Vertical distribution of aerosol particles and NOx close to a motorway

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Authors
Imhof, D.
Vogt, Ulrich
Dreiseidler, Anja
Rosenbohm, E.
Scheer, Volker
Vogt, Rainer
Nielsen, Ole John
Kurtenbach, Ralf
Corsmeier, Ulrich
Author (Corporation)
Publication date
10/2005
Typ of student thesis
Course of study
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Atmospheric Environment
Special issue
DOI of the original publication
Link
Series
Series number
Volume
39
Issue / Number
31
Pages / Duration
5710-5721
Patent number
Publisher / Publishing institution
Elsevier
Place of publication / Event location
Amsterdam
Edition
Version
Programming language
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Practice partner / Client
Abstract
In May 2001, the large-scale field project BAB II was performed at the highly frequented motorway BAB (Bundesautobahn) A656 with two traffic lanes in each direction between the German cities Heidelberg and Mannheim. Extensive measurements of air pollutants were carried out on both sides of the motorway. In a distance of 60 m (north side) and 84 m (south side) to the traffic lanes, two 52-m-high towers were installed, at which electrically powered elevators were fixed. In these elevators, two NOx analysers, an Electrical Low Pressure Impactor (ELPI; measurement of the particle number size distribution in the diameter range 𝐷 between 30 nm and 10 μm) and a Diffusion Charger (DC; measuring the particle surface area concentration), were operated to record continuous vertical profiles from 5 to 50 m above the earth's surface. On the upwind side, particle number and surface area concentration as well as NOx values were constant over the entire height profile. On the downwind side, increased concentrations appeared in the near-ground range: in the forenoon, a monotonous decrease in pollutant concentrations with increasing height was found, while around noon the concentration maximum of the particles was slightly shifted to 10 m above ground. This height dependence was found for two different size ranges, i.e., for particles with 𝐷<300nm (consisting of soot particles and nucleation mode particles formed by condensation as a result of cooling of the exhaust gas after emission), and for coarse particles (𝐷>1μm, abrasion and resuspension products). In the size range between 300 and 700 nm, no height dependence was found, corroborating the fact that motor traffic emits only few particles in this size range. On the downwind side of the motorway, only background concentrations were measured above 25 m. The results of the profile measurements were confirmed by stationary measurements of particle size distributions with Scanning Mobility Particle Sizers (SMPS) at various heights. A good correlation between particle surface area and NOx concentration was observed. Vehicle emission factors were determined for the particle surface area, number and volume of several size ranges.
Keywords
Subject (DDC)
380 - Handel, Kommunikation, Verkehr
360 - Soziale Probleme, Sozialdienste, Versicherungen
Project
Event
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ISBN
ISSN
1352-2310
0004-6981
Language
English
Created during FHNW affiliation
No
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Closed
License
Citation
IMHOF, D., Ernest WEINGARTNER, Ulrich VOGT, Anja DREISEIDLER, E. ROSENBOHM, Volker SCHEER, Rainer VOGT, Ole John NIELSEN, Ralf KURTENBACH, Ulrich CORSMEIER, M. KOHLER und Urs BALTENSPERGER, 2005. Vertical distribution of aerosol particles and NOx close to a motorway. Atmospheric Environment. Oktober 2005. Bd. 39, Nr. 31, S. 5710–5721. DOI 10.1016/j.atmosenv.2004.07.036. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46767