Review status: this preprint was under review for the journal ACP but the revision was not accepted.
Characteristics, sources and formation of aerosol oxalate in an Eastern Asia megacity and its implication to haze pollution
Y. Jiang1,G. Zhuang1,Q. Wang1,T. Liu1,K. Huang1,2,J. S. Fu2,J. Li1,Y. Lin1,R. Zhang1,and C. Deng1Y. Jiang et al.Y. Jiang1,G. Zhuang1,Q. Wang1,T. Liu1,K. Huang1,2,J. S. Fu2,J. Li1,Y. Lin1,R. Zhang1,and C. Deng1
Received: 15 Jul 2011 – Accepted for review: 28 Jul 2011 – Discussion started: 04 Aug 2011
Abstract. A total of 238 samples of PM2.5 and TSP were analyzed to study the characteristics, sources, and formation pathways of aerosol oxalate in Shanghai in four seasons of 2007. The concentrations of oxalate were 0.07–0.41 μg m−3 in PM2.5 and 0.10–0.48 μg m−3 in TSP, respectively. Oxalate displayed a seasonal variation of autumn>summer>winter>spring in both PM2.5 and TSP and was dominantly present in PM2.5 in all samples. Correlation between oxalate and K+ and high ratio of oxalate/K+ suggested that biomass burning was a secondary source of aerosol oxalate in Shanghai, in addition to urban VOCs sources (vehicular and industrial emissions), especially in autumn. Secondary formation accounted for the majority of aerosol oxalate in Shanghai, which was supported by the high correlation of oxalate with nss-SO42−, K+ and NO3−, proceeding from different mechanisms. Relatively high ambient RH together with high cloud cover was found benefiting the secondary formation of aerosol oxalate. The in-cloud process (aqueous-phase oxidation) was proposed to be likely the major formation pathway of aerosol oxalate in Shanghai, which was supported by the high correlation of oxalate with nss-SO42− and K+ , dominant residence of oxalate in droplet mode and result of favorable meteorological condition analysis. High correlation of oxalate and NO3− reflected the OH radical involved oxidation chemistry of the two species in the atmosphere and also suggested that gas-particle surface reactions and evaporation-condensation process were both possible secondary formation pathways of aerosol oxalate in coarser particle mode (>1.0 μm). Aerosol oxalate contributed to the haze pollution and visibility degradation of the local environment. As a major water-soluble organic compound in aerosols, concentration of oxalate showed a distinct negative correlation to the atmospheric visibility, which implied that aerosol organic compounds could play an important role in air quality in Shanghai.
How to cite. Jiang, Y., Zhuang, G., Wang, Q., Liu, T., Huang, K., Fu, J. S., Li, J., Lin, Y., Zhang, R., and Deng, C.: Characteristics, sources and formation of aerosol oxalate in an Eastern Asia megacity and its implication to haze pollution, Atmos. Chem. Phys. Discuss., 11, 22075–22112, https://doi.org/10.5194/acpd-11-22075-2011, 2011.