Articles | Volume 14, issue 5
Nat. Hazards Earth Syst. Sci., 14, 1169–1183, 2014

Special issue: Numerical wildland combustion, from the flame to the...

Nat. Hazards Earth Syst. Sci., 14, 1169–1183, 2014

Research article 20 May 2014

Research article | 20 May 2014

Modelling the NO emissions from wildfires at the source level

Y. Pérez-Ramirez1, P.-A. Santoni1, and N. Darabiha2 Y. Pérez-Ramirez et al.
  • 1UMR CNRS 6134 – SPE, University of Corsica, Corte, France
  • 2Laboratoire EM2C, CNRS UPR 288, Ecole Centrale Paris, Chatenay Malabry, France

Abstract. There is a growing interest to characterize fire plumes in order to control air quality during wildfire episodes and to estimate the carbon and ozone balance of fire emissions. A numerical approach has been used to study the mechanisms of NO formation at the source level in wildfires given that NO plays an important role in the formation of ground-level ozone. The major reaction mechanisms involved in NO chemistry have been identified using reaction path analysis. Accordingly, a two-step global kinetic scheme in the gas phase has been proposed herein to account for the volatile fuel-bound nitrogen (fuel-N) conversion to NO, considering that the volatile fraction of fuel-N is released as NH3. Data from simulations using the perfectly stirred reactor (PSR) code from CHEMKIN-II package with a detailed kinetic mechanism (GDF-Kin® 3.0) have been used to calibrate and evaluate the global model under typical wildfire conditions in terms of the composition of the degradation gases of vegetation, the equivalence ratio, the range of temperatures and the residence time.

Final-revised paper