One
 annual cycle of upper ocean
 variability
 is illustrated by
 imaging
 the temperature field
 and
 superimposing the vertical
 coordinate
 interfaces and the
 mixed
 layer base (thick line).
 
 The
 annual cycle at point SARG
 represents
 variability in the
 interior
 western subtropical gyre.
 All
 three simulated fields are
 very
 similar.