Abstract

GONZALEZ, Marcela Hebe  and  FLORES, Olga Karina. Rainfall analysis in chaco plains and its relationship with atmospheric circulation behavior and sea surface temperatures. Meteorologica [online]. 2010, vol.35, n.2, pp.53-66. ISSN 1850-468X.

The aim of this study is to detect atmospheric signals related to the interannual variability of rainfall in the Chaco Plains. Mean rainfall series in regions defined, are correlated to sea surface temperature, 200, 500, and 1000Hpa geopotential height, sea level pressure, 925 Hpa specific humidity and 850Hpa wind fields in the simultaneous three month period and in the previous month. The increase of summer precipitation is associated to the weakening of the Atlantic High and high values of low level specific humidity in northeast Argentina. In the northeast region it is also associated with easterlies winds and weak northerly and the northwest region is influenced by La Nina. In spring, the principal feature is the relation with the warm phase of ENOS phenomenon. The most important feature is that summer rainfall in the three subregions, is associated with a weaken Atlantic High during the previous month meanwhile Spring rainfall is related to ENSO phenomenon.

Keywords : Rainfall; Chaco plains; Correlations; Atmospheric circulation variables; Sea Surface Temperatura.

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