Highlights - July 2007
Tropical sea surface temperatures (SSTs) during July 2007 were near-average across the western and central equatorial Pacific and colder-than-average over the eastern tropical Pacific
(Fig. T18). This pattern is reflected in negative values of the Niņo 1+2 (-1.6), Niņo 3 (-0.8), and Niņo 3.4 (-0.3) region SST indices
(Table T2). Meanwhile, the Tahiti Darwin SOI was slightly negative (latest value: -0.5) in response to higher than average pressure over Darwin
(Table T1, Figs. T1). These conditions indicate a continuation of ENSO-neutral conditions.
The equatorial oceanic thermocline during July, measured by the depth of the 20ēC isotherm, featured a continuation of below-average depths over the eastern equatorial Pacific and near-average depths across the western and central equatorial Pacific (Figs.
T15, T16). As a result, temperatures in the eastern equatorial Pacific remained generally 1-2ēC below average at thermocline depth
During July 2007, low-level easterly anomalies (more than 3.0 m s-1) were observed over the central equatorial Pacific
(Fig. T20). This anomaly pattern has persisted since February
(Fig. T13), and is consistent with the shallower-than-average thermocline and cooler SSTs farther east. This wind pattern was also associated with enhanced convection (above-average rainfall amounts) across Indonesia, and a continuation of suppressed convection (below-average rainfall amounts) across the central and eastern equatorial Pacific (Figs.
For the latest status of the ENSO cycle see the ENSO Diagnostic Discussion at: