Understanding the optical properties of ambient sub-and supermicron particulate matter: Results from the CARES 2010 field study in northern California

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Atmospheric Chemistry and Physics, ISSN: 1680-7324, Vol: 16, Issue: 10, Page: 6511-6535

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https://works.bepress.com/dean_atkinson/12; https://pdxscholar.library.pdx.edu/chem_fac/125
Cappa, Christopher D.; Kolesar, Katheryn R.; Zhang, Xiaolu; Atkinson, Dean B.; Pekour, Mikhail S.; Zaveri, Rahul A.; Zelenyuk, Alla; Zhang, Qi
Copernicus GmbH
Earth and Planetary Sciences; Photochemistry; Particle size distribution; Particulate matter; Carbonaceous aouserosols; Light absorption; Chemistry
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article description
Measurements of the optical properties (absorption, scattering and extinction) of PM1, PMand PMmade at two sites around Sacramento, CA, during the June 2010 Carbonaceous Aerosols and Radiative Effects Study (CARES) are reported. These observations are used to establish relationships between various intensive optical properties and to derive information about the dependence of the optical properties on photochemical aging and sources. Supermicron particles contributed substantially to the total light scattering at both sites, about 50 % on average. A strong, linear relationship is observed between the scattering Ångström exponent for PMand the fraction of the scattering that is contributed by submicron particles (f, PMlevelCombining double low line 4 1) at both sites and with similar slopes and intercepts (for a given pair of wavelengths), suggesting that the derived relationship may be generally applicable for understanding variations in particle size distributions from remote sensing measurements. At the more urban T0 site, the fsca, PM