INTERACTION PROCESSES BETWEEN THE ANNUAL WAVE AND THE DISTURBANCES INSERIES OF DAILY TEMPERATURE

Recently daily series of meteorological variables have been studied ac cording to signal-noise patterns by different authors. Later on, the p ersistence phenomenon was modeled as an autoregressive structure of Ma rkovian red noise. Ln series of daily anomalies obtained from filtered annual wave, a particular memory remains that is seasonally dependent . The method presented in this paper allows the modeling of (a) season al and intraseasonal variation of persistence, and (b) temporal distan t action between perturbations. Data are showing that temporal distant action between perturbations would result from slow changes in border conditions, Such as ENSO. Four examples of previous changes in the st ructure of daily extreme temperature series of San Miguel de Tucuman, Argentina, known as ''season structure,'' are shown. One of them corre sponds to the Fl Nino/no Fl Nino dichotomic phenomenon.