Aggravating O3 pollution due to NOx emission control in eastern China

Wang, Nan; Lyu, Xiaopu; Deng, Xuejiao; Huang, Xin; Jiang, Fei; Ding, Aijun

doi:10.1016/j.scitotenv.2019.04.388

Cited by 302 publications

(166 citation statements)

References 75 publications

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“…Ozone pollution has been reported frequently and has become a serious issue in China [6,9,11]. Currently, most of the research has focused on anthropogenic and biogenic emitted ozone precursors from the surface [7,8,12], while the stratospheric ozone intrusion, another important source of tropospheric ozone, has been less studied. A recent study poses the question of to what extent do the SI events influence the surface ozone at relatively lower latitudes, that is, in eastern China [40].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…Ozone pollution episodes have been reported frequently in eastern China, and ozone pollution is now a serious issue in China [6,7,9]. Surface ozone is related to complex photochemical reactions involving anthropogenic and biogenic emitted volatile organic compounds (VOCs) and nitrogen oxides (NOx) [10][11][12]. While the anthropogenic emitted NOx decreased significantly due to government control and the VOCs emissions changed little [7,8,12], the exact reason for elevated ozone and frequently occurring ozone pollution episodes in eastern China are still not clear.…”

Section: Introductionmentioning

confidence: 99%

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A Stratospheric Intrusion-Influenced Ozone Pollution Episode Associated with an Intense Horizontal-Trough Event

Wang

2020

Atmosphere

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Ozone pollution is currently a serious issue in China. As an important source of tropospheric ozone, the stratospheric ozone has received less concern. This study uses a combination of ground-based ozone measurements, the latest ERA5 reanalysis data as well as chemistry-climate model and Lagrangian Particle Dispersion Modeling (LPDM) simulations to investigate the potential impacts of stratospheric intrusion (SI) on surface ozone pollution episodes in eastern China. Station-based observations indicate that severe ozone pollution occurred from 27 April to 28 April 2018 in eastern China, with maximal values over 140 ppbv. ERA5 meteorological and ozone data suggest that a strong horizontal-trough exists at the same time, which leads to an evident SI event and brings ozone-rich air from the stratosphere to the troposphere. Using a stratospheric ozone tracer defined by NCAR’s Community Atmosphere Model with Chemistry (CAM-Chem), we conclude that this SI event contributed about 15 ppbv (15%) to the surface ozone pollution episode during 27–28 April in eastern China. The potential impacts of SI events on surface ozone variations should be therefore considered in ozone forecast and control.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Stratospheric Intrusion-Influenced Ozone Pollution Episode Associated with an Intense Horizontal-Trough Event

Wang

2020

Atmosphere

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“…A review of 20 years of air pollution control measures in Beijing reported a reduction in NOx and VOCs during the period 2013-2017 (UN Environment 2019). Other studies have also shown that the precursors of ozone have decreased in recent years in eastern China (Ma et al, 2016;van der A et al, 2017;Li et al, 2017;Wang et al, 2019). This is considered to be the main reason for the hiatus in the increase in ozone in the troposphere, especially in the lower troposphere.…”

Section: Discussionmentioning

confidence: 92%

“…A clear decreasing trend in NOx emissions has been observed since 2012(van der A et al, 2017) Zheng et al (2018). reported that emissions of NOx in China decreased by 21% during the time period 2013-2017 Wang et al (2019). reported that NOx emissions in eastern China decreased by ∼25% from 2012 to 2016.Even if a massive reduction in the precursors of tropospheric ozone results 155…”

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confidence: 99%

Long-term Variations in Ozone Levels in the Troposphere and Lower Stratosphere over Beijing: Observations and Model Simulations

Zhang¹,

Tao²,

Liu³

et al. 2020

Preprint

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<p><strong>Abstract.</strong> Tropospheric ozone is both a major pollutant and a short-lived greenhouse gas and has therefore attracted much concern in recent years. The ozone profile in the troposphere and lower stratosphere over Beijing has been observed since 2002 by ozonesondes developed by the Institute of Atmospheric Physics. Increasing concentrations of tropospheric ozone from 2002 to 2010 measured by these balloon-based observations have been reported previously. As more observations are now available, we used these data to analyze the long-term variability of ozone over Beijing during the whole period from 2002 to 2018. The ozonesondes measured increasing concentrations of ozone from 2002 to 2012 in both the troposphere and lower stratosphere. There was a sudden decrease in observed ozone between 2011 and 2012. After this decrease, the increasing trend in ozone concentrations slowed down, especially in the mid-troposphere, where the positive trend became neutral. We used the Chemical Lagrangian Model of the Stratosphere (CLaMS) to determine the influence of the transport of ozone from the stratosphere to the troposphere on the observed ozone profiles. CLaMS showed a weak increase in the contribution of stratospheric ozone before the decrease in 2011&#8211;2012 and a much more pronounced decrease after this time. Because there is no tropospheric chemistry in CLaMS, the sudden decrease simulated by CLaMS indicates that a smaller downward transport of ozone from the stratosphere after 2012 may explain a significant part of the observed decrease in ozone in the mid-troposphere and lower stratosphere. However, the influence of stratospheric ozone in the lower troposphere is negligible in CLaMS and the hiatus in the positive trend after 2012 can be attributed to a reduction in ozone precursors as a result of stronger pollution control measures in Beijing.</p>

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“…Exposure to excessive NO x can result in diseases in the short term, and even death in the long term [41]. Besides, NO x can lead to the generation of PM 2.5 and O 3 by reacting with other elements in the atmosphere [42,43]. It also contributes to the formation of acid rain [44,45], which brings damage to the ecosystem and society.…”

Section: Introductionmentioning

confidence: 99%

Spatial Correlation of Industrial NOx Emission in China’s 2 + 26 Policy Region: Based on Social Network Analysis

et al. 2020

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The Chinese government has identified air pollution transmission points in Beijing-Tianjin-Hebei region and its surrounding areas under 2 + 26 initiative. This study introduces a modified Gravity Model to construct the spatial correlation network of industrial NO x in 2 + 26 policy region from 2011 to 2015, and further explores network characteristics and socioeconomic factors of this spatial correlation network by Social Network Analysis. Results indicate significant correlation of industrial NO x emission in 2 + 26 policy cities. The spatial correlation network of industrial NO x has remained stable within 5 years, implying no pollution exacerbation of interregional transmission. According to the effect of output and input in the correlation network of industrial NO x , cities in 2 + 26 policy region can be categorized into four types: high-high, high-low, low-low, and low-high, as each should adopt the corresponding strategies for emission reduction. Shijiazhuang, Liaocheng, Cangzhou, Heze and Handan should be key monitored during implementation of emission reduction. Taiyuan, Hebi, Langfang, Tangshan and Yangquan, should give priority to local emission reduction although less associated with other cities, based on city type and current emission situation. Environmental regulation and geographical distance have significant influence on the spatial correlation network of industrial NO x , of which the indicator of environmental regulation difference matrix has become significantly negative since 2014, while the indicator of geographical effect has been significantly positive all along. Urban industrial emission has significant correlation between cities with distance of 0-300 km, while no significant correlation between cities with distance exceeding 300 km.

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Aggravating O3 pollution due to NOx emission control in eastern China

Cited by 302 publications

References 75 publications

A Stratospheric Intrusion-Influenced Ozone Pollution Episode Associated with an Intense Horizontal-Trough Event

A Stratospheric Intrusion-Influenced Ozone Pollution Episode Associated with an Intense Horizontal-Trough Event

Long-term Variations in Ozone Levels in the Troposphere and Lower Stratosphere over Beijing: Observations and Model Simulations

Spatial Correlation of Industrial NOx Emission in China’s 2 + 26 Policy Region: Based on Social Network Analysis

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