A spatiotemporal assessment of the high-resolution CHIRPS rainfall dataset in southwestern Colombia using combined principal component analysis

https://doi.org/10.1016/j.asej.2022.101739Get rights and content
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Abstract

Long and temporal time-consistency rainfall time series are essential for studying climate; nevertheless, raingauge stations are unevenly distributed across southwestern Colombia. This research paper assesses the consistency of the satellite rainfall estimate from Climate Hazards Group Infrared Precipitation (CHIRPS) via pixel-to-point comparison with 46 observed monthly rainfall time series using four pairwise metrics and Combined Principal Component Analysis (CPCA). Two Combined Principal Components (CPC) were also used to determine the relationship with the Sea Surface Temperature (SST) through simultaneous linear correlation maps. The results showed that CHIRPS has a better performance in the Andean region than in the Pacific region. The correlation between CPC1 (CPC2) and SST showed a typical El Niño Southern Oscillation pattern with an inverse (direct) relationship between the rainfall in the Andean (Pacific) Region. Finally, our results validate that CHIRPS can be included in further studies of the spatiotemporal dynamics of rainfall in Southwestern Colombia.

Keywords

Combined Principal Component Analyses
Pairwise comparison
Satellite rainfall estimates and Southwestern Colombia

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Camilo Ocampo Marulanda, is a researcher at the Faculty of Engineering of the Universidad del Valle in Cali - Colombia. Affiliated to the research group of Water Resources and Soil Engineering IREHISA since 2016. The author is a sanitary and environmental engineer, agricultural engineer and master in engineering. He currently teaches in the Faculty of Natural Sciences and Engineering at the Fundación Universitaria de San Gil, Yopal-Colombia. His research topics have been climatology, extreme weather events, geography and hydrology. Additional and updated information can be found at: https://www.linkedin.com/in/camilo-ocampo-marulanda-51a880119/. Contact me at: [email protected]

Peer review under responsibility of Ain Shams University.