Coastal Gulf of Alaska Grid
Here's a plot of the model domain.
- Resolution: ~3 km
- Area: 46.7-64.2 N and 132.1-162.7 W
- Parabolic Splines Density Jacobian Pressure Gradient
- Closed boundaries on North and East
- Open boundaries on South and West with:
- free-surface: Chapman condition
- tracers: radiation condition & passive/active
- 2D momentum: Flather condition
- 3D momentum: radiation condition & passive/active
- Large/McWilliams/Doney interior mixing
- LMD convective nonlocal transport
- LMD diffusivity due to shear instability
- KPP surface and bottom boundary layer mixing
- Laplacian mixing of tracers and momentum
- Enhanced horizontal mixing in sponge areas
- Mixing of tracers along geopotential surfaces
- Mixing of momentum along constant S-surfaces
- Fourth-order, centered differences horizontal momentum advection (2D)
- Third-order upstream bias horizontal advection of tracers and 3D momentum
- Default vertical advection of momentum
- Parabolic splines vertical advection of tracers
- Mass point sources and sinks - freshwater line source along the coast of
Alaska, and Copper, Stikine, Taku, Susitna, and Alsek rivers
- Forced with daily atmospheric variables and Bulk Flux formula
- Analytical shortwave radiation
- Tidal forcing along open boundaries by 8 components, filtered from
- Boundary conditions provided by NEP results
- Lagrangian floats
- Code is ROMS 2.0 run with distributed memory
The model was spun-up with NCEP winds during the year 2000, then run for 2001
with MM5 winds, and boundary conditions from the NEP run with MM5 winds.
Results show a strong Alaskan Coastal Current (ACC), and lots of 200-km scale eddies.
Surface floats show retention on banks and in eddies, and respond to downwelling
|Sea Surface Height
||Surface Floats and Sea Surface Height
Movie of sea surface height (meters), Dec. 8, 2000 - March 14, 2001.
Movie of sea surface height (meters) and surface floats, Dec. 8, 2000 -
March 9, 2001. Floats are reset to their initial positions every 16 days.
The time period Dec. 2000 through Feb. 2001 was re-run with NCEP forcing to
examine the effect of using the fine-scale MM5 winds. MM5's increased along-
shore orientation increases the strength of the ACC and causes eddies
to move through the area faster.
|Both Winds and Sea Surface Height Difference
||Cross-sections and Surface Density
Movie of surface wind from MM5 (black) and NCEP (red) in m/s, and the
difference in sea surface height (MM5-NCEP, meters) between model runs forced
with these winds.
A movie density in the region with MM5 (bottom) and NCEP (top).
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