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Climate Diagnostics Bulletin
Climate Diagnostics Bulletin - Home Climate Diagnostics Bulletin - Forecast Climate Diagnostics Bulletin - Extratropics


  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


Forecast Forum

Sea surface temperature (SST) anomalies during November 2009 continued to increase across much of the central and eastern equatorial Pacific Ocean (Fig. T18).  Consequently, all of the monthly Niņo-region SST indices were above +1.3°C, except for the Niņo1+2 index, which increased to +0.5°C (Table T2, Fig. T5). The oceanic thermocline, measured by the depth of the 20°C isotherm, remained deeper than average across the equatorial Pacific (Figs. T15, T16), with sub-surface temperatures in the eastern Pacific reaching +4°C to +6°C above average (Fig. T17). Overall, the oceanic and atmospheric anomalies reflected a moderate strength El Niņo.

The tropical circulation during November also featured intra-seasonal activity associated with the Madden-Julian Oscillation (MJO) (Figs. T12), which masked the El Niņo-related pattern of enhanced convection over the central equatorial Pacific (Figs. T25 and E3). The MJO also contributed to the variations of the lower-level and upper-level wind anomalies over the equatorial Pacific (Figs. T20, T21 and T13).  



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

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