Highlights - January 2015
January 2015, sea surface temperatures (SSTs) remained above-average across the
western and central equatorial Pacific, and became below average in the eastern
equatorial Pacific (Fig. T18, Table T2). The
latest monthly Niņo indices were +0.9°C for the Niņo 4 region, +0.5°C for the
Niņo 3.4 region, and -0.4°C for the Niņo 1+2 region (Table T2, Fig. T5).
The overall depth of the oceanic thermocline (measured by the depth of the 20°C
isotherm) was near-average across the equatorial Pacific (Figs. T15, T16). However,
an extensive area of positive subsurface anomalies persisted near the Date
Line, while negative anomalies were prevalent closer to the surface east of
110°W (Fig. T17).
during January, the low-level easterly trade winds remained near-average across
much of the equatorial Pacific (Table T1, Fig. T20).
Meanwhile, tropical convection remained enhanced across Indonesia and western
equatorial Pacific, and suppressed near the Date Line (Figs. T25, E3). Collectively, these oceanic and
atmospheric anomalies reflect a continuation of ENSO-neutral conditions.
latest status of the ENSO cycle see the ENSO Diagnostic Discussion at: