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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 - December 2016



Sea surface temperatures (SSTs) remained below-average over the central and eastern equatorial Pacific during December 2016 (Fig. T18, Table T2). The latest monthly Niņo indices were -0.4°C for the Niņo 3 region, -0.4°C for the Niņo 3.4 region, and +0.5°C for the Niņo 1+2 region (Table T2, Fig. T5). The depth of the oceanic thermocline (measured by the depth of the 20°C isotherm) remained below-average over the eastern equatorial Pacific (Figs. T15, T16), and the corresponding sub-surface temperatures were 1-2°C below average (Fig. T17).


Also during December, the lower-level winds were near-average across the central and eastern equatorial Pacific and enhanced over the western equatorial Pacific (Table T1, Fig. T20). Meanwhile, convection was suppressed over the central and eastern equatorial Pacific and enhanced across Indonesia and western equatorial Pacific (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies reflect a continuation of weak La Niņa conditions.


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

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