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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 December 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 +1.4°C, except for the Niņo1+2 index (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 +2°C to +5°C above average (Fig. T17).

During December 2009, convection was suppressed across Indonesia and enhanced over the western and central equatorial Pacific (Figs. T25, T26 and E3). Equatorial low-level westerly and upper-level easterly wind anomalies (Figs. T20 and T21) were also consistent with El Niņo. Overall, the oceanic and atmospheric anomalies reflected a strong El Niņo.



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

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