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Following reconstructions suggesting weakened temperature gradients along theEquator in the early Pliocene, there has been much speculation about Plioceneclimate variability. A major advance for our knowledge about the laterPliocene has been the coordination of modelling efforts through the PlioceneModel Intercomparison Project (PlioMIP). Here the changes in interannualmodes of sea surface temperature variability will be presented acrossPlioMIP. Previously, model ensembles have shown little consensus in theresponse of the El Niño–Southern Oscillation (ENSO) to imposed forcings– either for the past or future. The PlioMIP ensemble, however, showssurprising agreement, with eight models simulating reduced variability andonly one model indicating no change. The Pliocene's robustly weaker ENSO alsosaw a shift to lower frequencies. Model ensembles focussed on a wide varietyof forcing scenarios have not yet shown this level of coherency. Nonetheless,the PlioMIP ensemble does not show a robust response of either ENSO flavouror sea surface temperature variability in the tropical Indian and NorthPacific oceans. Existing suggestions linking ENSO properties to to changes inzonal temperature gradient, seasonal cycle and the elevation of the AndesMountains are investigated, yet prove insufficient to explain the consistentresponse. The reason for this surprisingly coherent signal warrants furtherinvestigation

Interannual climate variability seen in the Pliocene Model Intercomparison Project