KPP
KPP (Relax. BC)
KPP (theta-S)
K-T Implicit
MICOM Mode
K-T Explicit
The
summer (Aug. 15) meridional
overturning
circulation is graphed for
six
HYCOM simulations as a function
of
latitude and density. The five
simulations
without relaxation BC’s
are
very similar to each other.
Relaxation
BC’s clearly enhance the
meridional
overturning circulation and
induces
a deep circulation cell
associated
with the northward flow
of
bottom water. A significant seasonal
cycle
exists at low latitudes, with a
reverse
circulation cell evident
south
of 10N in all simulations with no
relaxation
BC’s. This leads to
significant
upwelling at upper and
middle
depths near 10N. The tendency
for
flow reversal is evident in the BC
case,
but it does not overcome the
enhanced
overturning cell. The
upwelling
at 10N is confined to the
upper
ocean.