Is El Nino changing?

@article{Fedorov2000IsEN,
  title={Is El Nino changing?},
  author={Fedorov and Philander},
  journal={Science},
  year={2000},
  volume={288 5473},
  pages={
          1997-2002
        }
}
Recent advances in observational and theoretical studies of El Nino have shed light on controversies concerning the possible effect of global warming on this phenomenon over the past few decades and in the future. El Nino is now understood to be one phase of a natural mode of oscillation-La Nina is the complementary phase-that results from unstable interactions between the tropical Pacific Ocean and the atmosphere. Random disturbances maintain this neutrally stable mode, whose properties depend… 
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