Measurements of landscape-scale fluxes of carbon dioxide in the Peruvian Amazon by vertical profiling (original) (raw)

Vertical profiles of carbon dioxide were measured within and above the atmospheric boundary layer at a tropical forest site in the Peruvian Amazon during July 1996 using a tethered balloon sampling platform. Flask samples were collected within and above the mixed layer and analyzed off-site for carbon dioxide by nondispersive infrared spectrophotometry. Ozone and temperature vertical profiles were used to determine the boundary layer heights and growth rates. The mean values for methane, carbon monoxide, hydrogen, carbon-13, and oxygen-18 ratios were determined within and above the mixed layer. Daytime carbon dioxide flux values were calculated using the budget method. Nocturnal fluxes were estimated by integrating the carbon dioxide mixing ratios as a function of height from the ground to the inversion layer and dividing the total accumulated carbon dioxide by the time since sunset. The daytime carbon dioxide flux of-13 + 2 •tmol C m '2 s '• and the nocturnal flux of +5.0 + 1.0 •tmol C m '2 s '• are in good agreement with previous studies in the Brazilian Amazon. phere and the higher deposition rate of nitrogen and other minerals [Gifford, 1994; Eamus and Jarvis, 1989; McMurtrie et al., 1992; McGuire et al., 1995]. On the other hand, their continued destruction through deforestation and biomass burning is a significant short-term carbon dioxide source that ultimately decreases the forest's potential as a carbon sink [Auclair and Bedford, 1993; Vloedbeld and Leeroans, 1993; Brown et al., 1993].

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