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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

MARCH 2018

The pattern of tropical sea surface temperature (SST) anomalies

Tropical Highlights - March 2018



Sea surface temperatures (SSTs) during March 2018 remained below-average across the east-central and eastern equatorial Pacific (Fig. T18, Table T2). The latest monthly Niņo indices were -0.1°C for the Niņo 4 region, -0.7°C for the Niņo 3.4 region, and -0.8°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) was above-average over the east-central equatorial Pacific and below-average over the far eastern equatorial Pacific (Figs. T15, T16), and the corresponding sub-surface temperatures were 1-2°C below average over the far eastern equatorial Pacific (Fig. T17).


Also during March, the lower-level wind anomalies were easterly across the eastern and east-central equatorial Pacific while the upper-level westerly winds were above-average over the eastern equatorial Pacific (Table T1, Figs. T20, T21). Meanwhile, convection was suppressed over the east-central equatorial Pacific and enhanced across Indonesia and the western equatorial Pacific (Figs. T25, E3). Collectively, these oceanic and atmospheric anomalies reflect weak La Niņa conditions.


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

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