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Jerome Fiechter and Christopher N.K. Mooers Ocean Prediction Experimental Laboratory

High-Resolution Baroclinic Ocean Simulations for the East Florida Shelf: Frontal Eddies to Reef Scale Processes. 2003 Terrain-Following Ocean Models Users Workshop Seattle, 06-AUG-2003. Jerome Fiechter and Christopher N.K. Mooers Ocean Prediction Experimental Laboratory

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Jerome Fiechter and Christopher N.K. Mooers Ocean Prediction Experimental Laboratory

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  1. High-Resolution Baroclinic OceanSimulations for the East Florida Shelf:Frontal Eddies to Reef Scale Processes 2003 Terrain-Following Ocean Models Users Workshop Seattle, 06-AUG-2003 Jerome Fiechter and Christopher N.K. Mooers Ocean Prediction Experimental Laboratory Rosenstiel School of Marine and Atmospheric Science University of Miami

  2. Region of interest • Geographical domain • Straits of Florida • East Florida Shelf • Florida Keys reef tract • Circulation features • Florida Current • Gulf Stream • Loop Current • Tortugas gyre • Frontal eddies Source: NASA (MODIS image)

  3. Regional of interest East Florida Shelf coastal ocean model (EFS-POM) • Princeton Ocean Model (POM) • Curvilinear grid • Vertical sigma levels • SEA-COOS program • COMPS (USF) • EFSIS (UM) • SABSOON (UNC) (www.seacoos.org; www.efsis.rsmas.miami.edu)

  4. EFS-POM ocean model Domain grid - Resolution Horizontal: 251x101 nodes (~2-20km) Vertical: 25 σ-levels (~0.1-100m) – clustering in surface and bottom layers Min. depth: 5m (extended to physical coastline location)

  5. EFS-POM ocean model Open and surface boundary conditions - Summary

  6. 1999 Hindcast simulation - Seasonal cycle SST and SSH daily animation

  7. 1999 Hindcast simulation - Comparison with STACS data at 27N EFS-POM (1999) STACS (1983) EFS-POM (1999) STACS (1983) Temperature and normal velocity (STACS: 8 stations; EFS-POM: 30 nodes) Temperature (deg.C) Temperature (deg.C) Meridional velocity (m/s) Meridional velocity (m/s) yearly average standard deviation

  8. Frontal spin-off eddy event, February 1999 SST and SSHA daily animation

  9. Frontal spin-off eddy event, February 1999 Eddy propagation along EFS shelf break (200m isobath)

  10. Frontal spin-off eddy event, February 1999 Summary * Lee et al., 1991 # Johns and Schott, 1987

  11. Frontal spin-off eddy event, February 1999 • Formation and evolution • origin • decay and growth rates • “gap closure paradox” • Cross-shelf transport • heat, momentum • biochemical tracers • Sensitivity to forcing and numerical parameters • seasonal transport cycle • HORCON, TPRNI • grid type and resolution Remaining issues

  12. Dry Tortugas high-resolution nested model (DT-POM) Domain grid - Resolution Horizontal: 65x57 nodes (~1-2km) Vertical: 21 σ-levels (~0.1-10m) – clustering in surface and bottom layers Min. depth: 2m (no coastline)

  13. Dry Tortugas high-resolution nested model (DT-POM) Open and surface boundary conditions - Summary

  14. 1999 Hindcast simulation - DT model Bottom temperature and velocity

  15. 1999 Hindcast simulation - DT model Vertical temperature and velocity structure at 24.7N FEBRUARY 1999 AUGUST 1999

  16. 1999 Hindcast simulation - Tracer trajectories February (e.g., grouper spawning) and August (e.g., coral spawning)

  17. Conclusions • East Florida Shelf model (EFS-POM) is qualified to: • study large scale to mesoscale processes • investigate regional connectivity and recruitment (i.e., long-range dispersion processes) • Dry Tortugas model (DT-POM) is qualified to: • study submesoscale and reef scale processes • investigate self-seeding vs. export conditions (i.e., local retention processes) • relate benthic communities to flow dynamics

  18. Future Work • East Florida Shelf model (EFS-POM) • improve open boundary and surface forcing • increase horizontal and vertical resolution • validate further against observations • sensitivity study (num. param., forcing, resolution) • add ecosystem model (e.g., NPZD) • Dry Tortugas model (DT-POM) • improve nesting method • increase horizontal and vertical resolution • validate against observations • 3-D trajectories / biological behavior

  19. Questions and comments

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