Wednesday, 26 March 2003: 11:30 AM
Rainfall anomalies in western South America and the traditional "El Niņo" versus "ENSO"
The traditional meaning of "El Niņo", or warming of the waters along the west coast of equatorial South America, has come to be associated with the global El Niņo/Southern Oscillation (ENSO) both in the popular literature and in some of the scientific literature. Because ENSO is related to global teleconnection patterns it commands worldwide interest and concern. However, the local "El Niņo remains of great local importance and concern. Notable recent examples are the heavy "El Niņo" rain in Ecuador and Peru early in 2001 and again in 2002 before the development of the basin-scale ENSO. In 1998, in contrast, the west coast of South America experienced heavy "El Niņo-like" spring rains
while a full-fledged cold episode was building in the central basin. This paper examines the relationship between excess rainfall along the west coast of South America in the context of prediction and predictability of "local SSTs and rainfall" versus the prediction and predictability of basin-scale ENSO events.
Supplementary URL: