"The warmer conditions have been linked to higher concentrations of
atmospheric greenhouse gases".
"Global temperature anomalies during the ten strongest El Niños of the
Twentieth Century are shown above. The width of the bar represents the
character of the event. El Niño events have a duration varying between
half a year to a year and a half. Over recent years, El Niño events
have become more frequent as the global temperature anomalies
associated with each El Niño continue to increase. This means that the
extreme regional weather and climate anomalies associated with El Niño
are being exacerbated by increasingly higher temperatures. The warmer
conditions have been linked to higher concentrations of atmospheric
National Oceanic and Atmospheric Administration
The Top 10 El Niño Events of the 20th Century
Climate Perspectives Branch, Global Climate Lab
National Climatic Data Center, Asheville, NC
June 4, 1998
El Niño events were based on work described in: Livezey et al., 1997:
Teleconnective response of the Pacific-North American region
atmosphere to large central equatorial Pacific SST anomalies, J.
Climate, 10, 1787-1819.