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A principal component analysis approach to assess CHIRPS precipitation dataset for the study of climate variability of the La Plata Basin, Southern South America

Author

Listed:
  • Wilmar Loaiza Cerón

    (Universidad del Valle
    Programa de Pós-Graduação em Clima e Ambiente (CLIAMB, INPA/UEA))

  • Jorge Molina-Carpio

    (Universidad Mayor de San Andrés)

  • Irma Ayes Rivera

    (Programa de Pós-Graduação em Clima e Ambiente (CLIAMB, INPA/UEA))

  • Rita Valeria Andreoli

    (Universidade do Estado do Amazonas)

  • Mary Toshie Kayano

    (Instituto Nacional de Pesquisas Espaciais)

  • Teresita Canchala

    (Universidad del Valle)

Abstract

This article assesses the consistency of the satellite precipitation estimate CHIRPS v.2 to describe the spatiotemporal rainfall variability in the La Plata Basin (LPB), the second largest hydrographic basin in South America, by (a) pixel-to-point comparison of CHIRPS data with 167 observed monthly precipitation time series using three pairwise metrics (coefficient of correlation, bias and root mean square error) and (b) principal component analysis (PCA) to evaluate the large-scale coherence between CHIRPS and rain gauge data. The pairwise metrics indicate that CHIRPS better represents the rainfall in the coastal, northeastern and southeastern parts of the basin than in the Andean region to the west. The PCA shows that CHIRPS describes most of the observed rainfall variability in the LPB, but contains more variability, especially during December–February and March–May seasons. The two major modes observed are highly correlated spatially (empirical orthogonal functions—EOFs) and temporally (principal components—PCs) with the corresponding CHIRPS modes. The PCA allows the determination of the main rainfall variability modes and their possible relations with climate variability modes. Besides, the analyses of the precipitation anomaly modes show that the El Niño Southern Oscillation explains the first EOF modes of datasets. The PCA provides an alternative and effective means of assessing the consistency of CHIRPS data in representing spatial and temporal rainfall variability in the LPB.

Suggested Citation

  • Wilmar Loaiza Cerón & Jorge Molina-Carpio & Irma Ayes Rivera & Rita Valeria Andreoli & Mary Toshie Kayano & Teresita Canchala, 2020. "A principal component analysis approach to assess CHIRPS precipitation dataset for the study of climate variability of the La Plata Basin, Southern South America," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 103(1), pages 767-783, August.
  • Handle: RePEc:spr:nathaz:v:103:y:2020:i:1:d:10.1007_s11069-020-04011-x
    DOI: 10.1007/s11069-020-04011-x
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    1. Henry Kaiser, 1970. "A second generation little jiffy," Psychometrika, Springer;The Psychometric Society, vol. 35(4), pages 401-415, December.
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