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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 1983–92 base period means.