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High-Resolution Baroclinic Ocean Simulations for the East Florida Shelf: Frontal Eddies to Reef Scale Processes Jerome Fiechter and Christopher N.K. Mooers.

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Presentation on theme: "High-Resolution Baroclinic Ocean Simulations for the East Florida Shelf: Frontal Eddies to Reef Scale Processes Jerome Fiechter and Christopher N.K. Mooers."— Presentation transcript:

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

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

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

4 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) EFS-POM ocean model Domain grid - Resolution

5 EFS-POM ocean model ForcingBoundary condition UA, VA (external) from U, V (30Sv, constant) in: inflow out: Flather radiation U, V (internal) thermal wind balance (inflow only) in: inflow out: Orlanski radiation T, S Levitus (monthly, 1ºx1º) in: Orlanski radiation out: Orlanski radiation Wind stress ETA winds (6-hourly, 2ºx2º) quadratic drag law (drag coef. = 10 -3 ) Heat flux Esbensen & Kushnir (monthly, 4ºx5º) long wave rad., latent, sensible, (penetrating) short wave rad. Open and surface boundary conditions - Summary

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

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

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

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

10 Summary SimulationObservations alongshore diameter 60-120 km100-200 km * cross-shore diameter 20-30 km (26N) 50-80 km (29N) 10-30 km (26N) * 30-50 km (30N) * propagation speed 40 km/day36 km/day # recurrence period (wavelength) 4-7 days (160-210 km) 5 days # (170 km) * Lee et al., 1991 # Johns and Schott, 1987 Frontal spin-off eddy event, February 1999

11 Remaining issues 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 Frontal spin-off eddy event, February 1999

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 ForcingBoundary condition UA, VA (external) mapping from EFS-POM E, W: Flather radiation N, S: Flather radiation U, V (internal) mapping from EFS-POM E, W: Marchesiello radiation N, S: Marchesiello radiation T, S mapping from EFS-POM E, W: Orlanski radiation N, S: Orlanski radiation Wind stress C-MAN winds (hourly, uniform) quadratic drag law (drag coef. = 10 -3 ) Heat flux Esbensen & Kushnir (monthly, 4ºx5º) long wave rad., latent, sensible, (penetrating) short wave rad. Open and surface boundary conditions - Summary Dry Tortugas high-resolution nested model (DT-POM)

14 Bottom temperature and velocity 1999 Hindcast simulation - DT model

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

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

17 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 Conclusions

18 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 Future Work

19 Questions and comments

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