Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3519703n&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 19, CiteID L19703
Physics
7
Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504)
Scientific paper
Trends in the seasonal and temporal behaviour of the El Niño-Southern Oscillation over the period 1958-2007 have been assessed using two indices of the phenomenon, NINO3.4 and a non-standardised Southern Oscillation Index (SOI). There is no evidence of trends in the variability or the persistence of the indices, nor in their seasonal patterns. There is a trend towards what might be considered more ``El Niño-like'' behaviour in the SOI (and more weakly in NINO3.4), but only through the period March-September and not in November-February, the season when El Niño and La Niña events typically peak. The trend in the SOI reflects only a trend in Darwin pressures, with no trend in Tahiti pressures. Apart from this trend, the temporal/seasonal nature of the El Niño-Southern Oscillation has been remarkably consistent through a period of strong global warming.
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