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Three very high resolution simulations of the North Atlantic were performed, with resolution of 1/12o (mesh size on the order of 6 km on average). This configuration provides a satisfactory result for the Gulf Stream separation, supporting the view that an inertial boundary layer (achieved by the fine grid resolution) is an important factor in the separation process. The computational requirements are extreme for basin-scale ocean modeling at the resolutions of interest (less than 10 km) (Bleck et al., Parallel Computing, 1995).
Run 1
COADS climatological simulation. The model was forced with COADS climatology from Da Silva (1994). The model domain is (28oS to 65oN), with 16 layers in the vertical. Results of this model are published in Chassignet and Garraffo, 2001, and Garraffo et al, 2003. Results on numerical drifters and floats deployed initially in a 1ox1o grid are published in Garraffo et al, 2001 a,b and Bracco et al, 2003.
Run 2
ECMWF climatological simulation. The model domain is the North and
Equatorial Atlantic (28oS to 70oN) including the Mediterranean Sea,
with 20 layers in the vertical. A Richardson number dependent diapycnal mixing,
plus entrainement parameterization as in Hallberg (2000) are introduced in
order to obtain the mixing of Mediterranean and Atlantic waters occurring east
of Gibraltar. The Gulf Stream mean position agrees very well with results from
altimetry. Meddies are generated in the Gulf of Cadiz. Numerical drifters and
floats were deployed on a 1x1 deg regular array, redeployed monthly, and on
high resolution transects in the western boundary currents.
Run 3
ECMWF daily forcing simulation. The previous simulation was
continued applying 6-hourly forcing from ECMWF,
for years 1979-1986. The model shows a
drift that is more apparent after 2 years.
Last Modified on October 1, 2003
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