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Advances in Meteorology
Volume 2012 (2012), Article ID 359164, 13 pages
Research Article

Some Factors That Influence Seasonal Precipitation in Argentinean Chaco

1Department of Atmospheric and Oceanic Science, FCEN, University of Buenos Aires, Buenos Aires, 2 piso, Pabellón II, Ciudad Universitaria, 1428 Buenos Aires, Argentina
2Research Center of Ocean and Atmosphere, CONICET/UBA and UMI-IFAECI/CNRS, 2 piso, Pabellón II, Ciudad Universitaria, 1428 Buenos Aires, Argentina
3National Meteorological Service of Argentina, 25 de Mayo 658, Buenos Aires, Argentina

Received 28 March 2012; Revised 6 July 2012; Accepted 24 July 2012

Academic Editor: Soon-Il An

Copyright © 2012 Marcela Hebe González et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.