Variability in the El Niño-Southern Oscillation through a glacial-interglacial cycle
Tudhope, Alexander W., Colin P., Chilcott, McCulloch, Malcolm T., Cook, Edward R., Chappell, John, Ellam, Robert M., Lea, David W., Lough, Janice M., and Graham B., Shimmield (2001) Variability in the El Niño-Southern Oscillation through a glacial-interglacial cycle. Science, 291 (5508). pp. 1511-1517.
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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.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||El Niño Southern Oscillation, ENSO, climate, interannual variability, temperature, solar forcing, glacial-interglacial cycles, coral bands, Porites|
|Date Deposited:||01 Jun 2007|
|FoR Codes:||04 EARTH SCIENCES > 0405 Oceanography > 040501 Biological Oceanography @ 0%
04 EARTH SCIENCES @ 0%