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Assessment and Analysis of A High-Resolution Reanalysis Product for the SCB Oceanic Circulation

Assessment and Analysis of A High-Resolution Reanalysis Product for the SCB Oceanic Circulation Changming Charles Dong Institute of Geophysical and Planetary Physics University of California, Los Angeles Collaborators: Eileen Y. Idica , James C. McWilliams

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Assessment and Analysis of A High-Resolution Reanalysis Product for the SCB Oceanic Circulation

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  1. Assessment and Analysis of A High-Resolution Reanalysis Product for the SCB Oceanic Circulation Changming Charles Dong Institute of Geophysical and Planetary Physics University of California, Los Angeles Collaborators: Eileen Y. Idica, James C. McWilliams Acknowledgements: M.Hughes, A. Hall, C. Winant, E. Dever, L. Washburn, B. Hickey, M. Noble, C. Zhang, Y. Chao, E. Di Lorenzo, M. Blaas, LACSD

  2. Outline • Introduction • Model Configuration and Data • Model Assessment • Dynamical Analysis (CTW, APG, Rossby Wave, Current Decomposition) • Summary

  3. Pacific Ocean Los Angeles

  4. SCB Seasonal SST (AVHRR) and SSH (TOPEX) CCS: (Strub and James, 2000, DSR)

  5. (Digiacomo and Holt, 2001)

  6. (Beckerbach and Washburn, 2004) (Digiacomo and Holt, 2001)

  7. Regional Oceanic Model System (ROMS) 1. It solves the primitive equations with the oceanic currents, potential temperature, salinity and the equation of state. It is a community model, and its source codes are open. More details, see the official website www.myroms.org • 2. hydrostatic/non-hydrostatic versions • Application Packages: Sediment transport, Biological processes, • Wave-current interaction, pollution discharge, sea ice, et al….

  8. Regional Oceanic Model System (ROMS) One-way nested grids (~20km  ~6.7km  1km) Surface Forcing (MM5 18km, 6km, 2 km) Open Boundary Data (SODA, Carton et al, 2000a,b, JPO) Levitus Climatological Data (IC) Integration from 1996-2003 20km 1km 6.7km

  9. Mean and Seasonal Variability

  10. ENSO Event

  11. Topex/Jason

  12. Eddy Variability

  13. 1. Rossby Wave, • 2. CTW, • 3. APG, • 4. Current Decomposition

  14. Summary • ROMS is employed to study the domain-scale circulation • in Southern California Bight forced by MM5 and SODA. • The model is integrated over eight-year (1996-2003) • The mean circulation and its interannual, seasonal variability • are comparable with the observations. • Eddy variability in the SCB oceanic current system is presented. • CTW, APG, Rossby Wave, and Current decomposition are • analyzed briefly.

  15. Current and Next Steps 1. Synoptical Scale Assessment 2. Extend the solution to the current year (2004 to 2007). and then make the reanalysis product accessible to the public online. (a proposal submitted to PISCO with D. Siegel et al) 3. Downscaling the Santa Barbara Channel (with T. Dickey)

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