Impact of meteorological conditions at multiple scales on ozone concentration in the Yangtze River Delta

Zhao, Zezheng; Zhou, Zeming; Russo, Ana; Du, Haibo; Xiang, Jie; Zhang, Jiping; Zhou, Chengjun

doi:10.1007/s11356-021-15160-2

Cited by 18 publications

(12 citation statements)

References 58 publications

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“…Furthermore, liquid-phase related SOA were found to increase during severe haze when relatively humidity was high (Xu et al, 2017;Zhao et al, 2019). These results highlight the importance of reducing, not only 55 the primary particulate emissions, but also the anthropogenic gaseous precursors to suppress secondary aerosol formation in regional scales (Du et al, 2021;.…”

Section: Introductionmentioning

confidence: 76%

“…14d) during Olympics, which could partially be related to the low NOx concentrations. However, as the level of O3 is affected by many factors, such as meteorological conditions, regional transport (Ge et al, 2012;Lin et al, 345 2019;Liu et al, 2019;Zhao et al, 2021), photochemical processes associated with solar radiation, NOx and VOCs (Li et al, 2020a;Tan et al, 2018), further analysis is highly needed for digging out these causes. Additionally, O3 and PM2.5 showed a non-linear relationship during the special event period (Fig.…”

mentioning

confidence: 99%

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Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Guo

Deng

Ovaska

et al. 2022

Preprint

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Abstract. Comprehensive measurements are vital to obtain big enough datasets for better understanding the complex atmosphere and further improving the air quality. To investigate the year-to-year variabilities of air quality and influences of special events (Beijing Winter Olympics, COVID lockdown and Chinese New Year) on it during the wintertime in a polluted urban air, we conducted comprehensive observations in Beijing, China, during January 1st – February 20th, in the years from 2019 to 2022. The mass concentration of PM2.5 and its composition (organics, nitrate, sulfate, ammonium, chloride and black carbon), number size distributions of particles (down to ~1 nm) and ions, gaseous pollutants (CO, NOx, SO2, O3), condensable vapors (sulfuric acid and oxygenated organic molecules), as well as meteorological parameters were simultaneously measured. We selected the period before January 22nd without any special events in each year to show the year-to-year variabilities of the air quality. We found that the concentrations of PM2.5, black carbon, chloride, organics, CO, NOx, total oxygenated organic molecules and number concentration of sub 3 nm particles showed similar year-to-year variabilities, decreasing from 2019 to 2021 and then increasing in 2022. On the contrary, SO2 concentrations decreased year by year due to the significant emission reduction, leading to decreasing mass concentrations of sulfate and number concentration of sulfuric acid monomer and dimer from 2019 to 2022. As for the influence of special events, due to the favorable meteorological conditions together with reductions in anthropogenic emissions, there were basically no haze events during Beijing Winter Olympics. Although there was emission reduction also during the COVID lockdown period, especially for NOx, the enhancement of secondary inorganic aerosol formation, together with unfavorable meteorological conditions, caused severe haze events during this period. Additionally, these special events had only little impacts on the new particle formation processes. These results provide useful information to the development of more targeted pollution control plans.

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Section: Introductionmentioning

confidence: 76%

mentioning

confidence: 99%

Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Guo

Deng

Ovaska

et al. 2022

Preprint

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“…In addition, a report assessed the trend of the ozone in Hong Kong and the Pearl River Delta in South China and investigated the interannual changes in the sensitivity of ozone to air temperature, and the trends in regional precursors [20]. Zhao et al found that high temperature exacerbated ozone pollution in the study area [21]. Chen et al showed that tropospheric ozone in southern China had a gradually increasing trend [22].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Variations and Influent Factors of Tropospheric Ozone Concentration over China Based on OMI Data

2022

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Spatiotemporal distribution of atmospheric pollutants has been a hot topic in the field of environmental science in recent years. Rapid economic development, urbanization, and industrialization have resulted in a significant increase in ozone emissions, and China is facing the issue of air pollution with high ozone concentrations in the ambient air. The Aura ozone monitoring instrument (OMI), can provide long-term and large-scale dynamic monitoring of tropospheric column ozone (TCO). The TCO concentrations over China were extracted and analyzed from 2005 to 2019. The results showed that the spatiotemporal distribution of ozone concentration decreased from northeast to southeast in China. The seasonal variations of ozone concentration were spring’s concentration is greater than winter’s concentration, winter’s concentration is greater than summer’s concentration, summer’s concentration is greater than autumn's concentration. The monthly variation showed a cyclical trend, with low values observed from June to November and high values from December to May. In addition, the spatiotemporal distribution of ozone concentration was affected by natural factors and anthropogenic factors. Regarding natural factors, TCO concentration was positively correlated with temperature, wind field, and vegetation coverage, but negatively with precipitation in southwest China. Regarding anthropogenic factors, TCO concentration showed a significant positive correlation with regional GDP, oxides of nitrogen (NOx), and volatile organic compounds (VOCs) in most areas of China. Clustering of backward air trajectories revealed that northwest and southeast airflows led to a higher TCO concentration in northeast China. These further indicate that the variation of TCO concentration was affected by many factors, but temperature, wind field, and the emissions of NOx and VOCs were the key factors.

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“…Mastering the diffusion and transport laws of pollutants is very important to quantify air pollution levels, meteorological conditions play an important role in the diffusion and transport of pollutants (Li et al, 2012;Mao et al, 2020;Miao et al, 2017;Wang et al, 2016;Zong et al, 2021;Zhao et al, 2019Zhao et al, , 2021aZhao et al, , 2021bSun et al, 2018Sun et al, , 2019. The meteorological conditions mainly include large-scale synoptic circulation and the mesoscale meteorological conditions (Zhou et al, 2018(Zhou et al, , 2019Wang et al, 2022;Russo et al, 2014, Russo et al, 2016.…”

Section: Introductionmentioning

confidence: 99%

Collective influences of boundary layer process and synoptic circulation on particulate pollution: A new study in changsha-zhuzhou-xiangtan urban agglomeration of central china

Wang

Du²,

Zhao³

et al. 2022

Front. Environ. Sci.

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Particulate matter pollution is increasingly serious in Changsha-Zhuzhou-Xiangtan urban agglomeration (CZT) due to rapid industrialization and urbanization. Particulate matter pollution and weather conditions are closely related. In this study, the relationship between the large-scale weather circulation types (CTs), horizontal recirculation wind field, boundary layer structure and particulate matter pollution (PM2.5) in CZT was systematically investigated. Firstly, the Allwine and Whiteman (AW) wind field classification method and Richardson method were used to calculate the horizontal recirculation index and the planetary boundary layer height (PBLH) in CZT. By analyzing the relationship among the recirculation index, the PBLH and the particle concentration, it was found that the recirculation process in CZT could be divided into horizontal recirculation and “pseudo recirculation”. Then, the circulation patterns affecting the CZT were divided into nine types (CT1-CT9) by using T-mode PCA method based on 925 hpa geopotential data. The CZT was prone to recirculation under the control of high pressure rear (CT4), weak high pressure edge (CT5) and southwest vortex (CT7, CT8). It was found that CT4 and CT5 accompanied with lower PBLH and poorer vertical diffusion conditions characterized by high particle concentration. While CT7 and CT8 accompanied with higher PBLH and better vertical diffusion conditions characterized by low particle concentration. Finally, the effect of CTs, recirculation index and boundary layer structure on paticle matter concentration were assessed during two recirculation processes in December 2016 and August 2017, repectively. The analysis was complemented with FLEXPART-WRF model simulations, which confirmed that the recirculation and “pseudo recirculation” can be effectively distinguished by introducing the PBLH, combined with the large-scale weather circulation.

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Impact of meteorological conditions at multiple scales on ozone concentration in the Yangtze River Delta

Cited by 18 publications

References 58 publications

Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Spatiotemporal Variations and Influent Factors of Tropospheric Ozone Concentration over China Based on OMI Data

Collective influences of boundary layer process and synoptic circulation on particulate pollution: A new study in changsha-zhuzhou-xiangtan urban agglomeration of central china

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