Seasonal patterns of monthly rainfall and its applications with particular situation

PENALBA O, VARGAS W

Congreso; 5th International Meeting on Statistical Climatology; 1992

Tbis paper examines temporal and spatial annual variability ofprecipitation for 10 stations in the central- east of Argentina, and its relationship with special situation as the El Niño events and maximum apd minimum ofprecipitation. Specirel analysis ofmonthly series ofrainfall is suggested as a method cd regionel classification of rainfall regimes. By mapping the varíance sssocieied with speciñc rainfall oscillations, it is shown that the ñrst two harmonics are the most important contributors to tbe rainfall climatology. The different annual marches of rainfall are represented by the wave that contributes most to the total verieace .. The annual and semiannual cycles are more frequently in continental stations and in coast stations, it is more jmportant short-period fluctuations. The probability that every station has the same bermonic is studied. Only one yeer out of 60 has this characteristic and is associated with El Niño. The ennuel cycle, for the driest years, tends to be dominant over the whole region and the spatial distribution of the predominant fluctuation for the wettest years shows distinctive regional groupings. The El Niño events ietid to be essocieted with ibe wettest years