Sea surface temperature (SST)
anomalies remained above average across much of the equatorial
during September 2009(Fig. T18).
of the Niņo-region SST indices were about +0.8°C throughout the month, except
for the Niņo1+2 index, which dropped to +0.3°C during September (Table
T2, Fig. T5). The
oceanic thermocline along the equator, measured by the depth of the 20°C
isotherm, remained deeper than average across the
(Figs. T15, T16).
Consistent with these conditions, temperatures were 1o-2oC
above average at thermocline depth across the equatorial Pacific (Fig. T17).
during September, convection was suppressed across
but enhanced over the
west-central Pacific (Figs. T25,
E3). In addition, westerly
wind bursts were observed over the western equatorial Pacific during the month (Figs. T13, T20).
This coupling of the oceanic and atmospheric anomalies indicates a continuation
of weak El Niņo conditions.
the latest status of the ENSO cycle see the ENSO Diagnostic Discussion at: