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Chamber studies of visibility-reducing aerosols

Elder, J.C / Ettinger, H.J / Nelson, R.Y

Abstract Interest in light scattering measurements as an index of aerosol mass concentration in the atmosphere and concomitant degradation of visibility prompted a laboratory study to define the ratio of mass concentration to particulate light scattering coefficient ( $M b sp$ ) for several individual aerosols. Simultaneous measurement of b sp with an integrating nephelometer and M with a suitable gravimetric technique provided the basic data. Several size distributions of flyash, coal dust and silica dust were generated under laboratory conditions into a 16 m³ chamber and the resulting $M b sp$ ratio compared on the basis of each aerosol's size characteristics and similar data from field studies performed by others. The $M b sp$ values for the three individual aerosols were larger than those found in previous field studies, probably due to the relatively smaller numbers of particles in the optically active size range. A significant effect of particle size on $M b sp$ was observed for the coal dust test aerosol. $M b sp$ for an 0.70 μm count median dia. aerosol was 2.5 times the $M b sp$ for a 0.33 μm aerosol.

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Chamber studies of visibility-reducing aerosols

Elder, J.C / Ettinger, H.J / Nelson, R.Y

Abstract Interest in light scattering measurements as an index of aerosol mass concentration in the atmosphere and concomitant degradation of visibility prompted a laboratory study to define the ratio of mass concentration to particulate light scattering coefficient ( $M b sp$ ) for several individual aerosols. Simultaneous measurement of b sp with an integrating nephelometer and M with a suitable gravimetric technique provided the basic data. Several size distributions of flyash, coal dust and silica dust were generated under laboratory conditions into a 16 m³ chamber and the resulting $M b sp$ ratio compared on the basis of each aerosol's size characteristics and similar data from field studies performed by others. The $M b sp$ values for the three individual aerosols were larger than those found in previous field studies, probably due to the relatively smaller numbers of particles in the optically active size range. A significant effect of particle size on $M b sp$ was observed for the coal dust test aerosol. $M b sp$ for an 0.70 μm count median dia. aerosol was 2.5 times the $M b sp$ for a 0.33 μm aerosol.

Chamber studies of visibility-reducing aerosols

Elder, J.C / Ettinger, H.J / Nelson, R.Y

Abstract Interest in light scattering measurements as an index of aerosol mass concentration in the atmosphere and concomitant degradation of visibility prompted a laboratory study to define the ratio of mass concentration to particulate light scattering coefficient ( $M b sp$ ) for several individual aerosols. Simultaneous measurement of b sp with an integrating nephelometer and M with a suitable gravimetric technique provided the basic data. Several size distributions of flyash, coal dust and silica dust were generated under laboratory conditions into a 16 m³ chamber and the resulting $M b sp$ ratio compared on the basis of each aerosol's size characteristics and similar data from field studies performed by others. The $M b sp$ values for the three individual aerosols were larger than those found in previous field studies, probably due to the relatively smaller numbers of particles in the optically active size range. A significant effect of particle size on $M b sp$ was observed for the coal dust test aerosol. $M b sp$ for an 0.70 μm count median dia. aerosol was 2.5 times the $M b sp$ for a 0.33 μm aerosol.

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Titel:

Chamber studies of visibility-reducing aerosols

Beteiligte:

Elder, J.C (Autor:in) / Ettinger, H.J (Autor:in) / Nelson, R.Y (Autor:in)

Erschienen in:

Atmospheric Environment ; 8 ; 1035-1048

Erscheinungsdatum:

05.01.1974

Format / Umfang:

14 pages

ISSN:

DOI:

https://doi.org/10.1016/0004-6981(74)90197-8

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Englisch

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