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El Niño in a changing climate
Sang-Wook Yeh1, Jong-Seong Kug, Boris Dewitte
1Climate Change and Coastal Disaster Research Department, Korea Ocean Research and Development Institute, 426-744, Ansan, Korea. swyeh@kordi.re.kr
Nature
|September 26, 2009
Summary
Global warming may increase the frequency of central Pacific El Niño events. This shift, from eastern Pacific El Niño events, is projected to occur as the thermocline flattens in the equatorial Pacific.
Area of Science:
- Climatology
- Oceanography
- Climate Change Science
Background:
- El Niño events are key drivers of global climate variability.
- Recent decades show a rise in central Pacific El Niño (CP-El Niño) events, differing from canonical eastern Pacific El Niño (EP-El Niño).
Purpose of the Study:
- To investigate the projected changes in the ratio of CP-El Niño to EP-El Niño events under global warming scenarios.
- To understand how climate change may alter El Niño characteristics.
Main Methods:
- Analysis of Coupled Model Intercomparison Project phase 3 (CMIP3) multi-model data.
- Calculation of El Niño indices based on historical data.
- Comparison of projected CP-El Niño and EP-El Niño frequencies.
Main Results:
- Anthropogenic climate change is projected to increase the frequency of CP-El Niño relative to EP-El Niño.
- Selected climate models suggest a potential fivefold increase in the CP-El Niño/EP-El Niño occurrence ratio.
- This shift is linked to a projected flattening of the thermocline in the equatorial Pacific.
Conclusions:
- Future climate change is likely to favor the occurrence of central Pacific El Niño events over eastern Pacific El Niño events.
- Understanding these shifts is crucial for predicting future climate impacts and socioeconomic consequences.
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