The present work provides a realistic description of the patterns of the precipitation spatial distribution over a region of the planet where the ENSO’s impact is particularly noticeable, and the nets of observation present lacks so much in the heterogeneous spatial distribution as in the unequal length of the records.
Thereby, previous analysis was carried out again, based on scarce punctual data, and a methodology in order to define a homogeneously distributed virtual net with equal sized records is provided, on the basis of all the stations of the region under study (more than 250).
The work is focused over the Uruguay River basin, in the SSA, where an analysis of the precipitation patterns and of the possible influences of the ENSO phenomenon over a transition region between the subtropical regimes and the mean latitude ones was carried out.
Many relationships among the warm, cool an neutral phases of the ENSO and the maxima of precipitation were found. The conclusions of this work enhance the knowledge of the climatic characteristics of the Uruguay River basin and also the possibilities of a confident climatic prediction.
The occurrence of warm events on the East of the Equatorial Pacific is, as it was expected, related with the maximum values of precipitation. A significant difference between the precipitation during the warm and cool ENSO events exists towards the end of the spring (November-December) and during the winter (July-August). The maximum monthly precipitation is related with the ENSO warm phase.
A relationship between cool events on the Equatorial Pacific and the monthly minimum precipitation also exists, but the intensity (strength) of the relationships is weakker than the one on the warm phase. On the other hand, there are not significant differences between the precipitation during the warm and neutral phases, although the minimum monthly precipitation generally occurs during the cool event.