@article {24924,
	title = {No Evidence for a Significant Impact of Heterogeneous Chemistry on Radical Concentrations in the North China Plain in Summer 2014},
	journal = {Environmental Science \&amp; Technology},
	volume = {54},
	number = {10},
	year = {2020},
	note = {Lt6agTimes Cited:0Cited References Count:39},
	month = {May 19},
	pages = {5973-5979},
	abstract = {The oxidation of nitric oxide to nitrogen dioxide by hydroperoxy (HO2) and organic peroxy radicals (RO2) is responsible for the chemical net ozone production in the troposphere and for the regeneration of hydroxyl radicals, the most important oxidant in the atmosphere. In Summer 2014, a field campaign was conducted in the North China Plain, where increasingly severe ozone pollution has been experienced in the last years. Chemical conditions in the campaign were representative for this area. Radical and trace gas concentrations were measured, allowing for calculating the turnover rates of gas-phase radical reactions. Therefor; the importance of heterogeneous HO(2 )uptake on aerosol could be experimentally determined. HO2 uptake could have suppressed ozone formation at that time because of the competition with gas-phase reactions that produce ozone. The successful reduction of the aerosol load in the North China Plain in the last years could have led to a significant decrease of HO2 loss on particles, so that ozone-forming reactions could have gained importance in the last years. However, the analysis of the measured radical budget in this campaign shows that HO2 aerosol uptake did not impact radical chemistry for chemical conditions in 2014. Therefore, reduced HO2 uptake on aerosol since then is likely not the reason for the increasing number of ozone pollution events in the North China Plain, contradicting conclusions made from model calculations reported in the literature.},
	keywords = {atmosphere, ho2 radicals, nitryl chloride, oh, oxidation, pearl river delta, pollution, rural site wangdu, surface ozone concentrations, uptake coefficients},
	isbn = {0013-936x},
	author = {Tan, Z. F. and Hofzumahaus, A. and Lu, K. D. and Brown, S. S. and Holland, F. and Huey, L. G. and Kiendler-Scharr, A. and X. Li and Liu, X. X. and Ma, N. and Min, K. E. and Rohrer, F. and Shao, M. and Wahner, A. and Wang, Y. H. and Wiedensohler, A. and Y.S. Wu and ZJ Wu and L.M. Zeng and Zhang, Y. H. and Fuchs, H.}
}
