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Assessment and characterization of the monthly probabilities of rainfall in Midwest Brazil using different goodness-of-fit tests as probability density functions selection criteria

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Abstract

The probable rainfall is an excellent climatic parameter of information since it consists of the highest/lowest expected rainfall for a particular period of the year considering a certain level of probability. This study aims to evaluate traditional PDF performance using different goodness-of-fit tests to establish a criterion for choosing them on a monthly rainfall scale, in Mato Grosso do Sul, Brazil. The Cramer-von Misses (CVM) and Anderson–Darling (AD) tests were the most rigorous in rejecting the hypothesis of PFD suitable for monthly rainfall data, while the Kolmogorov–Smirnov (KS) was the least rigorous. The application of stricter goodness-of-fit tests as the CVM implies the use of up to 60% fewer series compared to the KS test. However, suitable series by the KS test presented erroneous estimates of probable monthly rainfall. The CVM and AD tests indicate the PDF with the best statistical performance (higher precision and accuracy between the observed and estimated frequency by the PDF) in more than 60% of situations. The most suitable PDFs for total monthly rainfall by the goodness-of-fit tests was gamma (12 months of the year). The exponential and Generalized Extreme Values (GEV) can be used for both the dry and rainy periods, respectively. The parameters of PDF are correlated with geographical variables, describing the total monthly rainfall distribution such as, for example, the influence of the South Atlantic Subtropical Anticyclone, the South Atlantic Convergence Zone in the rainy period, and the orographic effect in the dry period.

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Data availability

The datasets generated during and/or analyzed during the current study are available in the Hydroweb repository: www.snirh.gov.br/hidroweb/serieshistoricas. The R script used in the article will be fully available by request, in order to contribute to transparency.

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Acknowledgements

The authors would like to thank the National Water and Sanitation Agency (ANA), the Federal Rural University of Rio de Janeiro, Federal University of Mato Grosso do Sul, Federal University of Alagoas, Federal University of Viçosa, Federal University of Espirito Santo, University of Žilina, and Water Management Institute of Minas Gerais (IGAM).

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Abreu, M. C.: conceptualization, design of methodology, data acquisition, data analysis, writing and editing, data curation, software. Souza A.: conceptualization, design of methodology, data acquisition, data analysis, writing, review and editing, data curation. Lyra, G. B.: conceptualization, design of methodology, data acquisition, data analysis, writing, review and editing, data curation, software. Oliveira-Junior, J. F.: conceptualization, design of methodology, data acquisition, data analysis, writing, review and editing. Pobocikova, I.: data analysis, writing, review and editing. Almeida, L.T.: data analysis, writing, review and editing and software. Fraga, M. S.: data analysis, writing, review and editing and software. Aristone, F.: data acquisition, data curation, writing, review and editing. Cecílio, R. A.: conceptualization, methodology design, writing, review and editing.

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Correspondence to Marcel Carvalho Abreu.

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Abreu, M.C., de Souza, A., Lyra, G.B. et al. Assessment and characterization of the monthly probabilities of rainfall in Midwest Brazil using different goodness-of-fit tests as probability density functions selection criteria. Theor Appl Climatol 151, 491–513 (2023). https://doi.org/10.1007/s00704-022-04286-z

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