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HYCOM for Ocean Modeling at NCEP

Explore the HYCOM ocean model and its operational components, including observational systems, numerical models, assimilation schemes, data distribution, and integrated services. Benefit from its robustness, accuracy, and modular design for efficient operations. Foster collaboration and coordination for continuous improvement.

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HYCOM for Ocean Modeling at NCEP

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  1. HYCOM for Ocean Modelingat NCEP Carlos Lozano MMAB/EMC/NCEP April 23 2007

  2. context • Operational oceanography components and activities are distributed within and across institutions. • Observational Systems • Numerical models: physical, bio-geochemical, waves, etc. • Assimilation schemes • Distribution of data • Services • Integration and coordination within each component and across components is necessary for progress.

  3. (Some) attributes of a model for operations • Robust and efficient for operations • Skill to represent processes of interest • Modular and amenable to improvement • Active and productive community working for the model (class). • Proven efficient and accurate integrated • Parameterizations of not resolved processes • Data assimilation schemes • Pertinent inter-disciplinary models

  4. Models at NCEP • Climate Outlook: • Atmosphere-Ocean coupled model: MOM and GFS • 3DVar (Rosati-Derber) • Short Term Forecast • NW Atlantic: POM; OI. • Atlantic Sector: HYCOM; 3DVar

  5. Ocean Forecast Systems:Immediate Objectives • Routine estimation of the ocean state [T, S, u, w, ssh]. • Daily 0-4 week forecast • Every 5 years, re-analysis • Help to improve estimation in (nested) sub-domains • Help to improve the estimation of the atmosphere state • In short term global forecast • In short term regional forecast • Hurricane • US regional • Help to improve the estimation of chemical components (water quality) and organisms distributions in the water(ecosystems).

  6. Ocean Forecast Systems:general configurations • Ocean standalone Global Basin(*) and sub-basin systems for the Atlantic and Pacific(**)(0-1 week) • Coupled Global atmosphere-ocean (***) (0-4 weeks) • Event driven coupled regional atmosphere-ocean (0-1 week) Tropical and extra-tropical storms • Event driven coupled ocean physical-bio-geochemical (0-4 weeks). • Event driven coupled ocean physical-physical (0-1 week). *Eddy permitting to eddy resolving, **Eddy resolving, ***Replacing standalone.

  7. WRF-HYCOM Coupling Strategy Atmosphere: • WRF coarse domain one way nested to GFS. • WRF fine Hurricane tracking domain two way nested to WRF coarse. • WRF coarse domain configuration is changed every forecast cycle: ‘jumping grid’. Ocean: • HYCOM regional one way nested to RTOFS. • HYCOM regional domain configuration is changed every forecast cycle: ‘jumping grid’. Ocean-Atmosphere: • Two way information exchange in over-lapping region.

  8. And some final examples in integration • Integrated software infra-structure. • Across institutions • Common protocols for • Model and forecast validation • Monitoring and diagnostics • Ensemble forecasts • multiple realizations • multiple models • multiple institutions • Adaptive sampling [model, data assimilation, observing system]

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