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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

JULY 2012

The pattern of tropical sea surface temperature (SST) anomalies

Tropical Highlights – July 2012



 ENSO-neutral conditions continued during July 2012. The sea surface temperature (SST) anomalies continued to increase across the central and east-central equatorial Pacific, and SSTs in the eastern equatorial Pacific remained warmer-than-average during the month (Fig. T18, Table T2). The latest monthly Niño indices were +0.6°C for the Niño 3.4 region and +1.2°C for the Niño 1+2 region (Table T2, Fig. T5). Consistent with these conditions, the depth of the oceanic thermocline (measured by the depth of the 20°C isotherm) remained near-average in the east-central equatorial Pacific and above-average in the eastern equatorial Pacific (Figs. T15, T16).

However, the equatorial low-level easterly trade winds remained slightly enhanced over the west-central equatorial Pacific and slightly weaker than average across the east-central equatorial Pacific (Table T1, Fig. T20). This pattern does not reflect a clear atmospheric response to the positive SST anomalies. Enhanced convection was seen across Indonesia and western equatorial Pacific (Figs. T25, E3), which is further indication that the atmospheric circulation is not yet reflecting El Niño. Collectively, these oceanic and atmospheric anomalies reflect ENSO-neutral conditions.



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

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Page Last Modified: July 2012
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