ECCO 1/6 Atlantic Model

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• Test Runs
• Results with an older verion (c23, simple forcing)
• Test Runs
• Computational Costs
• First Output after 10.5 month of integration (test11):
• sea surface height
• potential temperature and velocity (only every second vector shown) in level 3

Grid

 

east-west	98W-18.5E	700 GP
--> folded	98W-1.83E	600 GP
north-south	21-79	600 GP
vertical	0-6525 m	30 GP

 

dz / m z / m dz /m  z /m dz / m z /m 10.0 10. 40.0 225. 245.0 1455. 10.0 20. 50.0 275. 290.0 1745. 10.0 30. 60.0 335. 340.0 2085. 12.5 42. 70.0 405. 395.0 2480. 15.0 58. 80.0 485. 460.0 2940. 17.5 75. 95.0 580. 535.0 3475. 20.0 95. 115.0 695. 625.0 4100. 25.0 120. 140.0 835. 725.0 4825. 30.0 150. 170.0 1005. 825.0 5650. 35.0 185. 205.0 1210. 875.0 6525.

Density Calculation

• New polynominal coefficients (POLY3.COEFFS) that reflect the new vertical discretization have been calculated using util/scripts/knudsen2/knudsen2.f

Topography

Interpolation from ETOPO5 onto the model grid, no smoothing Masking of regions: Pacific marginal seas (Baltic Sea, Hudson Bay, Melville Sound) lakes and (due to the interpolation) closed bights Setting of a one-point boundary Widening of the Strait of Gibraltar (3 GP) Rebuild of some islands: Canary Islands Madeira Azores Jan Mayen Bermuda Bahamas Caribic Capeverdes

• After manipulating the topography the whole domain was folded. An optimal folding line was calculated for i=600. So, parts of the North Atlantic and the Mediterranean appear on the American continent. The dimension in x-direction was reduced from imt=700 to imt=600

Initialization

• Potential temperatures and salinities of the Levitus et al. (1994) climatology were gap-filled and interpolated onto the model grid
• The data were folded and checked against the pmask

Surface Forcing

• Daily zonal and meridional wind stress data and net heat and salt surface fluxes of the period 1992-1997 were taken from the global 2 degree run of the global state estimation (iteration 60) and interpolated onto the model grid. Because of the lack of a mixed layer model the heat and salt surface fluxes are equally distributed over the first two vertical level.
• An additional restoring (time scale 60 days) to surface values of the monthly Levitus data is applied to the first two vertical level. This is done because of the remaining drift in the forcing fields at this number of interations.
• Two restoring zones, a 12 grid point wide at the northern limit and a 18 grid point wide at the southern limit of the domain (time scales vary from 5 to 60 days), are used to restore the full water column to monthly Levitus values. [Complete 3D restoring mask]