Abstract
Changes in annual rainfall in five sub-regions of the Argentine Pampa Region (Rolling, Central, Mesopotamian, Flooding and Southern) were examined for the period 1941 to 2010 using data from representative locations in each sub-region. Dubious series were adjusted by means of a homogeneity test and changes in mean value were evaluated using a hydrometeorological time series segmentation method. In addition, an association was sought between shifts in mean annual rainfall and changes in large-scale atmospheric pressure systems, as measured by the Atlantic Multidecadal Oscillation (AMO), the Pacific Decadal Oscillation (PDO) and the Southern Oscillation Index (SOI). The results indicate that the Western Pampas (Central and Southern) are more vulnerable to abrupt changes in average annual rainfall than the Eastern Pampas (Mesopotamian, Rolling and Flooding). Their vulnerability is further increased by their having the lowest average rainfall. The AMO showed significant negative correlations with all sub-regions, while the PDO and SOI showed significant positive and negative correlations respectively with the Central, Flooding and Southern Pampa. The fact that the PDO and AMO are going through the phases of their cycles that tend to reduce rainfall in much of the Pampas helps explain the lower rainfall recorded in the Western Pampas sub-regions in recent years. This has had a significant impact on agriculture and the environment.
Highlights
Knowledge of rainfall in an agro-ecosystem is critical for sustainable land management [1,2,3,4]
Pampa Region is Argentina’s main agricultural area. It is located in the east-central part of the country, covering the provinces of Entre Rios, Santa Fe, Córdoba, La Pampa and Buenos Aires
This study examines shifts in mean annual precipitation from 1941 to 2010, the period for which homogeneous instrumental records are available
Summary
Knowledge of rainfall in an agro-ecosystem is critical for sustainable land management [1,2,3,4]. The. Pampa Region is Argentina’s main agricultural area. Pampa Region is Argentina’s main agricultural area It is located in the east-central part of the country, covering the provinces of Entre Rios, Santa Fe, Córdoba, La Pampa and Buenos Aires (30°S to 40°S and 56°W to 65°W) [5,6]. The Pampa Region has a humid temperate climate, Cf in the Koppen-Geiger classification, as revised by [7]. Driven by a semi-permanent anticyclone from the coast of Brazil, predominate. After being drawn across the Brazilian coastline, maritime subtropical air heads southeast, reaching up to 40°
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