El-Nino, La-Nina, Southern Oscillation, ENSO El-Nino, La-Nina, Southern Oscillation, ENSO El-Nino, La-Nina, Southern Oscillation, ENSO El-Nino, La-Nina, Southern Oscillation, ENSO El-Nino, La-Nina, Southern Oscillation, ENSO El-Nino, La-Nina, Southern Oscillation, ENSO El-Nino, La-Nina, Southern Oscillation, ENSO El-Nino, La-Nina, Southern Oscillation, ENSO http://biophysics.sbg.ac.at/atmo/elnino.htm El-Nino, La-Nina, Southern Oscillation, ENSO 1925, 1953, 1972, 1982, 1986, 1992, 1993, and 1997