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Vertical
Coordinates
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Hybrid
coordinates
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Nearsurface:
z-coordinates
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Shallow
water: sigma (terrain-following) coordinates
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Coordinates
are isopycnic in the bulk of the ocean interior
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Isopycnic
coordinates (MICOM mode)
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Hybrid
Vertical Coordinate Scheme (part 1)
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In
the open ocean, the coordinates are isopycnic except year the surface
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where
minimum coordinate separation is enforced. The minimum
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separation
differs for each layer, giving the user great flexibility to set the
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vertical
coordinate structure in the z-coordinate domain.
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A
cushion function described in Bleck and Benjamin (1993) provides a
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smooth
transition between the isopycnic and z-coordinate domains.
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To
activate the sigma coordinate domain, the user specifies the number of
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sigma
coordinates n and the coordinate separation d. Vertical coordinates
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become
terrain-following where bottom depth is less than n*d. In
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extremely
shallow water, the coordinates revert to level coordinates.
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