Heterogeneous NOx chemistry in the polluted PBL |
| |
| Affiliation: | 1. CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China;2. University of Chinese Academy of Sciences, Beijing, China;3. CAWAS, Meteorological Observation Center of Chinese Meteorological Administration, Beijing, China;4. Air Quality Research Division, Science and Technology Branch, Environment and Climate Change Canada, Toronto, Canada;5. South China Institute of Environmental Sciences, Ministry of Environmental Protection, Guangzhou, China;6. College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu, China;7. Beijing Weather Modification Office, Beijing, China;1. Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;2. Cooperative Institute for Climate & Satellites, University of Maryland, College Park, MD 20740, USA;3. Center for Spatial Information Science and Systems, George Mason University, Fairfax, VA 22030, USA;4. Beijing Municipal Institute of Labor Protection, Beijing 100054, China;5. State key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;1. State Key laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Chemistry and Chemical Engineering, Cangzhou Normal University, Cangzhou 061001, China |
| |
| Abstract: | The significance of heterogeneous mechanisms in controlling gas-phase NOx (NO, NO2) mixing ratios in polluted urban air, especially during nighttime, is not well established. Several recent studies have suggested that carbon soot can provide an effective surface for mediating the inter conversion among several NOy members. However, a number of such reactions reported in the literature have widely varying reaction probabilities and often conflicting pathways. We evaluated several of these reactions and choose the NO2 conversion to HONO on the surface of soot particles for further analysis with a box photochemical model. These calculations show that the conversion of NO2 to HONO on particle surfaces produces a large, measurable signal (up to several parts per billion) in nighttime HONO mixing ratios. Inclusion of this reaction was also shown to have significant impacts on ozone, OH and HO2 in the polluted planetary boundary layer (PBL). The sensitivity of these results to the different reaction rate probabilities (γ) and particle surface areas was also examined. Results are then evaluated to find the combination of γ and surface areas that would mostly likely occur in the PBL within the limitations of the model. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
