Analysis of the IMERG-GPM precipitation product analysis in brazilian midwestern basins considering different time and spatial scales
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2022-08
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Resumo
Precipitation products derived from satellites have emerged as a promising approach for
obtaining precipitation estimates, enabling accurate long-term observations and describing the water
cycle dynamics from a global scale to a local scale. The quality of these products has improved
significantly in the last decades, especially with the emergence of TRMM missions and its successor
GPM. The objective of this study was to evaluate the daily, monthly and annual precipitation estimates
provided by IMERG version 05 of the GPM, with the data observed by the rainfall stations of the
Brazilian Agency of Water and Sanitation (ANA) in the basins of the Brazilian midwest. In order to
compare the data, the spatialization of the data of the rainfall stations was performed by means of
the ordinary kriging technique, interpolating the data for grids of 0.1◦ × 0.1◦
that correspond to the
specialized grids of the GPM satellite. The data were evaluated quantitatively by means of statistical
metrics. The GPM satellite precipitation product performed relatively well on a daily scale for regions
with smooth topography, and was able to describe the rainfall regime on larger time scales, regardless
of the terrain conditions. However, the satellite retrievals were unable to reproduce rainfall extremes
in virtually all situations, which may limit their application in frequency analyses.
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IMERG-GPM, Precipitation, Rain gauges, Assessment, Statistic
Citação
DUARTE, Luíza Virgínia; FORMIGA, Klebber Teodomiro Martins; COSTA, Veber Afonso Figueiredo. Analysis of the IMERG-GPM precipitation product analysis in brazilian midwestern basins considering different time and spatial scales. Water, Basileia, v. 14, n. 16, e2472, 2022. DOI: 10.3390/w14162472. Disponível em: https://www.mdpi.com/2073-4441/14/16/2472. Acesso em: 11 Dez. 2024.