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Global trends and ENSO

Posted on July 04, 2008

It's long been known that El Ni o variability affects the global mean temperature anomalies. 1998 was so warm in part because of the big El Ni o event over the winter of 1997-1998 which directly warmed a large part of the Pacific, and indirectly warmed (via the large increase in water vapour) an even larger region. The opposite effect was seen with the La Ni a event this last winter. Since the variability associated with these events is large compared to expected global warming trends over a short number of years, the underlying trends might be more clearly seen if the El Ni o events (more...

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global warming