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ROMS Development and Operational Forecast

ROMS Development and Operational Forecast. 1. Development of a Multi-Level Parallel Adaptive ROMS John Lou, Yi Chao, Zhijin (Gene) Li (all at JPL) 2. ROMS and “Grid” Computing Xiaochun Wang, Alex Li, Yi Chao, Peggy Li (all at JPL)

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ROMS Development and Operational Forecast

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  1. ROMS Development and Operational Forecast • 1. Development of a Multi-Level Parallel Adaptive ROMS • John Lou, Yi Chao, Zhijin (Gene) Li (all at JPL) • 2. ROMS and “Grid” Computing • Xiaochun Wang, Alex Li, Yi Chao, Peggy Li (all at JPL) • 3. Development of a Real-Time Operational Forecasting System using ROMS • Yi Chao, Zhijin (Gene) Li, Peggy Li, Jei-Kook Choi, Xiaochun Wang, Alex Li (All at JPL) • Jim McWilliams, Patrick Marchesiello, Xavier Capet (UCLA) • Fei Chai (Univ. of Maine), Dick Barber (Duke Univ.), Francisco Chavez (MBARI)

  2. 1. Development of a Multi-Level Parallel Adaptive ROMS • PARAMESH (Parallel Adaptive Mesh Refinement) is a package of Fortran 90 subroutines designed to provide an application developer with an easy route to extend an existing serial code which uses a logically cartesian structured mesh into a parallel code with adaptive mesh refinement (AMR). http://esdcd.gsfc.nasa.gov/rib/repositories/inhouse_gsfc/Users_manual/amr.html • Pyramid (Parallel Unstructured Adaptive Mesh Refinement Library) is a software library for performing parallel adaptive mesh refinement (AMR) on unstructured meshes. http://www-hpc.jpl.nasa.gov/APPS/AMR/

  3. Application Examples of PARAMESH: 3D AMR

  4. Open Ocean B.C. Open Ocean B.C. US West Coast Open Ocean B.C. A Multi-Level Adaptive Grid for ROMS • Adaptive refinement on longitude-latitude planes of a 3D ocean grid

  5. Information exchange across grid levels Timelines of a Multi-level Program (1-D) Level one Level two Level three

  6. 3D time-stepping on grid blocks at all levels 2D time-stepping on bocks at all levels The Computational Flow of Adaptive ROMS Multi-level block-structured grid generation (load-balancing) Increment global dt Read input fields to coarse grid All-level guard cell exchanges for relevant fields Set parameters for multi-level grid (grid scale, land masks, time steps.) Update of open boundary condition Interpolate input fields from coarse grid blocks through the grid tree to all refined levels • For each time step of outer time-stepping loop: • Perform Ni time steps of 3D updates at grid level i • For each 3D update • Perform M steps of 2D updates • Same-level guard-cell exchanges • for each 2D update • Same-level guard cell exchanges for • each 3D update • All-level guard cell exchanges for all relevant variables All-level guard cell exchanges ready for time-stepping

  7. 2. ROMS & “Grid” Computing

  8. Pacific, US West Coast, & California ROMS

  9. JPL Data Server COAMPS Data Server MBARI AOSN Data Server Data Retrieval & Processing ROMS (L1, L2 L3, 3-L nested) Ancillary Data DAS ROMS OurOcean LAS SGI Computer 3. ROMS Real-Time Operational Forecasting

  10. ROMS Configurations Pacific basin-scale ROMS (providing boundary conditions for the regional ROMS) 3-level nested coastal ROMS: 15/5/1.5 km

  11. 3-km COAMPS forecast, Aug. 5 Update of Real-Time Wind ForcingAug. 4, 2003 3-km COAMPS analysis, Aug. 4 25-km blended COAMPS/QuikSCAT analysis 3-km COAMPS forecast, Aug.6

  12. Real-Time Stand-alone ROMS without DAS Aug. 4, 2003 L1 ROMS (15-km) L2 ROMS Coupled Phys-Bio (5-km) (http://ourocean.jpl.nasa.gov)

  13. Real-Time L3 ROMS-DASAug. 5 (24 hours forecast from 08/04)

  14. Real-Time L3 ROMS-DASAug. 6 (48 hours forecast from 08/04)

  15. AOSN (Adaptive Ocean Sampling Network): Monterey Bay August 2003 Experiment Integrated Ocean Observing and Prediction Systems

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