Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
9
16
2009
10.5194/acp-9-6077-2009
http://www.atmos-chem-phys.net/9/6077/2009/
http://www.atmos-chem-phys.net/9/6077/2009/acp-9-6077-2009.html
http://www.atmos-chem-phys.net/9/6077/2009/acp-9-6077-2009.pdf
6077
6093
2009-08-21
Effect of regional precursor emission controls on long-range ozone transport – Part 1: Short-term changes in ozone air quality
J. J. West
jasonwest@unc.edu
V. Naik
L. W. Horowitz
A. M. Fiore
University of North Carolina, Chapel Hill, NC, USA
Princeton University, Princeton, NJ, USA
NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA
now at: ATMOS Research and Consulting, Lubbock, TX, USA
Observations and models demonstrate that ozone and its precursors can be
transported between continents and across oceans. We model the influences of
10% reductions in anthropogenic nitrogen oxide (NO<sub>x</sub>) emissions from
each of nine world regions on surface ozone air quality in that region and
all other regions. In doing so, we quantify the relative importance of
long-range transport between all source-receptor pairs, for direct
short-term ozone changes. We find that for population-weighted
concentrations during the three-month "ozone-season", the strongest
inter-regional influences are from Europe to the Former Soviet Union, East
Asia to Southeast Asia, and Europe to Africa. The largest influences per
unit of NO<sub>x</sub> reduced, however, are seen for source regions in the
tropics and Southern Hemisphere, which we attribute mainly to greater
sensitivity to changes in NO<sub>x</sub> in the lower troposphere, and secondarily
to increased vertical convection to the free troposphere in tropical
regions, allowing pollutants to be transported further. Results show, for
example, that NO<sub>x</sub> reductions in North America are ~20% as
effective per unit NO<sub>x</sub> in reducing ozone in Europe during summer, as
NO<sub>x</sub> reductions from Europe itself. Reducing anthropogenic emissions of
non-methane volatile organic compounds (NMVOCs) and carbon monoxide (CO) by
10% in selected regions, can have as large an impact on long-range ozone
transport as NO<sub>x</sub> reductions, depending on the source region. We find
that for many source-receptor pairs, the season of greatest long-range
influence does not coincide with the season when ozone is highest in the
receptor region. Reducing NO<sub>x</sub> emissions in most source regions causes a
larger decrease in export of ozone from the source region than in ozone
production outside of the source region.
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