This plot displays time series of the three-month running average of standardized tropical tropospheric temperature anomalies (in blue) and the three-month running average of standardized Niño 3.4 sea surface temperature anomalies (in red).
The standardized tropospheric temperature anomalies are averaged around the globe from 25°S to 25°N and from the 850 hPa pressure level to 200 hPa. The climatological base period for the atmospheric temperature is 1981 to 2010, and the base period used for the sea surface temperature anomalies is 1971-2000.
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