FIG. 18. Equatorial depth-longitude section of ocean temperature anomalies for (a) DJF
1998/99, (b) MAM 1999, (c) JJA 1999, and (d) SON 1999. Contour interval is 1°C. The dark
line is the 20°C isotherm. Data are derived from an analysis system that assimilates
oceanic observations into an oceanic GCM (Behringer et al. 1998). Anomalies are departures
from the 198392 base period means.