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The spatial distribution of these emissions was based on workday population density derived from the 2011 census data. The estimated UK annual COA emission was 7.4 Gg per year, which is an almost 10 % addition to the officially reported UK national total anthropogenic emissions of PM2.5 (82 Gg in 2012), corresponding to 320 mg person−1 day−1 on average. Weekday and weekend diurnal variation in COA emissions were also based on the AMS measurements. Modelled concentrations of COA were then independently evaluated against AMS-derived COA measurements from another city and time period (Manchester, Jan–Feb 2007), as well as with COA estimated by a chemical mass balance model of measurements for a two-week period at the Harwell rural site (~ 80 km west of central London).
The modelled annual average contribution of COA to ambient particulate matter (PM) in central London was between 1–2 μg m−3 (~ 20 % of total measured OA1), and between 0.5–0.7 μg m−3 in other major cities in England (Manchester, Birmingham, Leeds). It was also shown that cities smaller than London can have a central hot-spot of population density of smaller area than the computational grid cell, in which case higher localised COA concentrations than modelled here may be expected.
Modelled COA concentrations dropped rapidly outside of major urban areas (annual average of 0.12 μg m−3 for the Harwell location), indicating that although COA can be a notable component in urban air, it does not have a significant effect on PM concentrations on rural areas.
The possibility that the AMS PMF-apportionment measurements overestimate COA concentrations by up to a factor of 2 is discussed. Since COA is a primary emission, any downward adjustments in COA emissions would lead to a proportional linear downward scaling in the absolute magnitudes of COA concentrations simulated in the model.
- cooking organic aerosol
- Air pollution
- Air quality modelling
FingerprintDive into the research topics of 'Model simulations of cooking organic aerosol (COA) over the UK using estimates of emissions based on measurements at two sites in London'. Together they form a unique fingerprint.
- 1 Finished
1/10/12 → 31/03/16