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 CRBC
 represents
 variability in the
 Caribbean
 Sea. This variability
 is
 very similar in the three cases.