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NLOM
is a primitive equation, hydrodynamic, layered ocean model which is a
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descendent
of that by Hurlburt and Thompson (1980) with substantial enhancements
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in
processing and capability from Wallcraft (1991).
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The
model has no-slip and kinematic boundary conditions and is solved on a
C-grid
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using
a semi-implicit (explicit) time scheme for finite depth (reduced gravity)
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simulations.
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Isopycnal
outcropping is allowed and occurs when diapycnal mixing is active and the
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layer
thickness is less than the thickness at which entrainment begins (here, 50
m).
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Non-positive
layer thickness is prevented through a hydromixing process which
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mixes
momentum and mass, but leaves density unchanged.
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The
model domain is from 20ºS-62ºN and 109ºE-77ºW, with a horizontal resolution
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of
1/16º in latitude and 45/512º in longitude, and utilizes a modified version
of the
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1/12º
ETOP05 (NOAA, 1986) for the side and bottom topographies. Extensive
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corrections
have been made to the Hawaiian Islands region to better represent the
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archipelago.
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The
maximum depth of the model is 6500 m and the model uses the 200 m isobath
as
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the
minimum depth as well as the shelf break.
In finite depth simulations, topography
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is
confined to the lowest layer, forcing the lowest layer flow to follow f/h
contours
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and
allowing the model to regulate baroclinic instability.
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Since
the model domain is closed, there is no Indonesian throughflow and no
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contribution
from the global thermohaline circulation.
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