Some Factors That Influence Seasonal Precipitation in Argentinean Chaco

Abstract EN

The Chaco plain region in Argentina is located in the north of the country and east of Los Andes where the main activity is the agriculture.

As such activity is highly affected by interannual rainfall variability, the influence of some of the principal atmospheric and oceanic forcing is investigated in this paper.

Results show that the factors which affect precipitation highly depend on the season and the subregion.

The position of the South Atlantic Height and the sea surface temperature in the coast of southern Brazil and Buenos Aires seem to be the factors that affect rainfall, all over the year.

The El Niño-Southern Oscillation phenomenon affects summer and spring rainfall and the Southern Annular Mode involves spring precipitation but both only in the east of the study region.

Furthermore, enhanced convection in Central Brazil, mainly influences autumn and spring rainfall.