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| Titel |
Atmospheric number size distributions of soot particles and estimation of emission factors |
| VerfasserIn |
D. Rose, B. Wehner, M. Ketzel, C. Engler, J. Voigtländer, T. Tuch, A. Wiedensohler |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 4 ; Nr. 6, no. 4 (2006-03-30), S.1021-1031 |
| Datensatznummer |
250003628
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| Publikation (Nr.) |
 copernicus.org/acp-6-1021-2006.pdf |
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| Zusammenfassung |
| Number fractions of externally mixed particles of four different
sizes (30, 50, 80, and 150 nm in diameter) were measured
using a Volatility Tandem DMA. The system was operated in a street
canyon (Eisenbahnstrasse, EI) and at an urban background site
(Institute for Tropospheric Research, IfT), both in the city of
Leipzig, Germany as well as at a rural site (Melpitz (ME), a
village near Leipzig). Intensive campaigns of 3–5 weeks each took
place in summer 2003 as well as in winter 2003/04. The data set
thus obtained provides mean number fractions of externally mixed
soot particles of atmospheric aerosols in differently polluted
areas and different seasons (e.g. at 80 nm on working days,
60% (EI), 22% (IfT), and 6% (ME) in summer and 26% (IfT), and
13% (ME) in winter). Furthermore, a new method is used to
calculate the size distribution of these externally mixed soot
particles from parallel number size distribution measurements. A
decrease of the externally mixed soot fraction with decreasing
urbanity and a diurnal variation linked to the daily traffic
changes demonstrate, that the traffic emissions have a significant
impact on the soot fraction in urban areas. This influence becomes
less in rural areas, due to atmospheric mixing and transformation
processes. For estimating the source strength of soot particles
emitted by vehicles (veh), soot particle emission factors were
calculated using the Operational Street Pollution Model (OSPM).
The emission factor for an average vehicle was found to be
(1.5±0.4)·1014 #(km·veh). The
separation of the emission factor into passenger cars ((5.8±2)·1013} #(km·veh)) and trucks ((2.5±0.9)·1015 #(km·veh)) yielded in a 40-times
higher emission factor for trucks compared to passenger cars. |
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