In
 this and the seven subsequent
 slides,
 five annual cycles of upper
 ocean
 variability are illustrated by
 imaging
 the temperature field
 and
 superimposing the vertical
 coordinate
 interfaces and the
 mixed
 layer base (thick line).
 
 At
 the ESTG grid point,
 variability
 within the interior
 eastern
 subtropical gyre does not
 display
 long-term climate drift.