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