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