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Southern Oscillation is known to influence global surface temperatures, with El Ni帽o conditions leading to warmer temperatures and La Ni帽a conditions leading to colder temperatures. However, a new study in Geophysical Research Letters shows that some types of El Ni帽o do not have this effect, a finding that could explain recent decade-scale slowdowns in global warming.

The authors examine three historical temperature data sets and classify past El Ni帽o events as traditional or central Pacific. They find that global surface temperatures were anomalously warm during traditional El Ni帽o events but not during the central Pacific El Ni帽o events.

They note that in the past few decades, the frequencies of the two types of El Ni帽o events have changed, with the central Pacific type occurring more often than it had in the past, and suggest that this could explain recent decade-scale slowdowns in global warming.