Abstract
Increased temperature rates have the potential to change the rainfall regime in a given region, as well as to intensify its extreme events, which may lead to significant and negative socioeconomic and environmental impacts on urban populations. However, knowledge about the extent of changes in rainfall rates in Rio de Janeiro City (RJC) remains incipient; thus, it is necessary applying indices climate change to help better understanding this phenomenon. The aim of the current study is to investigate changes in rainfall distribution and increase in the number of extreme rainfall events in RJC. Daily rainfall data deriving from fifteen weather stations distributed in RJC were analyzed in the RclimDex software and Mann–Kendall test. The analysis has shown increased rainfall rates from the beginning of the series to approximately the first ten years of study. Total rainfall rate has decreased after this period. Rainfall intensity in almost all seasons has decreased after 2005; this outcome has indicated reduced annual rainfall rate and number of wet days. However, there was prevalence of positive trends in daily rainfall rates (Rx1day) and in total rainfall of five consecutive days (Rx5day). The increased number of extreme rainfall events in RJC can cause sudden inundations, floods, runoffs and river overflows with potential to cause landslides and human death due to irregular occupation of hills and slopes.
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Notes
Available at: http://alertario.rio.rj.gov.br/download/dados-pluviometricos. Access on: January 22.nd, 2018.
Available at: http://etccdi.pacificclimate.org/software.shtml. Access on: August 15 th, 2018.
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Regueira, A.O., Wanderley, H.S. Changes in rainfall rates and increased number of extreme rainfall events in Rio de Janeiro city. Nat Hazards 114, 3833–3847 (2022). https://doi.org/10.1007/s11069-022-05545-y
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DOI: https://doi.org/10.1007/s11069-022-05545-y