Different types of El Niño and impact on Eurasian Climate

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• Prof Hans Graf, Department of Geography, University of Cambridge
• Thursday 02 February 2012, 16:15-17:30
• Pfizer Lecture Theatre, Department of Chemistry.

If you have a question about this talk, please contact Dr Alex Archibald.

El Niños are periods of warming of equatorial ocean surfaces in the Pacific. This lecture discusses variable teleconnections and possible effects of El Niño on North Atlantic/European regional climates. Two different types of El Niños (the Central Pacific, or CP, and the East Pacific, or EP) result in remarkably different European winter temperature anomalies, specifically weak warming during EP and significant cooling during CP El Niños. We propose a tropospheric bridge as the mechanism primarily responsible for the establishment of a negative NAO phase and of associated cold European winters. As global warming scenarios project an increase in the frequency of CP El Niño events, the distinctive nature of this mechanism implies that the probability of cold European winters may increase as well in future decades.

This talk is part of the Cambridge Centre for Climate Science series.

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