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Climate Diagnostics Bulletin
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  Tropical Highlights

  Table of Atmospheric Indices  (Table 1)

  Table of Oceanic Indices  (Table 2)

  Time Series

  Time-Longitude Sections

  Mean & Anomaly Fields

  Appendix 1: Outside Contributions

Tropical Highlights


The pattern of tropical sea surface temperature (SST) anomalies

Tropical Highlights – January 2012



Mature La Niña conditions continued during January 2012 as negative sea surface temperature anomalies persisted across the eastern and central equatorial Pacific Ocean (Fig. T18, Table T2). The latest monthly Niño indices were -1.1°C for the Niño 3.4 region and -0.8°C for the Niño 1+2 region (Table T2, Fig. T5). Consistent with these conditions, the oceanic thermocline (measured by the depth of the 20°C isotherm) remained shallower than average in the east-central equatorial Pacific (Figs. T15, T16), where corresponding sub-surface temperatures were 1-4°C below average (Fig. T17).

Also during January, the equatorial low-level easterly trade winds and upper-level westerly winds were stronger than average over the central and west-central equatorial Pacific (Table T1, Figs. T20, T21).  Convection remained suppressed in the western and central equatorial Pacific and enhanced over Indonesia (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies reflect a continuation of La Niña conditions.



For the latest status of the ENSO cycle see the ENSO Diagnostic Discussion at:

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Page Last Modified: February 2012
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