Spatial and temporal changes of the ozone sensitivity in China based
on satellite and ground-based observations

Wang, Wannan; A, Ronald van der; Ding, Jieying; Weele, M. van; Cheng, Tianhai

doi:10.5194/acp-2020-1097

Cited by 9 publications

(10 citation statements)

References 78 publications

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“…The ozone sensitivity to the concentrations of VOCs and NO x is complex and nonlinear (Kroll et al., 2020), and it can be defined by the ratio of HCHO to NO 2 (FNR). An FNR smaller than 2.3 indicates the VOC‐limited regime, an FNR higher than 4.2 indicates the NOx‐limited regime, and the FNR between 2.3 and 4.2 reflects the transition between the two regimes (Wang et al., 2021). At low NOx concentrations, the O 3 formation varies linearly with NOx and is independent of VOC concentration, referred to as the NOx‐limited regime.…”

Section: Discussionmentioning

confidence: 99%

Reduction in Anthropogenic Emissions Suppressed New Particle Formation and Growth: Insights From the COVID‐19 Lockdown

2022

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To control the spread of the novel 2019 Coronavirus (COVID‐19), the Government of India enforced nationwide social and transportation restrictions (lockdown) in three phases from the evening of 24 March to 31 May 2020, which resulted in a significant reduction of primary emissions. Here, we performed the analyses of particle number size distribution measurements in the particle size range of 1.2–3 nm and 10–514 nm carried out from 15 April to 31 May 2020 (lockdown, LCD) and compared with measurements from the previous year during the same time period (15 April to 31 May 2019, business‐as‐usual, BAU) at University of Hyderabad in Hyderabad, India. The number concentrations of sub‐3 nm particles were comparable between LCD and BAU, but the number concentrations of particles greater than 10 nm diameter were lower by about 85% during LCD than BAU. It indicates that the reduction in primary anthropogenic emissions did not inhibit the formation of sub‐3 nm particles. But the frequency of occurrence of the new particle formation and growth (NPF&G) events was three‐fold lower during LCD than BAU. The ratio of formaldehyde to nitrogen dioxide indicated that India falls in a NOx‐limited regime, which reduces ambient ozone concentrations (lower condensable vapors via ozone oxidation of volatile organic compounds). Besides, the lower temperature (lower hydroxyl radical concentration) and lower wind speed during LCD may have contributed to the suppression of NPF&G events. Therefore, we emphasize the need to account for processes and interactions related to NPF&G in formulating particulate pollution mitigation policies in urban environments.

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Section: Discussionmentioning

confidence: 99%

Reduction in Anthropogenic Emissions Suppressed New Particle Formation and Growth: Insights From the COVID‐19 Lockdown

2022

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“…The EMBE model is evaluated at different time scales (weekly to annual). This work is important because VOCs, which can be of anthropogenic and biogenic origin, play an important role in the oxidizing capacity of the atmosphere and thus in chemical reactions involving O 3 and NOx [49,50]. VOCs are also important precursors for the secondary formation of aerosol particles [51].…”

Section: Introductionmentioning

confidence: 99%

Air Quality over China

Leeuw

Bai

et al. 2021

Remote Sensing

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The strong economic growth in China in recent decades, together with meteorological factors, has resulted in serious air pollution problems, in particular over large industrialized areas with high population density. To reduce the concentrations of pollutants, air pollution control policies have been successfully implemented, resulting in the gradual decrease of air pollution in China during the last decade, as evidenced from both satellite and ground-based measurements. The aims of the Dragon 4 project “Air quality over China” were the determination of trends in the concentrations of aerosols and trace gases, quantification of emissions using a top-down approach and gain a better understanding of the sources, transport and underlying processes contributing to air pollution. This was achieved through (a) satellite observations of trace gases and aerosols to study the temporal and spatial variability of air pollutants; (b) derivation of trace gas emissions from satellite observations to study sources of air pollution and improve air quality modeling; and (c) study effects of haze on air quality. In these studies, the satellite observations are complemented with ground-based observations and modeling.

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“…For regions that are projected to have lower NO x emissions in SSP3-7.0-lowNTCF, such as eastern China, we note that O 3 mixing ratios increase in both winter and summer. The industrial regions of China are in VOC-limited regimes throughout the year, and thus decreased NO x emissions increase O 3 mixing ratios (Jin and Holloway, 2015;Wang et al, 2021;Liu et al, 2021). This suggests that reductions in both NO x and VOC emissions may be needed to reduce O 3 in these regions.…”

Section: Tropospheric O 3 Changesmentioning

confidence: 99%

Tropospheric ozone changes and ozone sensitivity from the present day to the future under shared socio-economic pathways

et al. 2022

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Abstract. Tropospheric ozone is important to future air quality and climate. We investigate ozone changes and ozone sensitivity to changing emissions in the context of climate change from the present day (2004–2014) to the future (2045–2055) under a range of shared socio-economic pathways (SSPs). We apply the United Kingdom Earth System Model, UKESM1, with an extended chemistry scheme including more reactive volatile organic compounds (VOCs) to quantify ozone burdens as well as ozone sensitivities globally and regionally based on nitrogen oxide (NOx) and VOC mixing ratios. We show that the tropospheric ozone burden increases by 4 % under a development pathway with higher NOx and VOC emissions (SSP3-7.0) but decreases by 7 % under the same pathway if NOx and VOC emissions are reduced (SSP3-7.0-lowNTCF) and by 5 % if atmospheric methane (CH4) mixing ratios are reduced (SSP3-7.0-lowCH4). Global mean surface ozone mixing ratios are reduced by 3–5 ppb under SSP3-7.0-lowNTCF and by 2–3 ppb under SSP3-7.0-lowCH4. However, surface ozone changes vary substantially by season in high-emission regions under future pathways, with decreased ozone mixing ratios in summer and increased ozone mixing ratios in winter when NOx emissions are reduced. VOC-limited areas are more extensive in winter (7 %) than in summer (3 %) across the globe. North America, Europe, and East Asia are the dominant VOC-limited regions in the present day, but North America and Europe become more NOx-limited in the future mainly due to reductions in NOx emissions. The impacts of VOC emissions on ozone sensitivity are limited in North America and Europe because reduced anthropogenic VOC emissions are partly offset by higher biogenic VOC emissions. Ozone sensitivity is not greatly influenced by changing CH4 mixing ratios. South Asia becomes the dominant VOC-limited region under future pathways. We highlight that reductions in NOx emissions are required to transform ozone production from VOC to NOx limitation, but that these lead to increased ozone mixing ratios in high-emission regions, and hence emission controls on VOC and CH4 are also necessary.

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Spatial and temporal changes of the ozone sensitivity in China based on satellite and ground-based observations

Cited by 9 publications

References 78 publications

Reduction in Anthropogenic Emissions Suppressed New Particle Formation and Growth: Insights From the COVID‐19 Lockdown

Reduction in Anthropogenic Emissions Suppressed New Particle Formation and Growth: Insights From the COVID‐19 Lockdown

Air Quality over China

Tropospheric ozone changes and ozone sensitivity from the present day to the future under shared socio-economic pathways

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