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Pacific ENSO Update

4th Quarter, 2010 Vol. 16 No. 4


La Niña continued during September 2010 as reflected by the large expanse of below-average sea surface temperatures (SSTs) across most of the equatorial Pacific Ocean. All weekly Niño SST index values were between –1.3°C and –1.8°C at the end of the month. In addition, the subsurface heat content (average temperatures in the upper 300m of the ocean) remained below-average, reflecting a shallower-than-average thermocline in the central and eastern Pacific. Convection remained enhanced over Indonesia and suppressed over the western and central equatorial Pacific. This pattern was linked to a continuation of enhanced low-level easterly trade winds and anomalous upper-level westerly winds over the western and central equatorial Pacific. These oceanic and atmospheric anomalies reflect the ongoing La Niña.

Average SST Anomalies

Graphics from NOAA's U.S. Climate Prediction Center

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Page Last Modified: January 19 2011 21:02:49 GMT


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