Resumo

RUIZ-ALVAREZ, O et al. Water balance and climatic classification of the state of Tabasco, Mexico. Universidad y ciencia [online]. 2012, vol.28, n.1, pp.1-14. ISSN 0186-2979.

This study focused on the water balance and climatic classification of the state of Tabasco, in order to define seasons and regions with a deficit or a surplus of moisture and to classify the climate of the state following Thornthwaite's method. Of the weather stations in the state, 40 were selected that provided average monthly values of temperature and rainfall. The others did not record these two variables. Of the 40 stations, 25 also had evaporation data. Two methods were used to calculate the reference evapotranspiration (ET₀): the Hargreaves and the Evaporation Pan. The first was used in the 40 stations and the second in the 25 stations that had evaporation data (the ET₀ was also calculated with the Hargreaves method for these last). A linear model was generated with 20 of the 25 stations, comparing the ET_0Hargreaves data with the ET_0Tanque data. The remaining five stations were used to determine the accuracy of the model. The model corrected the ET_0Hargreaves calculated for the 15 stations with no evaporation data. The Thornthwaite-Mather type Climatic Water Balance was calculated from the reference evapotranspiration and the rainfall. Four regions with different moisture were identified. The greatest surplus was located in the south of the state, and the Poblado C32 station presented the greatest annual deficit. The moisture indices obtained identified five types of climate for the state of Tabasco.

Palavras-chave : Climatic Water Balance; climatic classification for the state of Tabasco; reference evapotranspiration; moisture index.

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