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Spatiotemporal variation of surface ozone and its causes in Beijing, China since 2014
Abstract The surface ozone (O3) spatiotemporal distribution, variations and its causes in Beijing in 2014–2020 are revealed by quantitative estimates of the trends of 12 ozone metrics relevant to human health and tropospheric NO2 and formaldehyde (HCHO) column concentration, based on the air quality monitoring network data and satellite retrievals from the Ozone Monitoring Instrument (OMI). Results showed that the maximum O3 concentrations decreased slightly since 2014. The annual 90th percentile of the daily maximum 8-h average (MDA8) O3 and the “ozone-season” (April–September) MDA8 decreased by 0.32 and 0.19 μg m−3 year−1, respectively. The changes in Beijing contrast the widespread and significant O3 increases in the Beijing–Tianjin–Hebei region in recent years. However, significant positive trends in MDA8-90th and ozone-season MDA8 were observed in 7% and 14% of monitoring sites in Beijing (p < 0.05), most of which are located in urban areas and suburbs close to urban areas. The spatial distribution of high O3 values in Beijing has changed significantly. The areas with high O3 concentrations shifted from the northern suburbs (Changping and Miyun districts) to the northeastern and southwestern suburbs and the east of the central urban area. The ozone-season NO2 and HCHO tropospheric columns showed reductions of 4.2% and 0.4% year−1, respectively, from 2014 to 2019 in Beijing, which suggested that the decrease in NOX emissions was much greater than the decrease in volatile organic compound (VOC) emissions. Such an extremely inappropriate control ratio of ozone precursor NOX/VOCs led to an overall trend of slow declining fluctuations of O3 and an increasing trend of individual sites in Beijing. Obviously, the reduction of VOCs in Beijing is far from sufficient, and the significant decrease of Beijing's O3 concentration can only be achieved by a drastically reduction in VOC emissions.
Graphical abstract Display Omitted
Highlights The high O3 concentrations decreased slightly during 2014–2020 in Beijing. The spatial distribution of high O3 values in Beijing has changed. Changes in O3 precursors emissions were uncovered by satellite data. The O3 increase in individual sites were due to an improper NOX/VOCs control ratio. The reduction of VOCs should be greater than the reduction of NOX in the near future.
Spatiotemporal variation of surface ozone and its causes in Beijing, China since 2014
Abstract The surface ozone (O3) spatiotemporal distribution, variations and its causes in Beijing in 2014–2020 are revealed by quantitative estimates of the trends of 12 ozone metrics relevant to human health and tropospheric NO2 and formaldehyde (HCHO) column concentration, based on the air quality monitoring network data and satellite retrievals from the Ozone Monitoring Instrument (OMI). Results showed that the maximum O3 concentrations decreased slightly since 2014. The annual 90th percentile of the daily maximum 8-h average (MDA8) O3 and the “ozone-season” (April–September) MDA8 decreased by 0.32 and 0.19 μg m−3 year−1, respectively. The changes in Beijing contrast the widespread and significant O3 increases in the Beijing–Tianjin–Hebei region in recent years. However, significant positive trends in MDA8-90th and ozone-season MDA8 were observed in 7% and 14% of monitoring sites in Beijing (p < 0.05), most of which are located in urban areas and suburbs close to urban areas. The spatial distribution of high O3 values in Beijing has changed significantly. The areas with high O3 concentrations shifted from the northern suburbs (Changping and Miyun districts) to the northeastern and southwestern suburbs and the east of the central urban area. The ozone-season NO2 and HCHO tropospheric columns showed reductions of 4.2% and 0.4% year−1, respectively, from 2014 to 2019 in Beijing, which suggested that the decrease in NOX emissions was much greater than the decrease in volatile organic compound (VOC) emissions. Such an extremely inappropriate control ratio of ozone precursor NOX/VOCs led to an overall trend of slow declining fluctuations of O3 and an increasing trend of individual sites in Beijing. Obviously, the reduction of VOCs in Beijing is far from sufficient, and the significant decrease of Beijing's O3 concentration can only be achieved by a drastically reduction in VOC emissions.
Graphical abstract Display Omitted
Highlights The high O3 concentrations decreased slightly during 2014–2020 in Beijing. The spatial distribution of high O3 values in Beijing has changed. Changes in O3 precursors emissions were uncovered by satellite data. The O3 increase in individual sites were due to an improper NOX/VOCs control ratio. The reduction of VOCs should be greater than the reduction of NOX in the near future.
Spatiotemporal variation of surface ozone and its causes in Beijing, China since 2014
Ren, Jie (author) / Hao, Yufang (author) / Simayi, Maimaiti (author) / Shi, Yuqi (author) / Xie, Shaodong (author)
Atmospheric Environment ; 260
2021-06-10
Article (Journal)
Electronic Resource
English
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