Details zur Publikation |
Kategorie | Textpublikation |
Referenztyp | Zeitschriften |
DOI | 10.5194/acp-9-2355-2009 |
Titel (primär) | Dispersion of traffic-related exhaust particles near the Berlin urban motorway - estimation of fleet emission factors |
Autor | Birmili, W.; Alaviippola, B.; Hinneburg, D.; Knoth, O.; Tuch, T.; Borken-Kleefeld, J.; Schacht, A. |
Quelle | Atmospheric Chemistry and Physics |
Erscheinungsjahr | 2009 |
Department | STUDIEN |
Band/Volume | 9 |
Heft | 7 |
Seite von | 2355 |
Seite bis | 2374 |
Sprache | englisch |
Abstract | Atmospheric particle number size distributions of airborne particles (diameter range 10-500 nm) were collected over ten weeks at three sites in the vicinity of the A100 urban motorway in Berlin, Germany. The A100 carries about 180 000 vehicles on a weekday. The roadside particle distributions showed a number maximum between 20 and 60 nm clearly related to the motorway emissions. The average total number concentration at roadside was 28 000 cm(-3) with a total range of 1200-168 000 cm(-3). At distances of 80 and 400m from the motorway the concentrations decreased to mean levels of 11 000 and 9000 cm(-3), respectively. An obstacle-resolving dispersion model was applied to simulate the 3-D flow field and traffic tracer transport in the urban environment around the motorway. By inverse modelling, vehicle emission factors were derived that are representative of a fleet with a relative share of 6% lorry-like vehicles, and driving at a speed of 80 km h(-1). Three different calculation approaches were compared, which differ in the choice of the experimental winds driving the flow simulation. The average emission factor per vehicle was 2.1 (+/- 0.2) . 10(14) km(-1) for particle number and 0.077 (+/- 0.01) . 10(14) cm(3) km(-1) for particle volume. Regression analysis suggested that lorry-like vehicles emit 123 (+/- 28) times more particle number than passenger car-like vehicles, and lorry-like vehicles account for about 91% of particulate number emissions on weekdays. Our work highlights the increasing applicability of 3-D flow models in urban microscale environments and their usefulness for determining traffic emission factors |
dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=66 |
Birmili, W., Alaviippola, B., Hinneburg, D., Knoth, O., Tuch, T., Borken-Kleefeld, J., Schacht, A. (2009): Dispersion of traffic-related exhaust particles near the Berlin urban motorway - estimation of fleet emission factors Atmos. Chem. Phys. 9 (7), 2355 - 2374 10.5194/acp-9-2355-2009 |