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Two
hybrid-coordinate K-T mixed layer models have been developed.
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K-T 1:
Full model
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This
version has a prognostic mixed layer base. At a given grid point,
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the
base is contained within layer k and divides this layer into two
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sublayers
(see diagram on previous slide). T and S are estimated
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within
these sublayers by “unmixing” each variable, then the TKE
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balance
is calculated as in the MICOM K-T mixed layer.
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K-T
2: Simplified model
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This
version was developed by Rainer Bleck to avoid unmixing and
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the
associated computational overhead. At each grid point, the mixed
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layer
base always resides on a vertical coordinate interface.
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When
HYCOM is run in MICOM mode, the MICOM 2.8 Kraus-Turner mixed
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layer
model is used. The mixed layer base coincides with vertical coordinate
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interface
2 (layer 1 is the slab mixed layer). Another major difference from the
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hybrid-coordinate
K-T models is the detrainment algorithm, since the density
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of
detrained water must match the isopycnic reference density of the layer
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accepting
the water.
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