HR: 1340h
AN: A23C-1461    [Abstracts]
TI: Using the NAME Lagrangian Particle Dispersion model, and aircraft measurements to assess the accuracy of trace gas emission inventories from the U.K.
AU: * O'Sullivan, D A
EM: debbie.osullivan@metoffice.gov.uk
AF: Met Office, FitzRoy Road, Exeter, EX1 3PB, United Kingdom
AU: * O'Sullivan, D A
EM: debbie.osullivan@metoffice.gov.uk
AF: University of East Anglia, Earlham road, Norwich, NR4 7TJ, United Kingdom
AU: Harrison, M
EM: mark.harrison@metoffice.gov.uk
AF: Met Office, FitzRoy Road, Exeter, EX1 3PB, United Kingdom
AU: Ploson, D
EM: d.polson@ceh.ac.uk
AF: Center for Ecology and Hydrology, Bush Estate, Edinburgh, EH26 OQB, United Kingdom
AU: Oram, D
EM: d.e.oram@uea.ac.uk
AF: University of East Anglia, Earlham road, Norwich, NR4 7TJ, United Kingdom
AU: Reeves, C
EM: c.reeves@uea.ac.uk
AF: University of East Anglia, Earlham road, Norwich, NR4 7TJ, United Kingdom
AB: A top-down approach using a combination of aircraft data and atmospheric dispersion modelling has been used to estimate emissions for 24 halogenated trace gases from the United Kingdom. This has been done using data collected during AMPEP/FLUXEX, a U.K based measurement campaign which took place between April and September 2005. The primary objective relating to this work was to make direct airborne measurements of concentration enhancements within the boundary layer arising from anthropogenic pollution events, and then to use mass balance methods to determine an emission flux. This was done by analysing Whole Air Samples (WAS) collected in the boundary layer upwind and downwind of the UK at frequent intervals around the coast using the technique of gas chromatography mass spectrometry (GCMS). Emissions were then calculated using a simple box-model approach and also using NAME (Numerical Atmospheric-dispersion Modelling Environment) which is a Lagrangian particle model using 3 hourly 3D meteorology fields from the Met Office Unified Model. By using such an approach it is also possible to identify the most likely main source regions in the UK for the compounds measured. Among the trace gases studied are many which through their effects on stratospheric ozone, and their large radiative forcing have a direct impact on global climate such as CFC's 11, 12, 113 and 114, HCFC's 21, 22, 141b and 142b, HFC's 134a and 152a, methyl chloroform, methyl bromide and carbon tetrachloride. Also the emissions of some short lived gases with have direct effects on human health, such as tetrachloroethene, and trichloroethene, have been derived. The UK emissions estimates calculated from this experimental and modelling work are compared with bottom-up and other top-down emission inventories for the UK and Europe. It was found that the estimates from this study were often higher than those in bottom-up emission inventories derived from industry. In addition for a number of trace gases, for example HCFC-21 and the HFC's, there are no accurate emissions estimates available due to privacy laws which in the UK restrict the availability of the production and sales data required to construct bottom-up emission inventories. Therefore for some of the compounds included in this study, this work provides the first available estimate of UK emissions.
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0490 Trace gases
DE: 4854 Physical chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting