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Inicio  /  Atmósfera  /  Vol: 9 Núm: 3 Par: 0 (1996)  /  Artículo
ARTÍCULO
TITULO

The influence of the regional climate in a lagoon in northeastern Mexico

NORMA SÁNCHEZ SANTILLÁN    
GUADALUPE DE LA LANZA ESPINO    

Resumen

The climate affects the Earth at three levels: the relationships between the Sun-Earth energy interaction, the regional climate by the troposphere-Earth relationship (basins) and the local climate by the climatic gradients in endo and exorreic basins. The information on coastal lagoons provided by the last two is scarce and has only been used to define local descriptive frameworks for particular study areas. As a result of this, this paper aims to determine the qualitative and quantitative influence of regional climate on the three local climates defined in an exorreic basin in the northwestern Gulf of Mexico at the level of regional climate. The coastal lagoon of Tampamachoco is located in one of these local climates. The regional climate affects the local climate and defines the seasons in tropical latitudes (the Gulf of Mexico), in accordance with the origin and amount of the rain. The seasons are defined with respect to the rainfall regimes presented in Köppen's classification, later modified by Garcia (1964), and corroborated with the frequency and intensity of the prevailing winds from 1922 to 1994. These are: 1) the season of northers: from November to February with an average of 222 mm, 2) the dry season: in March and April with an average of 92 mm and 3) the rainy season: from May to October with an average of 1071 mm. Three local climates are defined in response to an orographical factor, as BS1, Aw1 and Aw2. Type Aw1 corresponds to 35% of the basin and is located over the whole coastal plain, type Aw2 makes up 55% over the leeward portion of the Sierra Madre Oriental and the Sierra de Tantima mountain ranges and type BS1 makes up 10% over the windward portion of the Sierra de Tantima. The spatial and temporal differences in the rainfall over the whole basin produce two waterways with multiple sources as a result of the regional climate over the local climate, that affect the shape and hydrological behaviour of the lagoon. The Tuxpam River originates in the most humid climatic area and is a permanent supply to the lagoon with changes in discharge related to the seasons (March 695 m3/s, July 965 m3/s and September 1825 m3/s). The Santiago River, of which the supply is registered only in the rainy season, has its origin in a dry climatic area.

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