| Title | Measurement report: Aircraft observations of ozone, nitrogen oxides, and volatile organic compounds over Hebei Province, China |
| Authors | Benish, Sarah E. He, Hao Ren, Xinrong Roberts, Sandra J. Salawitch, Ross J. Li, Zhanqing Wang, Fei Wang, Yuying Zhang, Fang Shao, Min Lu, Sihua Dickerson, Russell R. |
| Affiliation | Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 20742 USA NOAA, Air Resources Lab, College Pk, MD 20740 USA Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA Beijing Normal Univ, Coll Global Change & Earth Syst Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China Chinese Acad Meteorol Sci, Key Lab Cloud Phys, Beijing 100081, Peoples R China Nanjing Univ Informat Sci & Technol, Sch Atmospher Phys, Key Lab Aerosol Cloud Precipitat, China Meteorol Adm, Nanjing 21004, Peoples R China Peking Univ, Coll Environm Sci & Engn, Beijing 100871, Peoples R China |
| Keywords | YANGTZE-RIVER DELTA BIOGENIC ISOPRENE EMISSIONS GROUND-LEVEL OZONE NONMETHANE HYDROCARBONS COMPOUNDS VOCS AIR-QUALITY VERTICAL DISTRIBUTIONS SOURCE APPORTIONMENT TROPOSPHERIC OZONE NORTHERN CHINA |
| Issue Date | 30-Nov-2020 |
| Publisher | ATMOSPHERIC CHEMISTRY AND PHYSICS |
| Abstract | To provide insight into the planetary boundary layer (PBL) production of ozone (O-3) over the North China Plain, the Air chemistry Research in Asia (ARIAs) campaign conducted aircraft measurements of air pollutants over Hebei Province, China, between May and June 2016. We evaluate vertical profiles of trace gas species including O-3, nitrogen oxides (NOx), carbon monoxide (CO), and volatile organic compounds (VOCs) and relate to rates of O-3 production. This analysis shows measured O-3 levels ranged from 45 to 146 ppbv, with the peak median concentration (similar to 92 ppbv) occurring between 1000 and 1500 m. The NOx concentrations exhibited strong spatial and attitudinal variations, with a maximum of 53 ppbv. Ratios of CO/CO2 indicate the prevalence of low-efficiency combustion from biomass burning and residential coal burning but indicate some success of regional pollution controls compared to earlier studies in China. Concentrations of total measured VOCs reveal alkanes dominate the total measured volume mixing ratio of VOCs (68 %), and sources include vehicular emissions, fuel and solvent evaporation, and biomass burning. Alkanes and alkenes/alkynes are responsible for 74 % of the total VOC reactivity assessed by calculating the OH loss rates, while aromatics contribute the most to the total ozone formation potential (OFP) (43 %) with toluene, m/p-xylene, ethylene, propylene, and i -pentane playing significant roles in the aloft production of O-3 in this region. In the PBL below 500 m, box model calculations constrained by measured precursors indicate the peak rate of mean O-3 production was similar to 7 ppbv h(-1). Pollution frequently extended above the PBL into the lower free troposphere around 3000 m, where NO2 mixing ratios (similar to 400 pptv) led to net production rates of O-3 up to similar to 3 ppbvh(-1); this pollution can travel substantial distances downwind. The O-3 sensitivity regime is determined to be NOx-limited throughout the PBL, whereas it is more VOC-limited at low altitudes near urban centers, demonstrating that control of both VOCs and NOx is needed to reduce aloft O-3 pollution over Hebei. |
| URI | http://hdl.handle.net/20.500.11897/601881 |
| ISSN | 1680-7316 |
| DOI | 10.5194/acp-20-14523-2020 |
| Indexed | SCI(E) |
| Appears in Collections: | 环境科学与工程学院 |
