Extreme rainfall events in the Metropolitan Region of Rio de Janeiro: Variability and trends

IF 6 2区工程技术 Q1 ENVIRONMENTAL SCIENCES

Urban Climate Pub Date : 2025-02-01 DOI:10.1016/j.uclim.2025.102330

Sofia Siqueira Lima , Núbia Beray Armond

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引用次数: 0

Abstract

This study examines the spatial and temporal variability of extreme precipitation events in the Metropolitan Region of Rio de Janeiro, considering the urban area's topographical characteristics. Daily precipitation data from 50 rainfall stations in nine municipalities was studied for two periods (1970–2020 and 2008–2020) using homogenization techniques and ETCCDI indices to detect extremes. Three indexes (RX1Day, RX5Day, and R99p) were utilized to define extreme events, and non-parametric tests were employed to discover patterns in frequency and magnitude. The findings suggest that high altitudes, such as Serra do Mar and the Coastal Massifs, raise the extreme rainfall thresholds (R99p) and concentrate heavy precipitation to windward during concentrated (RX1Day) and persistent (RX5Day) events. The results also revealed changes in the pattern of extreme variability over the previous two decades, with an increase in outliers and the yearly amplitude and median of concentrated and persistent events (Rx1Day and Rx5Day). Despite having a lower frequency than January and March, April showed the most considerable variability for concentrated and persistent occurrences. The metropolitan east experiences an increase in the frequency and magnitude of extremes, mostly in annual distribution, rainy season, and dry season, whereas the urban center-north experiences a drop in frequency and amplitude.

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来源期刊

Urban Climate Social Sciences-Urban Studies

CiteScore

9.70

自引率

9.40%

发文量

286

期刊介绍： Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]