Variability in the El Niño-Southern Oscillation Through a Glacial-Interglacial Cycle
Top Cited Papers
- 23 February 2001
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 291 (5508), 1511-1517
- https://doi.org/10.1126/science.1057969
Abstract
The El Niño–Southern Oscillation (ENSO) is the most potent source of interannual climate variability. Uncertainty surrounding the impact of greenhouse warming on ENSO strength and frequency has stimulated efforts to develop a better understanding of the sensitivity of ENSO to climate change. Here we use annually banded corals from Papua New Guinea to show that ENSO has existed for the past 130,000 years, operating even during “glacial” times of substantially reduced regional and global temperature and changed solar forcing. However, we also find that during the 20th century ENSO has been strong compared with ENSO of previous cool (glacial) and warm (interglacial) times. The observed pattern of change in amplitude may be due to the combined effects of ENSO dampening during cool glacial conditions and ENSO forcing by precessional orbital variations.Keywords
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