The trajectories released to the north of the GS
recirculate in a large anticyclone at the Gulf Stream separation point and then
enter a zonal meandering eastward flow that turns northeastward unrealistically
too far to the east. The AC is not clearly discernable and no trajectories
re-enter the GS as part of the Sargasso Sea recirculation. This is partly due
to the unrealistic eastward flow around 26° to 28°N that captures
many of the simulated drifters; no equivalent feature is seen in the drifter
observations. A small convergence zone in the southeastern sector of the basin
is found in roughly the same location as in the 0.1° model. The northern currents are in better
qualitative agreement with the observations. Trajectories initiated south and
east of Iceland enter the NwAtC via the Iceland-Faroe Ridge, while those
initiated to the west either enter the WGC and
continue into the EGC or move northeastward around Iceland. In the LS,
those initiated in the southern part of the sea flow southward in the Labrador
Current. They either flow unrealistically far south until they meet with GS or
turn eastward to flow across the basin.
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