Optical Properties of Secondary Organic Aerosol Produced by Photooxidation of Naphthalene under NOx Condition
Quanfu He, Chunlin Li, Kyla Siemens, Ana C. Morales, Anusha P. S. Hettiyadura, Alexander Laskin, Yinon Rudich
Abstract
) produced under higher NOx conditions contribute significantly to the light absorption of the SOA. The imaginary part of the RI linearly increases with the NOx/VOCs ratio due to the formation of nitroaromatic compounds. As a function of aging, the imaginary RI increases with the O/C ratio (slope = 0.024), mainly attributed to the achieved higher NOx/VOCs ratio, which favors the formation of light-absorbing nitroaromatics. The light-absorbing enhancement is not as significant with extensive aging as it is under a lower aging time due to the opening of aromatic rings by reactions.
Topics & Concepts
AerosolNOxNaphthaleneEnvironmental chemistryEnvironmental scienceChemistryPhotochemistryOrganic chemistryCombustionAtmospheric chemistry and aerosolsAtmospheric Ozone and ClimateAtmospheric aerosols and clouds