Predicting and observing el nino.

摘要: In October 1974 the occurrence of a weak El Nino event was predicted for early 1975 on basis southern oscillation index. An expedition organized to observe in waters off Peru and Ecuador during two cruises order study its development with time. During first cruise massive transgression warm low salinity water across equator 4 degrees S observed, as well depression thermocline along coast South America, indicating start development. second oceanographic situation had changed conditions were returning normal.