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Title: Fluxos de amônia e óxido nitroso na interface ar-água do sistema lagunar de Maricá-Guarapina
Keywords: Nitrogênio;  Amônia;  Óxido nitroso;  Lagoas costeiras;  Fluxos de gases;  Modelos de predição de fluxos;  Nitrogen;  Ammonia;  Nitrous oxide;  Coastal lagoons;  Gases fluxes;  Models prediction fluxes
Issue Date: 26-Feb-2008
Abstract: This study examines the nitrous oxide (N2O) and ammonia (NH3) fluxes in Maricá- Guarapina s system. The N2O is a greenhouse gas and is involved in the consumption of the ozone (O3) in the stratosphere. The NH3 can lead to acidification of terrestrial and aquatic environments, eutrophication of aquatic systems and production of N2O. The SLMG is suffering degradation in the water s quality due to urbanization and agricultural activities in the region. This system is composed for four lagoon interconnected between themselves through channels: Maricá, Barra, Father and Guarapina. For the analysis of N2O was used the technique of the static chamber and 4 models prediction fluxes (MPF). In the case of NH3 were made estimates of fluxes through MPF too. The results of this study show that the four lagoons in the SLMG have different behaviors with respect to the fluxes of the two gases analyzed. Estimates of the rates of emission in the system lagoon show that despite the present system lagoons that seem act as sink of N2O and NH3, in a general balance, it gives N to the atmosphere in one form or another. The estimated emission rate ranged between 92,15 g N-1 day-1 and 104,77 g N-1 day-1. Other information that brought this estimate was that the majority of emissions occur in the form of NH3 with estimated emission of 84,79 g N-1 day-1 to 97,41 g N-1 day-1.
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