of global tropical sea surface temperature (SST) during April 2006 featured
negative anomalies in the eastern equatorial Pacific and near-average SSTs
elsewhere (Fig. T18, Table T2).
The SST anomaly in the Niņo 1+2
region is -1.2 (Table T2). Meanwhile, the
- Darwin SOI (latest value 0.9, Table T1, Fig. T1)
was still positive, in response to lower-than-average pressure over
The latter is consistent with enhanced convection over the western tropical
Pacific, including northern
during April (Fig. T25).
thermocline, measured by the depth of the 20°C
isotherm along the equator, featured slightly deeper-than-average depth
across the central and east-central Pacific and shallower-than-average depth
in the eastern Pacific during April (Figs. T15,
T16). Consistent with these conditions,
equatorial oceanic temperatures at thermocline depth were 1-2oC
above average across the central and east-central equatorial Pacific and 2-4oC
below average in the eastern equatorial Pacific (Fig. T17).
April, low-level easterly anomalies (more than 3.0 m s-1) were
observed over the central equatorial Pacific and westerly anomalies were
(Fig. T20). Enhanced convection
(above-average rainfall amounts) was observed over
T26 and E3).