Spatiotemporal distribution of precipitation and its characteristics under tropical atmospheric systems of Brazil: Insights from a large sub‐hourly database

• DOI: 10.1002/hyp.15017
• Publication Date: 2023-11-13T03:35:00Z
• Authors: Filipe C. Lemos; Victor Hugo R. Co...; Emerson da S. Fre...; Javier Tomasella; Guillaume F. Bert...; Marcela A. Meira; Geraldo M. Ramos ...; Andrew Fullhart; Cristiano das N. ...
• Keywords: Biome

Abstract The study of rainfall properties at various spatiotemporal scales is deeply important for understanding a large range socio‐environmental processes and variables (e.g., water resources, agriculture, socio‐ecosystemic services, natural risk assessment). However, such studies on characteristics, especially sub‐hourly resolutions, are scarce in areas South America due to the lack high‐resolution temporal database. Brazilian National Centre Monitoring Early Warning Natural Disasters (CEMADEN) has gradually implemented, starting 2013, monitoring network composed approximately 3500 automated rain gauges distributed across Brazil, enabling access new hydrological this vast tropical country featuring biomes. This analysed characteristics events whole Brazil sub‐daily timescales, using 7 years data (from 2014 2021) provided by CEMADEN. Rainfall were defined minimum inter‐event time (MIT) depth (1 mm). Seven MITs (30, 60, 120, 180, 360, 720, 1440 min) considered evaluate behaviour event their relationships. Gaussian mixture model method was applied identify regions with similar patterns according MIT. Six groups homogeneous identified, evidencing climatic diversity Brazil. results show that MIT strongly influences precipitation (especially dry number events). highest occurred North‐east Coast region, which exceeded 200 per year (MIT < 60 min), while lowest observed Semiarid reached only 38 an min. Moreover, intensities found Central region. provide better its highlighting climatological country.