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Secular trend in the near‐surface currents of the equatorial Pacific Ocean

The westward zonal near‐surface currents of the equatorial Pacific Ocean appear to have strengthened during the past 20 years by 9–10 cm/s. Here we document this change in both near‐surface drifter and moored currents. Accompanying this increase in surface currents is a shallowing of the equatorial thermocline and a weakening of the zonal component of the equatorial trade winds. However, a simple model suggests that the most important factor is a reduction by 8 m of the average mixed layer depth over this period.