•Hybrid Vertical
Coordinate Scheme (part 2)
–In the deep ocean, the isopycnic-level coordinate transition is performed
as follows:
•If the density of a
given layer does not equal the isopycnic reference density, the interfaces bounding the layer are adjusted
to return the density to its reference
value
–If the layer is too
light, the interface below is moved downward so that the entrained denser water returns the density
to its reference value
–If the layer is too dense, the interface above is moved upward in the same manner
•If minimum coordinate
separation is violated near the ocean surface, the cushion function is used to re-calculate the
vertical coordinate location, prohibiting
the restoration of isopycnic conditions.
•Two of the thermodynamical variables T, S, and density are mixed across the moving interfaces (user selectable), with the
third calculated from the equation of
state. If T and S are mixed, exact isopycnal
density is not restored, but repeated application keeps the error small.