Effect of regional precursor emission controls on long-range ozone transport – Part 1: Short-term changes in ozone air quality
Item
Title (Dublin Core)
Effect of regional precursor emission controls on long-range ozone transport – Part 1: Short-term changes in ozone air quality
Description (Dublin Core)
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.
Creator (Dublin Core)
West, J. J.
Naik, V.
Horowitz, L. W.
Fiore, A. M.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-9-6077-2009
https://acp.copernicus.org/articles/9/6077/2009/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
