Articles | Volume 19, issue 19
Research article
02 Oct 2019
Research article |  | 02 Oct 2019

Relative humidity and O3 concentration as two prerequisites for sulfate formation

Yanhua Fang, Chunxiang Ye, Junxia Wang, Yusheng Wu, Min Hu, Weili Lin, Fanfan Xu, and Tong Zhu

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Cited articles

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Berglen, T. F., Berntsen, T. K., Isaksen, I. S. A., and Sundet, J. K.: A global model of the coupled sulfur/oxidant chemistry in the troposphere: The sulfur cycle, J. Geophys. Res. Atmos., 109, D19310,, 2004. 
Brothers, L. A., Dominguez, G., Abramian, A., Corbin, A., Bluen, B., and Thiemens, M. H.: Optimized low-level liquid scintillation spectroscopy of S-35 for atmospheric and biogeochemical chemistry applications, P. Natl. Acad. Sci. USA, 107, 5311–5316,, 2010. 
Cheng, Y. F., Zheng, G. J., Wei, C., Mu, Q., Zheng, B., Wang, Z. B., Gao, M., Zhang, Q., He, K. B., Carmichael, G., Poschl, U., and Su, H.: Reactive nitrogen chemistry in aerosol water as a source of sulfate during haze events in China, Sci. Adv., 2, e1601530,, 2016. 
Short summary
Year-long observations of PM2.5, gaseous pollutants, and meteorological parameters in Beijing were analysed to investigate sulfate formation. RH and O3 concentrations above thresholds of 45 % and 35 ppb, respectively, greatly accelerated sulfate formation. Ambient changes in RH and O3 contributed to variations in sulfate formation among different seasons and pollution levels. A shift from gas-phase to multiphase SO2 oxidation contributed to fast sulfate formation under polluted conditions.
Final-revised paper