Particle growth with photochemical age from new particle formation to haze in the winter of Beijing, China

The Science of the Total Environment
Biwu ChuM Kulmala

Abstract

Secondary aerosol formation in the aging process of primary emission is the main reason for haze pollution in eastern China. Pollution evolution with photochemical age was studied for the first time at a comprehensive field observation station during winter in Beijing. The photochemical age was used as an estimate of the timescale attributed to the aging process and was estimated from the ratio of toluene to benzene in this study. A low photochemical age indicates a fresh emission. The photochemical age of air masses during new particle formation (NPF) days was lower than that on haze days. In general, the strongest NPF events, along with a peak of the formation rate of 1.5 nm (J1.5) and 3 nm particles (J3), were observed when the photochemical age was between 12 and 24 h while rarely took place with photochemical ages less than 12 h. When photochemical age was larger than 48 h, haze occurred and NPF was suppressed. The sources and sinks of nanoparticles had distinct relation with the photochemical age. Our results show that the condensation sink (CS) showed a valley with photochemical ages ranging from 12 to 24 h, while H2SO4 concentration showed no obvious trend with the photochemical age. The high concentrations of precursor...Continue Reading

References

Aug 18, 2012·Nature Protocols·Markku KulmalaVeli-Matti Kerminen
Nov 26, 2014·Proceedings of the National Academy of Sciences of the United States of America·Song GuoRenyi Zhang
Aug 25, 2015·The Science of the Total Environment·Liwei WangQingzhu Zhang
Oct 23, 2015·Nature·Markku Kulmala
Feb 24, 2016·Journal of Environmental Sciences (China)·Biwu ChuXinming Wang

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