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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 - October 2023


During October 2023, sea surface temperatures (SSTs) remained well above-average across the central and eastern equatorial Pacific (Fig. T18). The latest monthly Niņo indices were +2.5C for the Niņo 1+2 region, +1.6C for the Niņo 3.4 region and +2.0C for the Niņo 3 region (Table T2). The depth of the oceanic thermocline (measured by the depth of the 20C isotherm) was above-average across the central and eastern equatorial Pacific (Figs. T15, T16). The corresponding sub-surface temperatures were 1-5C above-average in the far eastern equatorial Pacific (Fig. T17).


Also during October, the lower-level wind anomalies were westerly over much of the equatorial Pacific, while the upper-level wind anomalies were easterly over the western and central equatorial Pacific (Table T1, Figs. T20, T21). Meanwhile, tropical convection was enhanced across the central and eastern equatorial Pacific and suppressed over Indonesia (Fig. T25). Collectively, these oceanic and atmospheric anomalies were consistent with strong El Niņo conditions.


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

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