Details:

Journal Title:
Atmospheric Chemistry and Physics
Personal Author:
Liu, T. ; Wang, X. ; Hu, Q. ; Deng, W. ; Zhang, Y. ; ... More +
Liu, T. ; Wang, X. ; Hu, Q. ; Deng, W. ; Zhang, Y. ; Ding, X. ; Fu, X. ; Bernard, F. ; Zhang, Z. ; Lü, S. ; He, Q. ; Bi, X. ; Chen, J. ; Sun, Y. ; Yu, J. ; Peng, P. ; Sheng, G. ; Fu, J. Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research) ; CSD (Chemical Sciences Division) ; ESRL (Earth System Research Laboratory)
OAR (Oceanic and Atmospheric Research) ; CSD (Chemical Sciences Division) ; ESRL (Earth System Research Laboratory) Less -
Description:
Sulfur dioxide (SO2) can enhance the formation of secondary aerosols from biogenic volatile organic compounds (VOCs), but its influence on secondary aerosol formation from anthropogenic VOCs, particularly complex mixtures like vehicle exhaust, remains uncertain. Gasoline vehicle exhaust (GVE) and SO2, a typical pollutant from coal burning, are directly co-introduced into a smog chamber, in this study, to investigate the formation of secondary organic aerosols (SOA) and sulfate aerosols through photooxidation. New particle formation was enhanced, while substantial sulfate was formed through the oxidation of SO2 in the presence of high concentration of SO2. Homogenous oxidation by OH radicals contributed a negligible fraction to the conversion of SO2 to sulfate, and instead the oxidation by stabilized Criegee intermediates (sCIs), formed from alkenes in the exhaust reacting with ozone, dominated the conversion of SO2. After 5 h of photochemical aging, GVE's SOA production factor revealed an increase by 60-200% in the presence of high concentration of SO2 . The increase could principally be attributed to acid-catalyzed SOA formation as evidenced by the strong positive linear correlation (R-2 = 0 : 97) between the SOA production factor and in situ particle acidity calculated by the AIM-II model. A high-resolution time-of-flight aerosol mass spectrometer (HR-TOF-AMS) resolved OA's relatively lower oxygen-to-carbon (O:C)(0.44 +/- 0.02) and higher hydrogen-to-carbon (H:C) (1.40 +/- 0.03) molar ratios for the GVE/SO2 mixture, with a significantly lower estimated average carbon oxidation state (OSc) of -0.51 +/- 0.06 than -0.19 +/- 0.08 for GVE alone. The relative higher mass loading of OA in the experiments with SO2 might be a significant explanation for the lower SOA oxidation degree.
Source:
Atmospheric Chemistry and Physics, 16(2), 675-689.
DOI:
https://doi.org/10.5194/acp-16-675-2016
Document Type:
Journal Article
Rights Information:
CC BY
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:a3dd80f906784e846cdc18640f20510e4765fe578a53966277d2368acfa0b8e7
Download URL:
https://repository.library.noaa.gov/view/noaa/21722/noaa_21722_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +