Jin and MacDonald • Dynamical core test • Physics packages implement • Aqua-planet with dry physics • Aqua-planet simulation with full physics • Multiple processes (SMS) • GPU

  9. Development Plan of NIM Operational Tests Real data test runs Topography (1) Real-time Runs 2012 2013 2014 2015 • Real data preparation for NIM modeling systems • NIM real data medium range weather forecasts at 30 km • Global 4 km rapid refresh • Satellite hot start

  10. NIM multi-scales test cases:heat forced circulation,mountain waves, warm bubble,density current (cold bubble),Internal gravity waves,multi-months aqua-planet simulations

  11. Comparisons of vertical solvers with the warm bubble simulation. A rising thermal in an isentropic atmosphere.

  12. Explicit .vs. Implicit tri-diag solvers t= 0.0 min t= 0.0 min

  13. Explicit .vs. Implicit tri-diag solvers t= 1.0 min t= 1.0 min

  14. Explicit .vs. Implicit tri-diag solvers t= 2.0 min t= 2.0 min

  15. Explicit .vs. Implicit tri-diag solvers t= 3.0 min t= 3.0 min

  16. Explicit .vs. Implicit tri-diag solvers t= 4.0 min t= 4.0 min

  17. Explicit .vs. Implicit tri-diag solvers t= 5.0 min t= 5.0 min

  18. Explicit .vs. Implicit tri-diag solvers t= 6.0 min t= 6.0 min

  19. Explicit .vs. Implicit tri-diag solvers t= 7.0 min t= 7.0 min

  20. Explicit .vs. Implicit tri-diag solvers t= 8.0 min t= 8.0 min

  21. Explicit .vs. Implicit tri-diag solvers t= 9.0 min t= 9.0 min

  22. Explicit .vs. Implicit tri-diag solvers t= 10.0 min t= 10.0 min

  23. Explicit .vs. Implicit tri-diag solvers t= 11.0 min t= 11.0 min

  24. Explicit .vs. Implicit tri-diag solvers t= 12.0 min t= 12.0 min

  25. Explicit .vs. Implicit tri-diag solvers t= 13.0 min t= 13.0 min

  26. Explicit .vs. Implicit tri-diag solvers t= 14.0 min t= 14.0 min

  27. NIM density current simulation. Negative buoyancy to initiate density current.

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