Ground-Based and Airborne Measurements of Nonmethane Hydrocarbons in BERLIOZ: Analysis and Selected Results

摘要: During the Berlin Ozone Experiment BERLIOZ in July–August 1998 quasi-continuous measurements ofC2–C12 nonmethane hydrocarbons (NMHCs) were carried out at 10 sites and around city of using on-line gas-chromatographic systems (GCs) with a temporal resolution 20–120 minutes. Additional airborne NMHCmeasurements made canister sampling on three aircraft an GC system fourth aircraft. The ground based data are analyzed to characterize different identify influence emissions from its surroundings. Benzene mixing ratios 4 rural rather low (<0.5 ppbv). (and surrounding highway ring) was identified as main source anthropogenic NMHCs Eichstadt Blossin, whilst other sources important furthermost site Menz. median toluene/benzene concentration ratio 2.3 ppbv/ppbv, agreeing well German cities. As expected, background decreased increasing distance usually one or below. On 20 21 July, northwesterly situated downwind thus influenced by emissions. Considering between windspeed, plume observed reasonable time scales, showing decreasing 2.3, 1.6 1.3 Berlin. Isoprene only biogenic NMHC measured BERLIOZ. It themost abundant compound hotter days, dominating local reactivity averaged contributions total OH loss rate 51% 70% Pabstthum respectively. Emissionratios (relative CO sum analysed NMHCs) derived measurements. comparison emission inventory suggests traffic-related be predominating considered hydrocarbon species. Problems for propane, ethene pentanes.