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Worsening summertime ozone pollution in the Guanzhong Basin, China from 2014 to 2018: Impacts of synoptic conditions and anthropogenic emissions
Abstract The ozone (O3) pollution in the Guanzhong Basin (GZB), China has progressively deteriorated from 2014 to 2018, with the summertime near-surface maximum daily 8 h average (MDA8) O3 concentration ([O3]) increasing from about 104 to 141 μg m−3, although the emission mitigation strategies have been carried out since 2013. However, it remains elusive about whether anthropogenic emissions or meteorological conditions contribute to the worsening of O3 pollution in the GZB. A subjective classification method is first used to classify the synoptic patterns influencing the GZB into favorable and unfavorable conditions. The unfavorable synoptic conditions generally correspond to less precipitation, more solar radiation and higher near-surface temperature, which facilitate formation of the O3 pollution, and it is opposite for the favorable conditions. The increasing trend of MDA8 [O3] is correlated well with the increase in occurrence of unfavorable synoptic conditions and near-surface temperature from 2014 to 2018. Sensitivity experiments using the WRF-Chem model reveals that the emission mitigation strategies from 2014 to 2018 enhance MDA8 [O3] by 19.2% on average in the GZB, which counts about 54% of the observed MDA8 O3 increasing trend. Particularly, the particulate matter decrease due to the emission mitigation contributes about 11.5% of the observed trend, caused by the reduced HO2 heterogeneous uptake and enhanced photolysis. The rest 46% of the observed MDA8 O3 increasing trend can be mainly contributed by the variation of occurrence days of unfavorable synoptic situations.
Highlights The MDA8 O3 increases by 35.5% in the Guanzhong Basin between 2014 and 2018. Increasing trend of MDA8 O3 is correlated well with the increase in occurrence of unfavorable synoptic conditions. The emission mitigation strategies count about 54% of the observed MDA8 O3 increasing trend.
Worsening summertime ozone pollution in the Guanzhong Basin, China from 2014 to 2018: Impacts of synoptic conditions and anthropogenic emissions
Abstract The ozone (O3) pollution in the Guanzhong Basin (GZB), China has progressively deteriorated from 2014 to 2018, with the summertime near-surface maximum daily 8 h average (MDA8) O3 concentration ([O3]) increasing from about 104 to 141 μg m−3, although the emission mitigation strategies have been carried out since 2013. However, it remains elusive about whether anthropogenic emissions or meteorological conditions contribute to the worsening of O3 pollution in the GZB. A subjective classification method is first used to classify the synoptic patterns influencing the GZB into favorable and unfavorable conditions. The unfavorable synoptic conditions generally correspond to less precipitation, more solar radiation and higher near-surface temperature, which facilitate formation of the O3 pollution, and it is opposite for the favorable conditions. The increasing trend of MDA8 [O3] is correlated well with the increase in occurrence of unfavorable synoptic conditions and near-surface temperature from 2014 to 2018. Sensitivity experiments using the WRF-Chem model reveals that the emission mitigation strategies from 2014 to 2018 enhance MDA8 [O3] by 19.2% on average in the GZB, which counts about 54% of the observed MDA8 O3 increasing trend. Particularly, the particulate matter decrease due to the emission mitigation contributes about 11.5% of the observed trend, caused by the reduced HO2 heterogeneous uptake and enhanced photolysis. The rest 46% of the observed MDA8 O3 increasing trend can be mainly contributed by the variation of occurrence days of unfavorable synoptic situations.
Highlights The MDA8 O3 increases by 35.5% in the Guanzhong Basin between 2014 and 2018. Increasing trend of MDA8 O3 is correlated well with the increase in occurrence of unfavorable synoptic conditions. The emission mitigation strategies count about 54% of the observed MDA8 O3 increasing trend.
Worsening summertime ozone pollution in the Guanzhong Basin, China from 2014 to 2018: Impacts of synoptic conditions and anthropogenic emissions
Bei, Naifang (author) / Liang, Jiayi (author) / Li, Xia (author) / Wang, Ruonan (author)
Atmospheric Environment ; 274
2022-01-24
Article (Journal)
Electronic Resource
English
Hydrogeochemical Behavior of Shallow Groundwater around Hancheng Mining Area, Guanzhong Basin, China
| DOAJ | 2024