Resumo

ORTIZ-JIMENEZ, Mario A.  e  ANDA, José de. Heat balance and water-nutrient food chain interactions in lake Zapotlán, México. Agrociencia [online]. 2007, vol.41, n.4, pp.447-458. ISSN 2521-9766.

This paper presents a heat balance for Lake Zapotlán, which was solved numerically using the fourth-order Runge-Kutta method with a step size of one day. Like other tropical lakes, the annual heat budget of Lake Zapotlán is very low. Lake temperature (correlated with both atmospheric longwave radiation and water back radiation), wind strength (correlated with solar shortwave radiation, and runoffs (correlated with atmospheric longwave radiation, water back radiation, precipitation on lake and lake temperature) produce lake mixing during three seasons: winter, spring and summer. When fall begins, as the net surface heat flux diminishes and rainfall ends, the epilimnion is slightly cooled since this layer receives colder, denser runoff. This small difference in temperature causes the water column to stratify in an unstable manner. The alternating episodes of mixing and stratification significantly affect the nutrient cycle and the dynamics of the food chain.

Palavras-chave : Stratification; fourth-order Runge-Kutta method; mixing; atmospheric radiation; water back radiation.

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