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Internal noise.

  The cause for irregularity of ENSO has been attributed to noise internal to the atmosphere or ocean. Specifically, investigators have discussed the impact of the atmospheric weather, ranging in timescales from synoptic to interannual. Explicitly or implicitly, weather is invoked in the studies of Suarez and Schopf [1988], Zebiak [1989], Goswami and Shukla [1991], and Penland and Margorian [1993].

U.S. National Report to IUGG, 1991-1994
Rev. Geophys. Vol. 33 Suppl., © 1995 American Geophysical Union