Review of aircraft measurements over China: aerosol, atmospheric photochemistry, and cloud

Quan, Jiannong; Jia, Xingcan

doi:10.1016/j.atmosres.2020.104972

Cited by 9 publications

(3 citation statements)

References 147 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tremendous efforts have been made to characterize air pollutants in populated urban areas in China (Li et al, 2017;Wang et al, 2017;Quan and Jia, 2020). In most studies, stationary measurements were conducted to obtain the temporal variations of air pollutants for the analysis of the sources and formation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of air pollutants in a megacity characterized by mobile measurements

et al. 2022

View full text Add to dashboard Cite

Abstract. Characterization of the spatial distributions of air pollutants on an intracity scale is important for understanding local sources, secondary formation, and human exposure. In this study, we conducted in situ mobile measurements for the chemical composition of fine particles, volatile organic compounds (VOCs), oxygenated VOCs (OVOCs), and common gas pollutants in winter in the megacity of Beijing. The spatial patterns of these pollutants under different pollution conditions were investigated. During the non-haze days all pollutants showed significant spatial variability. Large spatial variations of secondary species including OVOCs and secondary aerosol species highlight the chemical heterogeneity. In particular, the inorganic chemical composition of fine particles varied greatly on the 65 km urban highway, suggesting a wide range of particle neutralization in the megacity of Beijing. Localized sources such as vehicle, cooking, and industrial emissions led to hot spots and nonuniform distributions of primary pollutants in the city. The spatial heterogeneity of air pollutants under less polluted conditions calls for a future need of using fine-resolution models to evaluate human exposure and to develop pollution control strategies. During the haze day the spatial variabilities of secondary gaseous and particulate pollutants were largely reduced, explained by both the elevated urban background of the polluted air mass and the enhanced secondary formation by elevated precursor concentrations and heterogeneous or aqueous pathways. Although localized primary emissions were accumulated under stagnant haze conditions, the chemical composition of fine particles became relatively homogeneous because of the predominant secondary contributions. A uniform spatial pattern of particle neutralization was observed. The concentrations of hydrocarbons and less oxygenated OVOCs showed good positive spatiotemporal correlations during the haze day, while the concentrations of more oxygenated OVOCs showed good positive correlations among themselves but moderate negative correlations with the concentrations of hydrocarbons, less oxygenated OVOCs, and aerosol species. Our results indicate a spatial chemical homogeneity on the megacity scale to promote efficient secondary organic aerosol (SOA) production under haze conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Spatial variability of air pollutants in a megacity characterized by mobile measurements

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Atmospheric fine and coarse particulate matter (PM 2.5 and PM 2.5–10 ) have adverse effects on human health, 1–3 ecosystem sustainability, 4–6 visibility, 7,8 and climate, 9–11 depending on their aerodynamic size and chemical composition. 12 Therefore, the proper choice of sampling and analyzing methods of PM is mostly subject to the chemical composition to be identified (elemental spectrum), the need to keep the samples for further analysis (destructive or non-destructive applications), and also the concentration ranges.…”

Section: Introductionmentioning

confidence: 99%

Comparative elemental characterization of atmospheric fine and coarse PM samples by PIXE and ICP-MS/MS: results from a one-year measurement campaign in a coal-powered thermal power plant city

Dawood

Lucarelli

Arı

et al. 2022

J. Anal. At. Spectrom.

View full text Add to dashboard Cite

show abstract

“…Tremendous efforts have been made to characterize air pollutants in populated urban areas in China (Li et al, 2017;Quan and Jia, 2020). In most studies, stationary measurements were conducted to obtain temporal variations of pollutants for the analysis of sources and formation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of air pollutants in a megacity characterized by mobile measurements: Chemical homogeneity under haze conditions

Khuzestani

Liao

Chen

et al. 2021

Preprint

View full text Add to dashboard Cite

Abstract. Characterization of the spatial distributions of air pollutants on an intracity scale is important for understanding localized sources, secondary formation, and human exposure. In this study, we conducted in situ mobile measurements for the chemical composition of fine particles, volatile organic compounds (VOCs), oxygenated VOCs (OVOCs), and common gas pollutants in winter in the megacity of Beijing. The spatial variations of these gaseous and particulate pollutants under different pollution conditions are investigated. During the less-polluted periods, a large spatial variability exists in the inorganic composition of fine particles, suggesting a wide range of particle neutralization in Beijing. Significant spatial variations are also observed in the composition of organic aerosol (OA), which is mainly driven by local emissions of primary OA from vehicle and cooking exhaust. The spatial variations of VOCs and OVOCs vary by species. In general, hydrocarbon compounds show a large spatial variability driven by traffic emissions, while secondary OVOCs are more spatially homogeneous in concentration. Other gas pollutants show relatively low spatial variabilities, although hot spots of concentration frequently appear which are plausibly caused by high-emitting plumes as well as fast on-road ozone titration. During the haze periods, the spatial variabilities of air pollutants are largely reduced because of the contribution of regional transport. Hydrocarbons and less-oxygenated OVOCs show good positive spatial-temporal correlations in concentration. More-oxygenated OVOCs show good positive correlations among themselves and moderate negative correlations with hydrocarbons, less-oxygenated OVOCs, and particulate components. The results highlight the potential role of chemical homogeneity on the SOA production in the megacity under haze conditions. On the other hand, the spatial heterogeneity of air pollution calls a future need of using fine-resolution models to evaluate human exposure and pollution control strategies.

show abstract

Review of aircraft measurements over China: aerosol, atmospheric photochemistry, and cloud

Cited by 9 publications

References 147 publications

Spatial variability of air pollutants in a megacity characterized by mobile measurements

Spatial variability of air pollutants in a megacity characterized by mobile measurements

Comparative elemental characterization of atmospheric fine and coarse PM samples by PIXE and ICP-MS/MS: results from a one-year measurement campaign in a coal-powered thermal power plant city

Spatial variability of air pollutants in a megacity characterized by mobile measurements: Chemical homogeneity under haze conditions

Contact Info

Product

Resources

About