Abstract

PEREZ-ORTIZ, Mayra Alejandra; MONTENEGRO-MURILLO, Daniel David  and  VARGAS-FRANCO, Viviana. Analysis of the influence of climatic variability on precipitation in the Cali River basin, Colombia. Dyna rev.fac.nac.minas [online]. 2022, vol.89, n.221, pp.168-177.  Epub Sep 14, 2022. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v89n221.101607.

The analysis of the spatial and temporal variability of precipitation is a transcendental component for decision making in watersheds because it influences the activities of the people who inhabit them; however, in Colombia this type of research is carried out mainly at national and departmental levels, leaving aside studies at watershed scale. For this reason, in this study, an analysis of the influence of the El Niño Southern Oscillation phenomenon on the spatial and temporal distribution of precipitation in the Cali River Basin was carried out. The methodology consisted of the estimation of missing data, precipitation anomalies, comparison of various indices such as ONI, SOI and EMI and the spatial and temporal analysis of precipitation. During the study years 1972 to 2016, a 10% decrease in rainfall was observed in the upper area of the Cali River basin, with a negative trend, in addition, it was found that the months of May and August are more susceptible to events of extreme precipitation in periods of the ENSO phenomenon. Among the probable causes of the decrease in rainfall in the study area, it has been found that the change in the average state of rainfall in the tropical Pacific (Andean region) tends to show a pattern similar to El Niño.

Keywords : climatic variability; watershed; phenomenon El Niño; ENSO; ONI; Cali River.

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