assessment and analysis of a high-resolution reanalysis product for the scb oceanic circulation
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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 - PowerPoint PPT PresentationTRANSCRIPT
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Assessment and Analysis ofA High-Resolution Reanalysis Product
for the SCB Oceanic Circulation
Changming Charles Dong
Institute of Geophysical and Planetary PhysicsUniversity 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
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Outline
1. Introduction
2. Model Configuration and Data
3. Model Assessment
4. Dynamical Analysis (CTW, APG, Rossby Wave, Current Decomposition)
5. Summary
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Pacific Ocean Los Angeles
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(Strub and James, 2000, DSR)
Seasonal SST (AVHRR)and SSH (TOPEX)
SCB
CCS:
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(Digiacomo and Holt, 2001)
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(Digiacomo and Holt, 2001)
(Beckerbach and Washburn, 2004)
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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
3. Application Packages: Sediment transport, Biological processes, Wave-current interaction, pollution discharge, sea ice, et al….
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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
6.7km
1km
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Mean and Seasonal Variability
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ENSO Event
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Topex/Jason
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Eddy Variability
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1. Rossby Wave,
2. CTW, 3. APG,
4. Current Decomposition
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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.
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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)