Precipitation Extremes and Trends over the Uruguay River Basin in Southern South America

• Published in: Climate (Basel) Vol. 12; no. 6; p. 77
• Main Authors: Ferreira, Vanessa, Bonfim, Osmar Toledo, Maroneze, Rafael, Mortarini, Luca, Valdes, Roilan Hernandez, Costa, Felipe Denardin
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.06.2024
• Subjects: Daily rainfall; Datasets; Environmental aspects; Environmental hazards; extreme precipitation; Extreme weather; Floods; Heavy precipitation; Heavy rainfall; Hydrology; Livestock; Precipitation; Precipitation (Meteorology); precipitation trends; Rainfall; Regions; Regression analysis; Rice; River basins; Rivers; southern South America; Spatial distribution; Storm damage; Trends; Uruguay; Uruguay river basin; Watersheds; Wet days; Uruguay; South America; Brazil; Rio Grande do Sul Brazil; Argentina; La Plata River
• ISSN: 2225-1154; 2225-1154
• DOI: 10.3390/cli12060077

This study analyzes the spatial distribution and trends in five extreme daily rainfall indices in the Uruguay River Basin (URB) from 1993 to 2022 using the Climate Hazards Group Infrared Precipitation with Stations (CHIRPS) dataset. The main findings reveal a predominantly positive trend in heavy precipitation (R95p) and extreme precipitation (R99p) events over the mid URB, while a negative trend is observed in the upper and low URB. Significant trends in the frequency of heavy and extreme rainfall were observed during autumn (MAM), with positive trends across most of the mid and upper URB and negative trends in the low URB. In the upper URB, negative trends in the frequency of extremes were also found during spring (SON) and summer (DJF). Overall, there was a reduction in the number of consecutive wet days (CWD), particularly significant in the upper URB and the northern half of the mid URB. Additionally, the upper URB experienced an overall increase in the duration of consecutive dry days (CDD).