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Humic acid in ice: Photo-enhanced conversion of nitrogen dioxide into nitrous acid |
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| Authors: | Thorsten Bartels-Rausch Marcello Brigante Yasin F. Elshorbany Markus Ammann Barbara D'Anna Christian George Konrad Stemmler Marieme Ndour Jörg Kleffmann |
| Affiliation: | 1. CNR - Institute of Atmospheric Pollution Research, Via Salaria Km 29.3, CP10, 00015 Monterotondo S., Rome, Italy;2. Research Consortium CORAM, Via Cristoforo Colombo 37/E, 441000 Ferrara, Italy;3. State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, No.5 Yiheyuan Road Haidian District, 100871, Beijing, China |
| Abstract: | Laboratory studies on the heterogeneous conversion of nitrogen dioxide into nitrous acid on irradiated ice films containing humic acid are described. It was found that the presence of light in the visible range of the solar spectrum significantly enhances the rate of nitrous acid release from a humic acid doped ice film. This process might contribute to observed HONO production in snow, where the NO2 is thought to originate from nitrate photolysis. Analysis of the experimental data based on the Langmuir Hinshelwood model framework allowed quantification of the observed dependencies of the nitrous acid production rate on nitrogen dioxide concentration. The observed dependencies on the humic acid concentration as well as on the irradiation intensity were used to estimate light-driven HONO fluxes for environmental snow covers. |
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