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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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slide1

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

slide2

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)

slide3

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)

slide4

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)

slide5

EFS-POM ocean model

Open and surface boundary conditions - Summary

slide7

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

slide8

Frontal spin-off eddy event, February 1999

SST and SSHA daily animation

slide9

Frontal spin-off eddy event, February 1999

Eddy propagation along EFS shelf break (200m isobath)

slide10

Frontal spin-off eddy event, February 1999

Summary

* Lee et al., 1991

# Johns and Schott, 1987

slide11

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

slide12

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)

slide13

Dry Tortugas high-resolution nested model (DT-POM)

Open and surface boundary conditions - Summary

slide14

1999 Hindcast simulation - DT model

Bottom temperature and velocity

slide15

1999 Hindcast simulation - DT model

Vertical temperature and velocity structure at 24.7N

FEBRUARY 1999

AUGUST 1999

slide16

1999 Hindcast simulation - Tracer trajectories

February (e.g., grouper spawning) and August (e.g., coral spawning)

slide17

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
slide18

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