SACCI-CMIP6: South American Climate Change Impacts on floods and droughts

SACCI-CMIP6 dataset (South American Climate Change Impacts) provides projections of climate change impacts over South American hydrology, including topics related to (i) water balance, (ii) floods and extreme precipitation, (iii) flooded area and wetlands, (iv) droughts, and (v) low flows. Results are based on hydrological modeling using MGB-SA continental model (Siqueira et al., 2018) with hydroclimatic inputs of downscaled CMIP6 runs (Thrasher et al., 2022). MGB-SA provides daily outputs (river discharge and level, evapotranspiration, flood extent and total water storage) over more than 30 thousand catchments and river reaches (~15 km length and > 1,000 km² drainage area), which were post processed to generate the present database. This dataset was developed by the Institute of Hydraulic Research (IPH) from UFRGS in colaboration with the Brazilian Water Agency (ANA). It is described in a scientific report on Climate change impacts on floods and droughts in South America (Paiva et al., 2024) and in scientific papers (e.g. Petry et al. 2025, for analyses on floods and extreme precipitation). Dataset documentation is currently available only in portuguese. Additional information regarding methodology and results can be seen below in Published works. Published works Scientific Report on climate change impacts on floods and droughts in South America Paiva, R. C. D., Collischonn, W., Miranda, P. T., Fagundes, H.O., W., Kolling, A., Castro, L., Rossi, J., Matte, G., Laipelt, L., Alves. W, Petry. I (2024). Cooperação em tecnologias para análises hidrológicas em escala nacional. CLIMA: Impactos de Mudanças Climáticas em Extremos de Vazão (Cheias e Estiagens) – Relatório Final. IPH-ANA-HGE-CLIMA-A3. UFRGS: IPH, [Porto Alegre]. ANA, [Brasília]. Changes in Flood Magnitude and Frequency Projected for Vulnerable Regions and Major Wetlands of South America Petry, I., Miranda, P. T., Paiva, R. C. D., Collischonn, W., Fan, F. M., Fagundes, H. O., Araujo, A. A., & Souza, S. (2025). Changes in Flood Magnitude and Frequency Projected for Vulnerable Regions and Major Wetlands of South America. Geophysical Research Letters, 52(5). https://doi.org/10.1029/2024GL112436 Other references Siqueira, V. A., Paiva, R. C. D., Fleischmann, A. S., Fan, F. M., Ruhoff, A. L., Pontes, P. R. M., Paris, A., Calmant, S., & Collischonn, W. (2018). Toward continental hydrologic-hydrodynamic modeling in South America. Hydrology and Earth System Sciences, 22(9), 4815–4842. https://doi.org/10.5194/hess-22-4815-2018 Thrasher, B., Wang, W., Michaelis, A., Melton, F., Lee, T., & Nemani, R. (2022). NASA Global Daily Downscaled Projections, CMIP6. Scientific Data 2022 9:1, 9(1), 1–6. https://doi.org/10.1038/s41597-022-01393-4