present the horizontal distributions of temperature, salinity, and nitrate
at 50 m for January, April and August 1998. The difference between these
fields and the corresponding average conditions reported by the National
Oceanographic Data Center (Antonov et al., 1998; Boyer et al., 1998;
Conkright et al., 1998) are also included. Monthly
averages for temperature and salinity were used but only a seasonal
average is available for nitrate. We have chosen 50 m depth as it
corresponds to the level of maximum temperature anomaly difference.
We have also included the geopotential thickness distributions of the
upper 500 dbar.