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Author(s): M. L. Bell & H. Ellis
Abstract:
In many areas, natural sources contribute a substantial fraction of volatile organic
compound (VOC) emissions, which are precursors to tropospheric ozone (O3).
To investigate the significance of biogenic VOC emissions on ozone formation,
meteorological and air quality modelling were used to generate hourly ozone
estimates for a case-study high ozone episode in the Mid-Atlantic region of the
United States for three emissions scenarios: actual emissions; a 100% increase in
biogenic VOCs; and an additional 100% increase in vehicular emissions of
ozone precursors.
The modelled concentrations reflect the total effect of changes
from emissions, incorporating interactions between anthropogenic and biogenic
emissions.
Elevated biogenic emissions had a larger impact on ozone
concentrations than did the comparable relative increase in vehicular emissions.
For instance, the increased biogenics raised the max 1-h ozone level by 54 ppb,
however the additional increase in vehicular emissions added only a further 17
ppb.
The highest ozone levels and the largest increases in ozone typically were
observed in urban areas for both increased emissions scenarios.
Results indicate
the importance of biogenic emissions for ozone formation in this region.
This has
implications for the design and implementation of ozone policies as these
emissions are difficult to control, and for the impacts of climate change, which
could raise biogenic VOCs levels through elevated temperature.
Keywords:
ozone, air pollution, air quality modelling, volatile organic
compounds, nitrogen oxides, biogenic emissions.
...
Pages: 7
Size: 366 kb
Paper DOI: 10.2495/AIR050101
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