Particle emission of internal combustion engines under transient load conditions - on-line analysis of particle size and concentration by optical extinction

Zahoransky, Richard; Kuhnt, H.W.; Laile, E.; Poß, G.

doi:10.1016/s0021-8502(98)90685-1

Cited by 2 publications

(1 citation statement)

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“…Fresh diesel (traffic) emissions, which are characterized by high EC (or BC) concentrations, have low apparent densities (below 1 g cm −3 ) mainly due to the agglomerate structure (fractal-like shape) of soot particles – . On the other hand, since the material density of BC is around 2.0 g cm −3 , compactation of soot agglomerates due to, e.g., cloud processing may enhance ρ 2.5 up to 2.0 g cm −3 .…”

Section: Discussionmentioning

confidence: 99%

Seasonal and Diurnal Variation of PM_2.5 Apparent Particle Density in Urban Air in Augsburg, Germany

Pitz

Schmid

Heinrich

et al. 2008

Environ. Sci. Technol.

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The apparent particle density of particulate matter with aerodynamic diameter < 2.5 microm (rho2.5) was determined at an urban site in Augsburg, Germany and its correlation with chemical composition and meteorological conditions was investigated. rho2.5 showed strong day-to-day variation from 1.05 to 2.36 g cm(-3) (5 to 95% percentile), and nearly 64% of the daily variability could be explained by a multiple variable regression model. A minimum in the morning and afternoon (about 1.5 g cm(-3)), and a maximum (near 1.8 g cm(-3)) during midday was observed. The minima represent fresh primary aerosol emissions, which were related to traffic soot particles with low density due to their agglomerate structure, especially observed in the early morning hours of weekdays. The maximum is likely due to increased secondary particle production and the presence of more aged particles with the built-up of the convectively mixed boundary layer. rho2.5 has the potential to serve as a crude tracer for chemical composition and atmospheric processing and might play an important role when considering the associations between health effects and ambient particles.

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Section: Discussionmentioning

confidence: 99%

Seasonal and Diurnal Variation of PM_2.5 Apparent Particle Density in Urban Air in Augsburg, Germany

Pitz

Schmid

Heinrich

et al. 2008

Environ. Sci. Technol.

View full text Add to dashboard Cite

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Optical Multiwavelength Technique Applied to the Online Measurement of Particle Emissions from Engines

Zahoransky

Saier

Laile³

et al. 2001

SAE Technical Paper Series

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Particle emission of internal combustion engines under transient load conditions - on-line analysis of particle size and concentration by optical extinction

Cited by 2 publications

References 1 publication

Seasonal and Diurnal Variation of PM_2.5 Apparent Particle Density in Urban Air in Augsburg, Germany

Seasonal and Diurnal Variation of PM_2.5 Apparent Particle Density in Urban Air in Augsburg, Germany

Optical Multiwavelength Technique Applied to the Online Measurement of Particle Emissions from Engines

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Particle emission of internal combustion engines under transient load conditions - on-line analysis of particle size and concentration by optical extinction

Cited by 2 publications

References 1 publication

Seasonal and Diurnal Variation of PM2.5 Apparent Particle Density in Urban Air in Augsburg, Germany

Seasonal and Diurnal Variation of PM2.5 Apparent Particle Density in Urban Air in Augsburg, Germany

Optical Multiwavelength Technique Applied to the Online Measurement of Particle Emissions from Engines

Contact Info

Product

Resources

About

Seasonal and Diurnal Variation of PM_2.5 Apparent Particle Density in Urban Air in Augsburg, Germany

Seasonal and Diurnal Variation of PM_2.5 Apparent Particle Density in Urban Air in Augsburg, Germany