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HOME > Expert Assessments > Climate Diagnostics Bulletin > Tropical Highlights

Tropical Highlights - July 2006


The pattern of tropical sea surface temperature (SST) anomalies in the Pacific during July 2006 featured slightly warmer than average temperature in the equatorial central and eastern Pacific (Fig. T18).  Accordingly, the SST anomaly in the Niņo 4 and Niņo 3.4 regions remained slightly positive (values of 0.5 and 0.3 respectively), while the SST anomaly in the Niņo 1+2 region became positive (latest value: +0.4) for the first time since March 2006 (Table T2). Meanwhile, the Tahiti – Darwin SOI is negative (latest value: -0.8) in response to higher than average pressure over Darwin (Table T1, Figs. T1, T19).

The oceanic thermocline, measured by the depth of the 20ēC isotherm along the equator, featured slightly above average depth across the equatorial Pacific during July (Figs. T15, T16).  Consistent with these conditions, equatorial oceanic temperatures at thermocline depth were 1-3ēC above average throughout most of the Pacific (Fig. T17).

During July, low-level winds were near-average throughout the equatorial Pacific and Indian Ocean , except that westerly anomalies (more than 3.0 m s-1) were observed over the eastern equatorial Pacific (Fig. T20).  Suppressed convection (below-average rainfall amounts) was observed across eastern Indian Ocean , over Indonesia and the central equatorial Pacific (Figs. T25, T26 and E3).


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