Nitrogen compound emission from biomass burning in tropical African savanna FOS/DECAFE 1991 experiment (Lamto,Ivory Coast) |
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Authors: | Robert Delmas Jean Pierre Lacaux Jean Claude Menaut Luc Abbadie Xavier Le Roux Gunter Helas Jurgen Lobert |
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Institution: | (1) Laboratoire d'Aérologie (URA CNRS 354), Université Paul Sabatier, Toulouse, France;(2) Laboratoire d'Ecologie, Ecole Normale Supérieure, Paris, France;(3) Max Planck Institut für Chemie, Mainz, Germany |
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Abstract: | Gaseous nitrogen compounds (NO
x
, NO
y
, NH3, N2O) were measured at ground level in smoke plumes of prescribed savanna fires in Lamto, in the southern Ivory Coast, during the FOS/DECAFE experiment in January 1991. During the flaming phase, the linear regression between NO
x
] and CO2] (differences in concentration between smoke plumes and atmosheric background) results volumic emission ratio NO
x
]/CO2]=1.37×10–3 with only slight differences between heading and backing fires. Nearly 90% of the nitrogen oxides are emitted as NO. Average emission ratios of other compounds are: 1.91, 0.047, and 0.145×10–3 for NO
y
, NH3 and N2O, respectively. The emission ratios obtained during this field experiment are compred with corresponding values measured during former experiments with the same plant species in combustion chambers. An accurate determination of both the biomass actually burned and of the plant nitrogen content, allows an assessment of emission fluxes of N-compounds from Guinean savanna burns. Preliminary results dealing with the influence of fire on biogenic emissions from soils are also reported. |
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Keywords: | biomass burning savanna fires biogenic emissions nitrogen compounds |
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