Articles | Volume 9, issue 5
Atmos. Chem. Phys., 9, 1521–1535, 2009

Special issue: European Integrated Project on Aerosol-Cloud-Climate and Air...

Special issue: Dynamics of gases and particles in the urban atmosphere...

Special issue: EMEP – an integrated system of models and observations...

Atmos. Chem. Phys., 9, 1521–1535, 2009

  02 Mar 2009

02 Mar 2009

Fossil and non-fossil sources of organic carbon (OC) and elemental carbon (EC) in Göteborg, Sweden

S. Szidat1,2, M. Ruff1,2, N. Perron2, L. Wacker3, H.-A. Synal3, M. Hallquist4, A. S. Shannigrahi4, K. E. Yttri5, C. Dye5, and D. Simpson6,7 S. Szidat et al.
  • 1Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, 3012 Berne, Switzerland
  • 2Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland
  • 3Institute for Particle Physics, ETH Hönggerberg, 8093 Zurich, Switzerland
  • 4Department of Chemistry, Atmospheric Science, University of Gothenburg, 41296 Gothenburg, Sweden
  • 5Norwegian Institute for Air Research, 2027 Kjeller, Norway
  • 6Norwegian Meteorological Institute, 0313 Oslo, Norway
  • 7Radio and Space Science, Chalmers University of Technology, 41296 Gothenburg

Abstract. Particulate matter was collected at an urban site in Göteborg (Sweden) in February/March 2005 and in June/July 2006. Additional samples were collected at a rural site for the winter period. Total carbon (TC) concentrations were 2.1–3.6 μg m−3, 1.8–1.9 μg m−3, and 2.2–3.0 μg m−3 for urban/winter, rural/winter, and urban/summer conditions, respectively. Elemental carbon (EC), organic carbon (OC), water-insoluble OC (WINSOC), and water-soluble OC (WSOC) were analyzed for 14C in order to distinguish fossil from non-fossil emissions. As wood burning is the single major source of non-fossil EC, its contribution can be quantified directly. For non-fossil OC, the wood-burning fraction was determined independently by levoglucosan and 14C analysis and combined using Latin-hypercube sampling (LHS). For the winter period, the relative contribution of EC from wood burning to the total EC was >3 times higher at the rural site compared to the urban site, whereas the absolute concentrations of EC from wood burning were elevated only moderately at the rural compared to the urban site. Thus, the urban site is substantially more influenced by fossil EC emissions. For summer, biogenic emissions dominated OC concentrations most likely due to secondary organic aerosol (SOA) formation. During both seasons, a more pronounced fossil signal was observed for Göteborg than has previously been reported for Zurich, Switzerland. Analysis of air mass origin using back trajectories suggests that the fossil impact was larger when local sources dominated, whereas long-range transport caused an enhanced non-fossil signal. In comparison to other European locations, concentrations of levoglucosan and other monosaccharide anhydrides were low for the urban and the rural site in the area of Göteborg during winter.

Final-revised paper