of global tropical sea surface temperature (SST) anomalies during February
featured negative anomalies in the east-central equatorial Pacific, with SST
anomalies of -0.6 in the Niņo 3.4 and Niņo 4 regions (Fig. T18,
Table T2). Meanwhile, the SST anomalies in the
Niņo 1+2 region became positive for the first time since June 2005 (Fig.
T18, Table T2). The
- Darwin SOI (latest value -0.2, Table T1, Fig.
T1) was slightly negative, in response to
higher-than-average pressure over
. The latter is consistent with suppressed convection during February over
the western tropical Pacific, including northern
thermocline, measured by the depth of the 20°C
isotherm along the equator, featured deeper-than-average depth in the
western-central Pacific and shallower-than-average depth in the eastern
Pacific during February (Figs. T15, T16).
Consistent with these conditions, equatorial oceanic temperatures at
thermocline depth were 2-3oC above average across the
western-central equatorial Pacific and 2-5oC below average across
the eastern equatorial Pacific (Fig. T17).
February, 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 vicinity of SPCZ and across the eastern tropical
T26 and E3).