Characterizations of ozone, NOx, and VOCs measured in Shanghai, China

Geng, Feng; Tie, Xuexi; Xu, Jing; Zhou, Guangqiang; P, Li; Gao, Wei; Tang, Xiangru; Zhao, Chunsheng

doi:10.1016/j.atmosenv.2008.05.045

Cited by 217 publications

(123 citation statements)

References 14 publications

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“…Enhanced surface O 3 concentrations were found over rural areas of Shanghai compared to the city center (Geng et al, 2008;Xing et al, 2011). This probably resulted from the significant contribution of anthropogenic emissions of NO in the city center, which consumes ambient ozone through NO titration (i.e., NO+O 3 → NO 2 +O 2 ).…”

Section: Ozone Vertical Distributionmentioning

confidence: 95%

“…VOCs are the important precursors for the O 3 formation in urban areas (Kleinman et al, 2001;Zhang et al, 2004;Geng et al, 2007). Previous studies show that the formation of surface O 3 is mainly under a VOC-sensitive regime in Shanghai (Geng et al, 2008). The production of O 3 is not only due to the abundance of VOCs but also related to the reactions with OH radicals and solar irradiance.…”

Section: O 3 -No 2 -Hcho In Verticalmentioning

confidence: 99%

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Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

et al. 2017

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Abstract. Ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) and lidar measurements were performed in Shanghai, China, during May 2016 to investigate the vertical distribution of summertime atmospheric pollutants. In this study, vertical profiles of aerosol extinction coefficient, nitrogen dioxide (NO 2 ) and formaldehyde (HCHO) concentrations were retrieved from MAX-DOAS measurements using the Heidelberg Profile (HEIPRO) algorithm, while vertical distribution of ozone (O 3 ) was obtained from an ozone lidar. Sensitivity study of the MAX-DOAS aerosol profile retrieval shows that the a priori aerosol profile shape has significant influences on the aerosol profile retrieval. Aerosol profiles retrieved from MAX-DOAS measurements with Gaussian a priori profile demonstrate the best agreements with simultaneous lidar measurements and vehicle-based tethered-balloon observations among all a priori aerosol profiles. Tropospheric NO 2 vertical column densities (VCDs) measured with MAX-DOAS show a good agreement with OMI satellite observations with a Pearson correlation coefficient (R) of 0.95. In addition, measurements of the O 3 vertical distribution indicate that the ozone productions do not only occur at surface level but also at higher altitudes (about 1.1 km). Planetary boundary layer (PBL) height and horizontal and vertical wind field information were integrated to discuss the ozone formation at upper altitudes. The results reveal that enhanced ozone concentrations at ground level and upper altitudes are not directly related to horizontal and vertical transportation. Similar patterns of O 3 and HCHO vertical distributions were observed during this campaign, which implies that the ozone productions near the surface and at higher alPublished by Copernicus Publications on behalf of the European Geosciences Union.

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Section: Ozone Vertical Distributionmentioning

confidence: 95%

Section: O 3 -No 2 -Hcho In Verticalmentioning

confidence: 99%

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

et al. 2017

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“…In addition, VOCs characterized by their photochemical activity could undergo a series of photochemical reaction to form the secondary organic aerosol, which is one of the major components of airborne fine particles. Some studies show that the dominated precursors of smog in big cities are VOCs [17,18]. Related research indicates that ozone formation in Guangzhou urban area is greatly affected by the anthropogenic VOCs and photochemical smog pollution in the Pear River Delta caused by ground-level ozone is becoming worse [19].…”

mentioning

confidence: 99%

Characterization and assessment of volatile organic compounds (VOCs) emissions from typical industries

et al. 2013

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VOCs play an increasingly important role in affecting air quality and threatening human health in China in recent years, where industry activities show a significant contribution to VOCs emission. In this article we report our long term study of industrial VOCs emissions of six major industries (vehicle manufacturing, printing, equipment coating, electronic manufacturing, furniture manufacturing and bio-pharming) on the aspects of emission characteristics, environmental impact and health risk assessment, and control challenge analysis with the purpose to obtain in-depth understanding of industry VOCs emissions and offer some original basements for national control and management of industry VOCs emissions. This study shows that all these industries give middle or low emission with total VOCs concentration less than 1000 mg/m 3 at each exhaust pipe. Benzenes, esters, alcohols, ketones, alkanes, chloroalkanes and alkenes were detected as the major emission components and the most frequently monitored VOCs were benzenes, which varied obviously with different processes and industries. The environmental impact assessments indicate that vehicle manufacturing and benzenes should be prior controlled with the purpose to reduce air pollution. While, health risk assessments suggest that furniture manufacturing and chloroalkanes should be firstly controlled. Control analysis indicates that developing technologies with low cost and high efficiency and establishing and completing specific industry emission standards/regulations are the two key issues in VOCs emission management at present stage.

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“…도시 중심 지 역은 외곽 지역보다 NO 2 농도가 높고 O 3 농도가 낮은 데 이는 NO x (NO + NO 2 )가 자동차에서 배출되는 동시 에 이 중 NO가 O 3 을 분해하기 때문이다 (Nguyen and Kim, 2006;Clapp and Jenkin, 2001). 도시 외곽 지역 (Hassan et al, 2013;Geng et al, 2008)이나 도심 공원 (Cohen et al, 2014;Kuttler and Strassburger, 1999 (Satsangi et al, 2004;Raddatz and Cummine, 2001;Gunthe et al, 1994 …”

Section: 서 론unclassified

Diurnal Variations of O₃and NO₂Concentrations in an Urban Park in Summer: Effects of Air Temperature and Wind Speed

Han¹,

Kwak²,

Baik³

2016

Journal of Korean Society for Atmospheric Environment

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The diurnal variations of O 3 and NO 2 in an urban park and the effects of air temperature and wind speed on the diurnal variations are investigated. O 3 and NO 2 concentrations were observed at a site in an urban park of Seoul from 27 July 2015 to 9 August 2015. The O 3 and NO 2 concentrations observed in the urban park are compared to those observed at the Gangnam air quality monitoring station (AQMS). The O 3 concentration is higher in the urban park than at the Gangnam AQMS in the daytime because the amount of O 3 dissociated by NO is smaller as well as partly because the amount of O 3 produced in the oxidation process of biogenic volatile organic compounds (VOCs) is larger in the urban park than at the Gangnam AQMS. The NO 2 concentration is lower in the urban park than at the Gangnam AQMS during day and night because the observation site in the urban park is relatively far from roads where NO x is freshly emitted from vehicles. The difference in NO 2 concentration is larger in the daytime than in the nighttime. To examine the effects of air temperature and wind speed on the diurnal variations of O 3 and NO 2 , the observed O 3 and NO 2 concentrations are classified into high or low air temperature and high or low wind speed days. The high O 3 and NO 2 concentrations in the daytime appear for the high air temperature and low wind speed days. This is because the daytime photochemical processes are favorable when the air temperature is high and the wind speed is low. The scatter plots of the daytime maximum O 3 and minimum NO 2 concentrations versus the daytime averages of air temperature and wind speed show that the daytime maximum O 3 and minimum NO 2 concentrations tend to increase as the air temperature increases or the wind speed decreases. The daytime maximum O 3 concentration is more sensitive to the changes in air temperature and wind speed in the urban park than at the Gangnam AQMS.

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Characterizations of ozone, NOx, and VOCs measured in Shanghai, China

Cited by 217 publications

References 14 publications

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

Characterization and assessment of volatile organic compounds (VOCs) emissions from typical industries

Diurnal Variations of O₃and NO₂Concentrations in an Urban Park in Summer: Effects of Air Temperature and Wind Speed

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Characterizations of ozone, NOx, and VOCs measured in Shanghai, China

Cited by 217 publications

References 14 publications

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China

Characterization and assessment of volatile organic compounds (VOCs) emissions from typical industries

Diurnal Variations of O3and NO2Concentrations in an Urban Park in Summer: Effects of Air Temperature and Wind Speed

Contact Info

Product

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Diurnal Variations of O₃and NO₂Concentrations in an Urban Park in Summer: Effects of Air Temperature and Wind Speed