Temporal characteristics of carbon dioxide and ozone over a rural-cropland area in the Yangtze River Delta of eastern China

Duan, Zexia; Yang, Yibo; Wang, Linlin; Liu, Changwei; Fan, Shuai; Chen, Chen; Tong, Yingxiang; Lin, Xinfeng; Gao, Zhiqiu

doi:10.1016/j.scitotenv.2020.143750

Cited by 21 publications

(19 citation statements)

References 45 publications

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“…The areas with O 3 concentration exceeding the limit of Chinese national ambient air quality standards were mainly in the southwest suburbs of Shanghai, and the atmospheric O 3 concentration decreased from the southwest suburb to the northeast urban areas. It was reported that the tropospheric O 3 pollution in the Yangtze River Delta region was more serious in Shanghai, Ningbo and other cities [28]. It should be noted that the concentrations of near-ground-surface O 3 in Shanghai, Hangzhou, Hefei and Nanjing in the Yangtze River Delta region have increased slightly during the past 10 years (from 2005 to 2014), but the increase degree was smaller than that in the Beijing-Tianjin-Hebei region.…”

Section: Spatiotemporal Distribution Of Tropospheric Ozone In Chinamentioning

confidence: 91%

Review on Atmospheric Ozone Pollution in China: Formation, Spatiotemporal Distribution, Precursors and Affecting Factors

Lin

Zou

et al. 2021

Atmosphere

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In recent years, atmospheric ozone pollution has become more and more serious in many areas of China due to the rapid development of industrialization and urbanization. The increase in atmospheric ozone concentration will not only cause harm to the human respiratory tract, nervous system and immune system, but also cause obvious harm to crops, which will lead to reductions in crop production. Therefore, the study of atmospheric ozone pollution should not be ignored in research on the atmospheric environment. In this paper, we summarized the formation mechanisms of atmospheric ozone, the spatiotemporal distribution characteristics of atmospheric ozone in some areas of China, the relationship between atmospheric ozone and its precursors, and the main factors affecting the concentration of atmospheric ozone. Then, the control countermeasures against atmospheric ozone pollution were put forward in combination with the actual situation in China.

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Section: Spatiotemporal Distribution Of Tropospheric Ozone In Chinamentioning

confidence: 91%

Review on Atmospheric Ozone Pollution in China: Formation, Spatiotemporal Distribution, Precursors and Affecting Factors

Lin

Zou

et al. 2021

Atmosphere

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“…This was because the generation and elimination of O3 was related to several factors, such as solar radiation [74,75], NOx concentration and VOC concentration [76,77], and was also influenced by non-local sources [78,79]. The wind rose figure for the combined pollutant concentrations is widely used to determine the directions and characteristics of the pollutants [80,81]. Figures S5-S9 in the Supplementary Materials show the wind rose figures of the TVOC, O3, OFP, PM2.5 and SOAP, which were used to investigate the VOC contributions in the OFP and SOAP from different directions.…”

Section: Estimation Of Vocs In the Ofp And Soapmentioning

confidence: 99%

“…The distributions of areas with high SOAP values (Figure S9) and areas with high PM2.5 concentrations were similar in all seasons except for winter (the area with a high PM2.5 concentration was in the northwest direction), when the difference between the distributions was larger. This indicated The wind rose figure for the combined pollutant concentrations is widely used to determine the directions and characteristics of the pollutants [80,81]. Figures S5-S9 in the Supplementary Materials show the wind rose figures of the TVOC, O 3 , OFP, PM 2.5 and SOAP, which were used to investigate the VOC contributions in the OFP and SOAP from different directions.…”

Section: Estimation Of Vocs In the Ofp And Soapmentioning

confidence: 99%

Characteristics and Sources of Volatile Organic Compounds in the Nanjing Industrial Area

Feng

Tang

et al. 2022

Atmosphere

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In this study, 56 volatile organic compounds species (VOCs) and other pollutants (NO, NO2, SO2, O3, CO and PM2.5) were measured in the northern suburbs of Nanjing from September 2014 to August 2015. The total volatile organic compound (TVOC) concentrations were higher in the autumn (40.6 ± 23.8 ppbv) and winter (41.1 ± 21.7 ppbv) and alkanes were the most abundant species among the VOCs (18.4 ± 10.0 ppbv). According to the positive matrix factorization (PMF) model, the VOCs were found to be from seven sources in the northern suburbs of Nanjing, including liquefied petroleum gas (LPG) sources, gasoline vehicle emissions, iron and steel industry sources, industrial refining coke sources, solvent sources and petrochemical industry sources. One of the sources was influenced by seasonal variations: it was a diesel vehicle emission source in the spring, while it was a coal combustion source in the winter. According to the conditional probability function (CPF) method, it was found that the main contribution areas of each source were located in the easterly direction (mainly residential areas, industrial areas, major traffic routes, etc.). There were also seasonal differences in concentration, ozone formation potential (OFP), OH radical loss rate (LOH) and secondary organic aerosols potential (SOAP) for each source due to the high volatility of the summer and autumn temperatures, while combustion increases in the winter. Finally, the time series of O3 and OFP was compared to that PM2.5 and SOAP and then they were combined with the wind rose figure. It was found that O3 corresponded poorly to the OFP, while PM2.5 corresponded well to the SOAP. The reason for this was that the O3 generation was influenced by several factors (NOx concentration, solar radiation and non-local transport), among which the influence of non-local transport could not be ignored.

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“…This is related to the formation mechanism of ozone. Many studies showed that under sufficient light, volatile organic compounds (VOCs) and nitrogen oxides (NOx) underwent a photochemical reaction to generate O 3 and at the same time produced secondary pollutants in the atmosphere [46][47][48]. High temperature, strong ultraviolet and high photochemical reaction rate were common phenomena in Sichuan Basin during spring and summer.…”

Section: Seasonal Variations Of Pollutantsmentioning

confidence: 99%

Research on the Temporal and Spatial Characteristics of Air Pollutants in Sichuan Basin

et al. 2021

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Sichuan Basin is one of the most densely populated areas in China and the world. Human activities have great impact on the air quality. In order to understand the characteristics of overall air pollutants in Sichuan Basin in recent years, we analyzed the concentrations of six air pollutants monitored in 22 cities during the period from January 2015 to December 2020. During the study period, the annual average concentrations of CO, NO2, SO2, PM2.5 and PM10 all showed a clear downward trend, while the ozone concentration was slowly increasing. The spatial patterns of CO and SO2 were similar. High-concentration areas were mainly located in the western plateau of Sichuan Basin, while the concentrations of NO2 and particulate matter were more prominent in the urban agglomerations inside the basin. During the study period, changes of the monthly average concentrations for pollutants (except for O3) conformed to the U-shaped pattern, with the highest in winter and the lowest in summer. In the southern cities of the basin, secondary sources had a higher contribution to the generation of fine particulate matter, while in large cities inside the basin, such as Chengdu and Chongqing, air pollution had a strong correlation with automobile exhaust emissions. The heavy pollution incidents observed in the winter of 2017 were mainly caused by the surrounding plateau terrain with typical stagnant weather conditions. This finding was also supported by the backward trajectory analysis, which showed that the air masses arrived in Chengdu were mainly from the western plateau area of the basin. The results of this study will provide a basis for the government to take measures to improve the air quality in Sichuan Basin.

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Temporal characteristics of carbon dioxide and ozone over a rural-cropland area in the Yangtze River Delta of eastern China

Cited by 21 publications

References 45 publications

Review on Atmospheric Ozone Pollution in China: Formation, Spatiotemporal Distribution, Precursors and Affecting Factors

Review on Atmospheric Ozone Pollution in China: Formation, Spatiotemporal Distribution, Precursors and Affecting Factors

Characteristics and Sources of Volatile Organic Compounds in the Nanjing Industrial Area

Research on the Temporal and Spatial Characteristics of Air Pollutants in Sichuan Basin

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