East Asian SO 2 pollution plume over Europe – Part 1: Airborne trace gas measurements and source identification by particle dispersion model simulations

摘要: Abstract. 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 German research Falcon, were part INTEX-B (Intercontinental Chemical Transport Experiment-B) campaign. Additional trace gases (NO, NOy, CO, H2O) measured and used for comparison source identification. atmospheric SO2 mole fraction markedly increased inside reached up to 900 pmol/mol. Accompanying lagrangian FLEXPART particle dispersion model simulations indicate that probed originated low altitudes from densely populated industrialized regions Asia, primarily China, about 8–12 days prior measurements.