Journal article

Ozone production from the interaction of wildfire and biogenic emissions: A case study in Russia during spring 2006

Bossioli E, Tombrou M, Karali A, Dandou A, Paronis D, Sofiev M ...see all

Atmospheric Chemistry and Physics, vol. 12, issue 17 (2012) pp. 7931-7953

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Abstract

The objective of this study is to investigate the contribution of
biomass burning emissions to O-3 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 O-3 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 O-3 and isoprene observations from 117 and 9 stations of the EMEP
network, respectively.
Model computations show that the fire episode determines the sensitivity
of O-3 chemistry in the area. The reference run which represents grass
fires with high NOx/CO emission ratio (0.06) is characterized by
VOC-sensitive O-3 production. In that case, the pure impact of fire
emissions on surface O-3 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 O-3 predictions are almost doubled due to higher O-3
production at the fire spots and lower fires' NO emissions.

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