A multivariate statistical analysis of visibility degradation at four California cities

Barone, J.B.; Cahill, Thomas A.; Eldred, Robert A.; Flocchini, Robert G.; Shadoan, D.J.; Dietz, Thomas

doi:10.1016/0004-6981(78)90177-4

Cited by 30 publications

(8 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Samples were collected in a slotted rotating drum impactor (Lundgren 1967), a technique in which the UC Davis Air Quality Group and DELTA Group have specialized for the past 30 years (some examples are in Cahill et al 1974Cahill et al , 1981Cahill et al , 1989Flocchini et al 1976;Feeney et al 1975;Barone et al 1978;Flocchini et al 1981;Reid et al 1994;and summarized in Cahill and Wakabayshi 1993) totaling almost 17,000 site days of sampling and analysis, most recently in international studies of aerosol transport (Reid et al 1993;Perry et al 1997Perry et al , 1999 including the large study, ACE-Asia 2001. The present version, an 8 stage rotating drum impactor called a DRUM (Davis Rotatingdrum Unit for Monitoring) was developed (Cahill et al 1985;Raabe et al 1988), modified (O.…”

Section: Sample Collectionmentioning

confidence: 99%

Analysis of Aerosols from the World Trade Center Collapse Site, New York, October 2 to October 30, 2001

Cahill

Cliff

Perry

et al. 2004

Aerosol Science and Technology

View full text Add to dashboard Cite

The collapse of the World Trade Center (WTC) buildings #2 (South Tower), #1 (North Tower), and #7 created an enormous collapse pile which emitted intense plumes of acrid smoke and dust until roughly mid-December, when the last spontaneous surface fire occurred. We collected particles by size (8 modes, ≈12 to 0.09 micrometers diameter) and time (typical resolution of 1 to 3 h) from October 2 until late December at the EML 201 Varick Street site roughly 1.8 km NNE of the collapse site and 50 m above ground level. Here we show some of the 70,000 mass and elemental data from the time period October 2 through October 30. Identification of a WTC collapse pile source for aerosols seen at the receptor site were based upon the simultaneous presence of finely powdered concrete, gypsum, and glass with intense very fine combustion mode mass episodes concurrent with winds from the southwest

show abstract

Section: Sample Collectionmentioning

confidence: 99%

Analysis of Aerosols from the World Trade Center Collapse Site, New York, October 2 to October 30, 2001

Cahill

Cliff

Perry

et al. 2004

Aerosol Science and Technology

View full text Add to dashboard Cite

show abstract

“…One approach involves using compositional characteristics of sources to identify their contribution to the ambient particle loading. 18 This technique was used to specify "Soil," "Sulfate," and "Automotive" source categories. The equations used to calculate the contribution by these sources (discussed below) are in Table IV.…”

Section: Source Characterizationmentioning

confidence: 99%

Lake Tahoe Visibility Study

Pitchford¹,

Allison²

1984

Journal of the Air Pollution Control Association

View full text Add to dashboard Cite

“…It is a complex process with many factors involved including concentrations, size distributions, and composition of aerosol particles as well as meteorological conditions (Watson, 2002). Numbers of studies focused on the connection between visibility and air pollutants by statistical methods (White and Roberts, 1977;Barone et al, 1978;Sloane et al, 1991;Sequeira and Lai, 1998;Kuo et al, 2013). Increasing evidence shows that elevated concentrations of fine particulate matter (aerodynamic diameter ≤ 2.5 µm, PM 2.5 ) are the main cause of visibility degradation in urban areas, because fine particles scatter visible light more efficiently than coarse particles (e.g., Ferman et al, 1981;Pitchford, 1982;Malm, 1989;Yuan et al, 2006;Deng et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Reconstructed Light Extinction Coefficients of Fine Particulate Matter in Rural Guangzhou, Southern China

Chen

Lai

Gao

et al. 2016

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

A one-year campaign was conducted to collected PM 2.5 samples in the rural area of Guangzhou, the largest megacity in South China, from March 2012 to February 2013. Mass concentration of PM 2.5 , carbonaceous fractions (i.e., organic carbon (OC) and elemental carbon (EC)) and 6 water-soluble ions were analyzed. Light extinction coefficient (b ext ) of fine particulate matter was reconstructed using the revised IMPROVE formula at the site. (NH 4 ) 2 SO 4 (AS) made a dominant contribution to the light extinction budget, accounting for 61.3% (155.6 ± 108.5 Mm -1 ) annually, with highest in autumn (68.0%) and lowest in winter (55.2%). Organic matter (OM) was the second largest contributor accounting for 20.5% (52.2 ± 42.7 Mm -1 ) with highest in winter (23.4%) and lowest in spring (18.0%). The relationship between reconstructed b ext and measured b ext was investigated under the influence of seasonality, visibility and PM 2.5 concentration. We found that b ext could be reconstructed using revised IMPROVE formula in high PM 2.5 days (threshold value of ~60 µg m -3 ). On other hand, the performance of formula was unsatisfactory for b ext reconstruction of in low PM 2.5 days, when meteorological conditions could have significant impact on visibility.

show abstract

A multivariate statistical analysis of visibility degradation at four California cities

Cited by 30 publications

References 17 publications

Analysis of Aerosols from the World Trade Center Collapse Site, New York, October 2 to October 30, 2001

Analysis of Aerosols from the World Trade Center Collapse Site, New York, October 2 to October 30, 2001

Lake Tahoe Visibility Study

Reconstructed Light Extinction Coefficients of Fine Particulate Matter in Rural Guangzhou, Southern China

Contact Info

Product

Resources

About