ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-11907-2012 Measurement of overall uptake coefficients for HO<sub>2</sub> radicals by aerosol particles sampled from ambient air at Mts. Tai and Mang (China) Taketani F. 1 Kanaya Y. 1 Pochanart P. 1 Liu Y. 1 2 Li J. 1 2 Okuzawa K. 3 Kawamura K. 3 Wang Z. 2 Akimoto H. 1 4 Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohoma, Kanagawa 236-0001, Japan Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China Institute of Low Temperature Science, Hokkaido University, N19 W8, Kita-ku, Sapporo 060-0819, Japan Asia Center for Air Pollution Research, Japan Environment Sanitation Center, 1182 Sowa, Nishi-ku, Niigata 950-2144, Japan 17 12 2012 12 24 11907 11916 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/11907/2012/acp-12-11907-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/11907/2012/acp-12-11907-2012.pdf

HO<sub>2</sub> uptake coefficients for ambient aerosol particles, collected on quartz fiber filter using a high-volume air sampler in China, were measured using an aerosol flow tube coupled with a chemical conversion/laser-induced fluorescence technique at 760 Torr and 298 K, with a relative humidity of 75%. Aerosol particles were regenerated with an atomizer using the water extracts from the aerosol particles. Over 10 samples, the measured HO<sub>2</sub> uptake coefficients for the aerosol particles at the Mt. Tai site were ranged from 0.13 to 0.34, while those at the Mt. Mang site were in the range of 0.09–0.40. These values are generally larger than those previously reported for single-component particles, suggesting that reactions with the minor components such as metal ions and organics in the particle could contribute to the HO<sub>2</sub> uptake. A box model calculation suggested that the heterogeneous loss of HO<sub>2</sub> by ambient particles could significantly affect atmospheric HO<sub>x</sub> concentrations and chemistry.

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