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El Niño and its relationship to changing background conditions in the tropical Pacific Ocean
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El Niño and its relationship to changing background conditions in the tropical Pacific Ocean
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Journal Article
El Niño and its relationship to changing background conditions in the tropical Pacific Ocean
2011
Overview
This paper addresses the question of whether the increased occurrence of central Pacific (CP) versus Eastern Pacific (EP) El Niños is consistent with greenhouse gas forced changes in the background state of the tropical Pacific as inferred from global climate change models. Our analysis uses high‐quality satellite and in situ ocean data combined with wind data from atmospheric reanalyses for the past 31 years (1980–2010). We find changes in background conditions that are opposite to those expected from greenhouse gas forcing in climate models and opposite to what is expected if changes in the background state are mediating more frequent occurrences of CP El Niños. A plausible interpretation of these results is that the character of El Niño over the past 31 years has varied naturally and that these variations projected onto changes in the background state because of the asymmetric spatial structures of CP and EP El Niños. Key Points The character of El Nino is changing in ways not expected from climate models Changes in El Nino are projecting onto background conditions The changes probably result from natural variations rather than GHG forcing
Publisher
Blackwell Publishing Ltd,American Geophysical Union,John Wiley & Sons, Inc
Subject
