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HOME > Expert Assessments > Climate Diagnostics Bulletin > Tropical Highlights

Tropical Highlights - September 2005



The overall patterns of convection, SSTs, low-level winds and upper-level winds remained near average over the central and eastern tropical Pacific during September 2005 (Figs. T18, T20, T21 and T25), which is consistent with ENSO-neutral conditions.  The pattern of global tropical sea surface temperature (SST) during September featured near-average SSTs everywhere, except  slightly negative anomalies in the eastern tropical Pacific and positive anomalies in the tropical North Atlantic. The warmth in the tropical North Atlantic has been a persistent feature during the last several months (Fig. T18, Table T2).

The oceanic thermocline, measured by the depth of the 20C isotherm along the equator, featured near-average depth in the central Pacific and slightly shallower-than-average depth in the eastern Pacific (Figs. T15, T16). Consistent with these conditions, equatorial oceanic temperatures at thermocline depth were near average throughout most of the Pacific and 1-2 oC below average in the eastern Pacific (Fig. T17). The Tahiti - Darwin SOI (Table T1, Fig. T1) and equatorial SOI were near zero in September.

During September, negative OLR anomalies (above-average rainfall amounts) were observed over India, the Arabian Sea and Bay of Bengal, and over the western tropical Pacific, while positive anomalies (below-average rainfall amounts) were observed over the equatorial Indian Ocean and northwestern South America (Fig. T25, Fig. E3).


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