Abstract

GARCIA-PAEZ, Fernando  and  CRUZ-MEDINA, Isidro R.. Variability of rainfall in the North Pacific Region of Mexico. Agrociencia [online]. 2009, vol.43, n.1, pp.1-9. ISSN 2521-9766.

Annual climatic changes and those from one period to another may be attributed to natural climate variability as well as to the change caused by anthropogenic activities. In order to determine the significance of the changes observed in Region III of the North Pacific (RPN), pluviometric variability of daily, monthly, and annual rainfall of the selected historical records of 74 weather stations was analyzed, located in the 13 climatic regions of the RPN in the period 1921-2004. Analyses of variance and the Kruskall-Wallis test were used to compare the means and medians of rainfall intensity in the last 25 and 10 years to their previous records. The maximum summer rainfalls in two periods were compared until 1979, and from 1980 to 2004. The McNemar test shows (p<0.05) that in the two periods, rainfall mean intensity increased, and that the climatic region with the greatest changes is the Bs1(h)w region which includes four municipalities of Chihuahua and five of Sinaloa. The McNemar test demonstrated that there are no changes (p>0.05) in the maximum summer rainfalls of the RPN.

Keywords : Mean and median rainfall intensity; analysis of variance; Kruskall-Wallis and McNemar tests.

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