This research investigated turbulent fluxes of CO2 and energy at the interface of the Caxiuanã bay – atmosphere in the Caxiuanã National Forest (FLONA) located in the Eastern Amazon under influence of atmospheric variables, the bay dimension and the temperature gradient at the interface bay-atmosphere, during the years of 2013 and 2014. The data used in this study were obtained on average 7 meters above the water slide from a micrometeorological tower, installed in the Caxiuanã bay. Measures of fluxes of CO2 (FCO2), sensible heat (H) and latent heat (Le) were collected through a turbulent vortices system. Meteorological data were collected by an automatic weather station. It was verified that the precipitation registered in the studied years was superior to climatic standards. The average hourly water temperature of the bay was always higher than the air temperature over the months. The mean monthly vertical temperature gradient at the bay - atmosphere interface was always positive, reaching the highest and lowest values in the rainy and dry period, respectively. The results show a strong seasonal pattern in the partition of the energy balance to heat the atmosphere (H) and for the evaporation process (Le). In the FCO2 analysis we can verify a clear seasonal pattern with the rainy and dry period of the region, that is, the magnitudes of FCO2, both emission and sequestration by the bay, are higher in the rainy months when compared to the dry months.
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