The influence of mountainous relief on the vertical gradient of precipitation and pluvial zoning in the central slope of the Gulf of Mexico.

Although variation of air temperature with respect to terrain altitude is widely understood, less is known about the altitudinal behaviour of precipitation. The eastern slope of Mexico is the most contrasting physiographic province of the country due to its relief. This area is also one of the most important regions of Mexico and of the intertropical region of America because of its biodiversity. Due to the vital and ecosystemic value of precipitation, this work seeks to analyse the altitudinal distribution of precipitation as a function of the relief. Our main methodology consisted of analysing the climatological normal of 86 weather stations to determine accumulated precipitation during rainy, dry and annual periods. Precipitation was correlated with the altitude of the relief, which allowed the study area to be divided into groups relative to the degree of accumulated rainfall throughout the year, as well as by the gradient of variation according to the elevation of the terrain. The results indicated that during the year, precipitation was favoured by the humidity of the Gulf of Mexico and decreased at a rate of -3.7 mm/m in coastal areas. Subsequently, precipitation increased with the altitude of the relief at a rate of 0.7 mm/m, between ~700 and ~1500 masl, which is where the greatest accumulation of rainfall was concentrated. Thereafter, it decreased by -0.9 mm/m until it reached the highest volcanic watershed. Crossing this watershed, the foehn effect caused rainfall rates to be much lower than on the windward slope, where the central plateau of the country begins. [ABSTRACT FROM AUTHOR]