Ozone production from the interaction of wildfire and biogenic emissions: a case study in Russia during spring 2006 1Division of Environmental Physics and Meteorology, Department of Physics, National and Kapodistrian University of Athens, Building PHYS-5, Panepistimioupolis, 15784 Athens, Greece
06 Sep 2012
2Institute for Environmental Research and Sustainable Development, National Observatory of Athens, I. Metaxa & V. Pavlou, P. Penteli (Lofos Koufou) 15236, Athens, Greece
3Institute for Space Applications and Remote Sensing, National Observatory of Athens, I. Metaxa & V. Pavlou, P. Penteli (Lofos Koufou) 15236, Athens, Greece
4Finnish Meteorological Institute, Erik Palmenin aukio 1, P.O. Box 503, 00101 Helsinki, Finland
Received: 07 Nov 2011 – Published in Atmos. Chem. Phys. Discuss.: 31 Jan 2012Abstract. The objective of this study is to investigate the contribution of biomass
burning emissions to O3 production during small-scale dry-grass fires over
Western Russia (24 April–10 May 2006) as well as to quantify the effect of
biogenic emissions in this environment. By using the Factor Separation
methodology, we evaluate the pure contribution of each one of these two
sources and we appoint the significance of their synergistic effect on O3
production. The total (actual) contribution of each source is also estimated.
Sensitivity simulations assess the effect of various fire emission
parameters, such as chemical composition, emissions magnitude and injection
height. The model results are compared with O3 and isoprene observations
from 117 and 9 stations of the EMEP network, respectively.
Revised: 03 Jul 2012 – Accepted: 22 Aug 2012 – Published: 06 Sep 2012
Model computations show that the fire episode determines the sensitivity of
O3 chemistry in the area. The reference run which represents grass fires
with high NOx/CO emission ratio (0.06) is characterized by
VOC-sensitive O3 production. In that case, the pure impact of fire
emissions on surface O3 is up to 40–45 ppb, while their synergistic
effect with the biogenic emissions is proven significant (up to 8 ppb).
Under a lower NOx/CO molar ratio (0.025, representative of
agricultural residues), the area is characterized by NOx-sensitive
chemistry and the maximum surface O3 predictions are almost doubled due to
higher O3 production at the fire spots and lower fires' NO emissions.
Citation: Bossioli, E., Tombrou, M., Karali, A., Dandou, A., Paronis, D., and Sofiev, M.: Ozone production from the interaction of wildfire and biogenic emissions: a case study in Russia during spring 2006, Atmos. Chem. Phys., 12, 7931-7953, doi:10.5194/acp-12-7931-2012, 2012.