of global tropical sea surface temperature (SST) during January featured negative
anomalies in the east-central equatorial
Pacific, with January values of -0.9 in the Niņo 3.4 region and -0.4 in the
Niņo 4 region (Fig. T18, Table T2).
Meanwhile, the SST anomalies in the eastern tropical Pacific increased
slightly, with the latest value of -0.3 in the Niņo 1+2 region (Fig. T18,
Table T2). The
- Darwin SOI (latest value 1.8, Table T1, Fig. T1)
was positive, in response to higher-than-average pressure over
and lower-than-average pressure over
. The latter is consistent with enhanced convection over the western
tropical Pacific, including northern
thermocline, measured by the depth of the 20°C
isotherm along the equator, featured near-average depth in the central
Pacific and slightly shallower-than-average depth in the eastern Pacific
during January (Figs. T15, T16).
Consistent with these conditions, equatorial oceanic temperatures at
thermocline depth were 2-4oC below average across the eastern
equatorial Pacific (Fig. T17).
January, near-average low-level winds were observed over the eastern
equatorial Pacific while low-level easterly anomalies (more than 3.0 m s-1)
were observed over the central equatorial Pacific (Fig. T20).
In the global tropics, enhanced convection (above-average rainfall amounts)
was observed over the western tropical Pacific and across the tropical
T26 and E3).