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We explored the effect of the Madden-Julian oscillation (MJO) on the rainfall in different regions of Colombia by comparing the Madden-Julian index (MJI) and precipitation indexes (PI) using correlation coefficients and wavelet spectra comparison. We found that the MJO extreme phases related to precipitation anomalies, but in the correlation analysis we obtained very low coefficients, although the spectra of the series of both MJI and PIs showed a clear signal over the period of 30 days. In comparing the response of IPs to the extreme phases of the MJO, expressed in maximum and minimum values of the MJI at 120°W, we established that under the IMJ positive extremes (positive or subsidence phase) pentadal precipitation decreased in some of the regions, while in the negative extremes (negative or convective phase) we registered an increase; in seven of the 24 regions, no response pattern was identified. Based on this finding, we produced two maps of the response of regional rainfall in the MJO extreme phases (a map for the response to MJI minimum values, and another for the maximum values), which could be used for operational climate prediction in some regions of Colombia. © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.References
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