Resumo

KARLIN, Marcos S.. Temporal changes of the climate in Arid Chaco subregion. Multequina [online]. 2012, vol.21, n.1, pp.3-16. ISSN 1852-7329.

The current global climate conditions differ from the historical average data. In the Arid Chaco this trend is reflected in the advance of the agricultural frontier towards the east of the subregion, due partially to an increase in the precipitation. The aim of this paper is to analyze temporal changes of temperature and precipitation, and the ENSO influence over these variables. The historical series of the Arid Chaco climate were analyzed for six locations for the period 1931-2011. The results show positive trends in precipitation and average temperatures, although increasingly variable. Precipitations and temperature are inversely related, possibly as a result of the advance of cold fronts from the south, causing precipitation. Nevertheless, the linear regressions between both variables do not fit significantly (p< 0,05). Changes in the location of high and low pressure centers in the subregion explain another part of the variation in mean annual temperatures and precipitation. Many of the observed climate anomalies coincide with ENSO events, although the intensity of these events have little relation with the intensity of climate anomalies in the subregion.

Palavras-chave : Arid Chaco; Climatic variability; ENSO.

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