Changes in Average Annual Precipitation in Argentina’s Pampa Region and Their Possible Causes

• DOI: 10.3390/cli3010150
• Publication Date: 2015-01-20T17:36:22Z
• Authors: Silvia Pérez; Eduardo Sierra; Fernando Momo; Marcelo Massobrio
• Keywords: Hydrometeorology

Changes in annual rainfall five sub-regions of the Argentine Pampa Region (Rolling, Central, Mesopotamian, Flooding and Southern) were examined for period 1941 to 2010 using data from representative locations each sub-region. Dubious series adjusted by means a homogeneity test changes mean value evaluated hydrometeorological time segmentation method. In addition, an association was sought between shifts large-scale atmospheric pressure systems, as measured Atlantic Multidecadal Oscillation (AMO), Pacific Decadal (PDO) Southern Index (SOI). The results indicate that Western Pampas (Central are more vulnerable abrupt average than Eastern (Mesopotamian, Rolling Flooding). Their vulnerability is further increased their having lowest rainfall. AMO showed significant negative correlations with all sub-regions, while PDO SOI positive respectively Pampa. fact going through phases cycles tend reduce much helps explain lower recorded recent years. This has had impact on agriculture environment.