Journal
SCIENCE
Volume 309, Issue 5735, Pages 758-761Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1112596
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During the warm early Pliocene (similar to 4.5 to 3.0 million years ago), the most recent interval with a climate warmer than today, the eastern Pacific thermocline was deep and the average west-to-east sea surface temperature difference across the equatorial Pacific was only 1.5 +/- 0.9 degrees C, much like it is during a modern El Nino event. Thus, the modern strong sea surface temperature gradient across the equatorial Pacific is not a stable and permanent feature. Sustained El Nino-like conditions, including relatively weak zonal atmospheric (Walker) circulation, could be a consequence of, and play an important role in determining, global warmth.
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