East Asian SO2 pollution plume over Europe – Part 1: Airborne trace gas measurements and source identification by particle dispersion model simulations 1Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, 82234 Wessling, Germany
2Max-Planck Institute for Nuclear Physics, (MPIK), Atmospheric Physics Division, P.O. Box 103980, 69029 Heidelberg, Germany
3Norwegian Institute for Air Research (NILU), Dept. Regional and Global Pollution Issues, Kjeller, Norway
Received: 17 Nov 2008 – Published in Atmos. Chem. Phys. Discuss.: 15 Jan 2009 – Published: 20 Jul 2009Abstract. A large SO2-rich pollution plume of East Asian origin was detected by aircraft based CIMS (Chemical Ionization Mass Spectrometry)
measurements at 3–7.5 km altitude over the North Atlantic. The measurements, which took place on 3 May 2006 aboard of the German
research aircraft Falcon, were part of the INTEX-B (Intercontinental Chemical Transport Experiment-B)
campaign. Additional trace gases (NO, NOy, CO, H2O) were measured and used for comparison and source identification. The
atmospheric SO2 mole fraction was markedly increased inside the plume and reached up to 900 pmol/mol. Accompanying lagrangian
FLEXPART particle dispersion model simulations indicate that the probed pollution plume originated at low altitudes from densely
populated and industrialized regions of East Asia, primarily China, about 8–12 days prior to the measurements.
Citation: Fiedler, V., Nau, R., Ludmann, S., Arnold, F., Schlager, H., and Stohl, A.: East Asian SO2 pollution plume over Europe – Part 1: Airborne trace gas measurements and source identification by particle dispersion model simulations, Atmos. Chem. Phys., 9, 4717-4728, doi:10.5194/acp-9-4717-2009, 2009.