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Titolo:
FINE PARTICULATE CHEMICAL-COMPOSITION AND LIGHT EXTINCTION AT CANYONLANDS NATIONAL-PARK USING ORGANIC PARTICULATE MATERIAL CONCENTRATIONS OBTAINED WITH A MULTISYSTEM, MULTICHANNEL DIFFUSION DENUDER SAMPLER
Autore:
EATOUGH DJ; EATOUGH DA; LEWIS L; LEWIS EA;
Indirizzi:
BRIGHAM YOUNG UNIV,DEPT CHEM PROVO UT 84602
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
fascicolo: D14, volume: 101, anno: 1996,
pagine: 19515 - 19531
Fonte:
ISI
Lingua:
ENG
Soggetto:
RELATIVE-HUMIDITY; SIZE DISTRIBUTION; UNITED-STATES; SCATTERING; PARTICLES; AEROSOLS; SYSTEM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Eatough et al., "FINE PARTICULATE CHEMICAL-COMPOSITION AND LIGHT EXTINCTION AT CANYONLANDS NATIONAL-PARK USING ORGANIC PARTICULATE MATERIAL CONCENTRATIONS OBTAINED WITH A MULTISYSTEM, MULTICHANNEL DIFFUSION DENUDER SAMPLER", JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 101(D14), 1996, pp. 19515-19531

Abstract

The concentration of fine particulate carbonaceous material has been measured over a 1-year period at the Interagency Monitoring of Protected Visual Environments (IMPROVE) Canyonlands National Park, Utah sampling site using a Brigham Young University organic sampling system (BOSS) multisystem, multichannel diffusion denuder sampler. Samples were collected on the IMPROVE schedule of a 24-hour sample every Wednesday and Saturday. The concentrations of particulate C, determined using only a quartz filter pack sampling system, were low by an average of 39%,as a result of the loss of semi-volatile organic compounds from the particles collected on quartz filters during sampling. The loss was higher during the summer than during the winter sampling periods. The BOSS and IMPROVE quartz filter carbon measurements were in agreement except for a few samples collected during the summer. The fine particulatecarbonaceous material concentrations determined using the BOSS have been combined with concentrations of particulate elemental C (soot), sulfate, nitrate, crustal material, and fine and coarse particulate massfrom the IMPROVE sampling system, as well as relative humidity, lightabsorption, and transmissometer measurements of light extinction fromIMPROVE. Extinction budgets have been calculated using multilinear regression analyses of the data set. Literature data were used to estimate the change in the mass extinction coefficients for the measured species as a function of relative humidity. The results show carbonaceousmaterial to be the principal contributor to light extinction due to particles during the study period, with the major contributor to light extinction being light-absorbing carbonaceous material. However, the periods of maximum light extinction are associated with high humidity and the associated increased scattering of light due to particulate sulfate during the winter. The effect of particulate organic compounds onlight extinction is greatest in the summer and smallest in the winter.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 07:44:17