Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 6 2009 10.5194/acp-9-1971-2009 http://www.atmos-chem-phys.net/9/1971/2009/ http://www.atmos-chem-phys.net/9/1971/2009/acp-9-1971-2009.html http://www.atmos-chem-phys.net/9/1971/2009/acp-9-1971-2009.pdf 1971 1987 2009-03-19 Mixing ratios and eddy covariance flux measurements of volatile organic compounds from an urban canopy (Manchester, UK) B. Langford B. Davison E. Nemitz C. N. Hewitt n.hewitt@lancaster.ac.uk Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK Centre for Ecology & Hydrology (CEH) Edinburgh, Bush Estate, Penicuik, EH26 0QB, UK Mixing ratios and fluxes of six selected volatile organic compounds (VOCs) were measured above the city of Manchester (UK) during the summer of 2006. A proton transfer reaction-mass spectrometer was used for the measurement of mixing ratios, and fluxes were calculated from these using both the disjunct and the virtual disjunct eddy covariance techniques. The two flux systems, which operated in alternate half hours, showed good agreement, with <i>R²</i> values ranging between 0.74 and 0.9 for the individual analytes. On average, fluxes measured in the disjunct mode were approximately 20% lower than those measured in the virtual mode. This difference is due to both the dampening of the VOC signal by the disjunct flux sampler and carry over from one sample to the next. Correcting for these effects reduced the difference to less than 7%. Observed fluxes are thought to be largely controlled by anthropogenic sources, with vehicle emissions the major contributor. However, both evaporative and biogenic emissions may account for some of the VOCs present. 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