Yi Chen, Suzhen Chi, Yaru Wang, Shuzheng Guo, Chong Zhang, Chunxiang Ye, Weili Lin
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引用次数: 0
Abstract
As Lhasa experiences accelerated urbanization and increased pollutant emission intensity, controlling ozone pollution becomes more challenging due to increased photochemical reactions—a problem exacerbated by the city’s already high solar UV radiation and background ozone levels. In order to reveals the intricacies of ozone formation, this study conducted direct ozone production rate (OPR) measurements in Lhasa in June 2021, comparing them to findings in Beijing in similar climatic conditions. Despite lower NOx levels, Lhasa exhibited a higher OPR with reduced variations (12.8 ± 6.0 ppbv h-1) due to stronger UVR and OH reactivity (VOC-kOH) influenced by oxidized volatile organic compounds when compared to Beijing (9.4 ± 11.0 ppbv h-1). When adjusting for comparable UVR conditions, Lhasa demonstrated a less pronounced NO turning point in OPR compared to Beijing. Lhasa’s unique bridge-shaped VOC-kOH diel variation favored daytime peroxy radical production, pushing the NO turning point higher from morning to noon, resulting in a NOx-limited regime except in the early morning. Furthermore, the accumulation of OVOCs in the Lhasa River valley, coupled with rapid photochemical production despite relatively low VOCs emissions, explained the elevated VOC-kOH levels. This suggests that OVOCs and, consequently, O3 pollution could worsen with future VOCs emission increases, possibly triggered by factors like rapid warming and local afforestation initiatives. Our findings highlight the complex and sensitive nature of O3 pollution in Lhasa and other Tibetan Plateau cities, emphasizing the need for continued monitoring and in-depth research to develop effective control strategies.
期刊介绍:
Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health.
It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes.
International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals.
Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements.
This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.