However the atmospheric heights are changed far far more substantially by top down solar effects and bottom up oceanic effects. (judithcurry.com)
The irregularity of the temperature changes within those main background trends can not have been anything to do with humanity and can adequately be catered for by varying oceanic effects on multidecadal time scales. (newclimatemodel.com)
So jet stream positioning and consequent changes in solar input to the oceans could swing the ENSO phenomenon in favour of dominant El Nino or dominant La Nina subject additionally to possible modulation from internal oceanic effects. (wattsupwiththat.com)