Spatiotemporal variability of monthly precipitation concentration in Argentina

LLANO, MARÍA PAULA

Journal of southern hemisphere earth systems science

CSIRO

Año: 2023

The studies of the spatial and temporal variability of the precipitation concentration are necessary. Its variability is a significant climate element and also a critical socioeconomic factor. This study aims to contribute to the knowledge of rainfall in Argentina. Records of monthly precipitation for 64 stations are used (period 1991-2021) to calculate the monthly precipitation concentration index (PCI).Precipitation in Argentina, given its vast territory, presents a great variability with a wide range of rainfall regimes; PCI values are found between 10.6 and 27.3. These values are categorized as distribution is uniform (less than 10) and strong irregularity of precipitation distribution (greater than 20). The northwest of the country shows a high concentration. In the south, the precipitation concentration is low.Analysing the trends, the majority of the stations show positive trends in PCI (although not significant), this increase in the concentration of precipitation could become a risk depending on the evolution of the associated rain.