Cross-sections
 of sigma-0 along
 33W
 to a depth of 500m for summer
 (top)
 and to 3000m for winter
 (bottom).
 The thick line is the mixed
 layer
 base.
 
 Winter
 and summer fields simulated
 by
 HYCOM run with the two hybrid
 K-T
 mixed layer models (both with
 implicit
 diapycnal diffusion) differ
 substantially,
 with the K-T 1
 simulations
 more-closely resembling
 the
 observations (see next slide).