Measurements of Volatile Organic Compounds During the COVID‐19 Lockdown in Changzhou, China

Jensen, Andrew; Liu, Zhiqiang; Tan, Wen; Dix, B.; Chen, Tianshu; Koss, A.; Zhu, Liang; Li, Li; Gouw, J. A. de

doi:10.1029/2021gl095560

Cited by 18 publications

(14 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A result was unprecedented decreases in Northern Hemisphere (NH) pollution including important ozone precursors nitrogen oxides (NO x = nitric oxide [NO] + nitrogen dioxide [NO 2 ]) and Volatile Organic Compounds (VOCs). The decreases in pollution and subsequent changes in tropospheric ozone, particularly in the NH, has led to a large number of published articles on this subject (e.g., Bauwens et al., 2020 ; Bouarar et al., 2021 ; Bray et al., 2021 ; Campbell et al., 2021 ; Elshorbany et al., 2021 ; Jensen et al., 2021 ; Keller et al., 2021 ; Liu et al., 2020 ; Miyazaki et al., 2021 ; Pakkattil et al., 2021 ; Sicard et al., 2020 ; Stavrakou et al., 2021 ; Steinbrecht et al., 2021 ). These studies have shown numerous cases of large reductions in NO 2 , VOCs, and other pollutants in the troposphere including free‐tropospheric ozone during spring‐summer 2020 that reached 5%–10% deficits or greater throughout the NH, particularly in urban environments.…”

Section: Introductionmentioning

confidence: 99%

“…Jensen et al. ( 2021 ) identified pollution reductions of 40%–60% for industry and about 70% for traffic over China in early 2020 using TROPOMI and ground‐based measurements. Miyazaki et al.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Jensen et al. ( 2021 ) found 40%–70% anthropogenic reductions in VOCs in early spring 2020 in Changzhou, China. Pakkattil et al.…”

Section: Introductionmentioning

confidence: 99%

“…For VOCs, studies also report large reductions in the NH in 2020. For example, Jensen et al (2021) found 40%-70% anthropogenic reductions in VOCs in early spring 2020 in Changzhou, China. Pakkattil et al (2021) used ground measurements to show drops in VOCs in early spring 2020 over major metropolitan cities in India, with up to 82% reductions in the first phase of spring-time lockdown compared to pre-lockdown.…”

mentioning

confidence: 99%

“…Bauwens et al (2020), using TROPOMI and the Ozone Monitoring Instrument (OMI) satellite measurements, identified large drops in NO 2 in early 2020 varying from 20% to 40% relative to the pre-COVID-19 time period over the US, western Europe, South Korea and China. Jensen et al (2021) identified pollution reductions of 40%-60% for industry and about 70% for traffic over China in early 2020 using TROPOMI and ground-based measurements. Miyazaki et al (2021), using a chemical data assimilation system, identified drops of 15% in global NO x with up to 25% regional drops in NO x for April-May 2020.…”

mentioning

confidence: 99%

See 4 more Smart Citations

NASA Satellite Measurements Show Global‐Scale Reductions in Free Tropospheric Ozone in 2020 and Again in 2021 During COVID‐19

Ziemke

Kramarova

Frith

et al. 2022

Geophysical Research Letters

View full text Add to dashboard Cite

In early 2020, soon after the beginning of the global COronaVIrus Disease 2019 (COVID-19) pandemic, extensive international efforts were taken in attempt to reduce the spread of the virus. These efforts included lockdowns and reduced activities of many private and public businesses, schools, and travel. A result was unprecedented decreases in Northern Hemisphere (NH) pollution including important ozone precursors nitrogen oxides (NO x = nitric oxide [NO] + nitrogen dioxide [NO 2 ]) and Volatile Organic Compounds (VOCs). The decreases in pollution and subsequent changes in tropospheric ozone, particularly in the NH, has led to a large number of published articles on this subject (e.g.,

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…For example, Jensen et al. ( 2021 ) found 40%–70% anthropogenic reductions in VOCs in early spring 2020 in Changzhou, China. Pakkattil et al.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

NASA Satellite Measurements Show Global‐Scale Reductions in Free Tropospheric Ozone in 2020 and Again in 2021 During COVID‐19

Ziemke

Kramarova

Frith

et al. 2022

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

The impact of COVID-19 lockdown on ozone budget and radical chemistry in a typical industrial city of China

Cui

Wang

2022

Preprint

View full text Add to dashboard Cite

Ozone (O 3 ) levels in East China suffered from rapid increases during the COVID-19 period. To clarify the reason for the O 3 increase, a continuous campaign was performed in a industrial city in North China Plain (NCP). Meanwhile, the machinelearning technique and the box model were employed to reveal the mechanisms of O 3 increase from the perspective of meteorology and photochemical process, respectively. The result suggested that the ambient O 3 level in Tangshan increased from 18.7 ± 4.63 to 45.6 ± 8.52 μg/m 3 (143%) after COVID-19 lockdown, and the emission reduction and meteorology contributed to 77% and 66% of this increment, respectively. The higher Wind speed (WS) coupled with regional transport played a significant role on O 3 increase (30.8 kg/s). The O 3 sensitivity verified that O 3 production was highly volatile organic compounds (VOC)-sensitive (Relative incremental reactivity (RIR): 0.75), while the NOx showed the negative impact on O 3 production in Tangshan (RIR:-0.59). It suggested that the control of VOCs rather than NOx might be more effective in reducing O 3 level in Tangshan because it was located on the VOC-limited regime. Besides, both of ozone formation potential (OFP) analysis and observation-based model (OBM) demonstrated that the alkenes (36.3 ppb) and anthropogenic oxygenated volatile organic compounds (OVOCs) (15.2 ppb) showed the higher OFP compared with other species, and their reactions released a large number of HO 2 and RO 2 radicals. Moreover, the concentrations of these species did not experience marked decreases after COVID-19 lockdown, which were major contributors to O 3 increase during this period.

show abstract

The impact of COVID-19 lockdown on ozone budget and radical chemistry in a typical industrial city of China

Cui

Wang

2023

Preprint

View full text Add to dashboard Cite

Ozone (O) levels in East China suffered from rapid increases during the COVID-19 period. To clarify the reason for the O increase, a continuous campaign was performed in a industrial city in North China Plain (NCP). Meanwhile, the machine-learning technique and the box model were employed to reveal the mechanisms of O increase from the perspective of meteorology and photochemical process, respectively. The result suggested that the ambient O level in Tangshan increased from 18.7 ± 4.63 to 45.6 ± 8.52 μg/m (143%) after COVID-19 lockdown, and the emission reduction and meteorology contributed to 77% and 66% of this increment, respectively. The higher Wind speed (WS) coupled with regional transport played a significant role on O increase (30.8 kg/s). The O sensitivity verified that O production was highly volatile organic compounds (VOC)-sensitive (Relative incremental reactivity (RIR): 0.75), while the NO showed the negative impact on O production in Tangshan (RIR: -0.59). It suggested that the control of VOCs rather than NO might be more effective in reducing O level in Tangshan because it was located on the VOC-limited regime. Besides, both of ozone formation potential (OFP) analysis and observation-based model (OBM) demonstrated that the alkenes (36.3 ppb) and anthropogenic oxygenated volatile organic compounds (OVOCs) (15.2 ppb) showed the higher OFP compared with other species, and their reactions released a large number of HO and RO radicals. Moreover, the concentrations of these species did not experience marked decreases after COVID-19 lockdown, which were major contributors to O increase during this period.

show abstract

Measurements of Volatile Organic Compounds During the COVID‐19 Lockdown in Changzhou, China

Cited by 18 publications

References 46 publications

NASA Satellite Measurements Show Global‐Scale Reductions in Free Tropospheric Ozone in 2020 and Again in 2021 During COVID‐19

NASA Satellite Measurements Show Global‐Scale Reductions in Free Tropospheric Ozone in 2020 and Again in 2021 During COVID‐19

The impact of COVID-19 lockdown on ozone budget and radical chemistry in a typical industrial city of China

The impact of COVID-19 lockdown on ozone budget and radical chemistry in a typical industrial city of China

Contact Info

Product

Resources

About