Algunos aspectos de las fluctuaciones pluviométricas en México, en los últimos cien años

Abstract

Instrumental precipitation records since the last quarter of the XIX century show that significant rainfall fluctuations have ocurred in Central and Northern Mexico. The driest period occurred in the last decade of the last century. Other dry periods were the late 1940´s and first part of the fifties Wet periods in Central Mexico were observed in the thirties and sixties. A decreasing trend has been observed during the first part of the seventies. An attempt is made to explain these changes in terms of fluctuations in the strenght of the Westerlies.