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Precursors and potential sources of ground-level ozone in suburban Shanghai
Frontiers of Environmental Science & Engineering ( IF 6.1 ) Pub Date : 2020-06-03 , DOI: 10.1007/s11783-020-1271-8
Kun Zhang , Jialuo Xu , Qing Huang , Lei Zhou , Qingyan Fu , Yusen Duan , Guangli Xiu

A high level of ozone (O3) is frequently observed in the suburbs of Shanghai, the reason for this high level remains unclear. To obtain a detailed insight on the high level of O3 during summer in Shanghai, O3 and its precursors were measured at a suburban site in Shanghai from July 1, 2016 to July 31, 2016. Using the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model and concentration weighted trajectories (CWT), we found that Zhejiang province was the main potential source of O3 in suburban Shanghai. When the sampling site was controlled by south-western winds exceeding 2 m/s, the O3-rich air masses from upwind regions (such as Zhejiang province) could be transported to the suburban Shanghai. The propylene-equivalent concentration (PEC) and ozone formation potential (OFP) were further calculated for each VOC species, and the results suggested that propylene, (m + p)-xylene, and toluene played dominant roles in O3 formation. The Ozone Isopleth Plotting Research (OZIPR) model was used to reveal the impact of O3 precursors on O3 formation, and 4 base-cases were selected to adjust the model simulation. An average disparity of 18.20% was achieved between the simulated and observed O3 concentrations. The O3 isopleth diagram illustrated that O3 formation in July 2016 was in VOC-sensitive regime, although the VOC/NOx ratio was greater than 20. By introducing sensitivity (S), a sensitivity analysis was performed for O3 formation. We found that O3 formation was sensitive to propylene, (m + p)-xylene, o-xylene and toluene. The results provide theoretical support for O3 pollution treatment in Shanghai.



中文翻译:

上海郊区地面臭氧的前兆和潜在来源

在上海郊区经常观察到高浓度的臭氧(O 3),其高浓度的原因尚不清楚。为了详细了解上海夏季的O 3含量,于2016年7月1日至2016年7月31日在上海郊区进行了O 3及其前体的测量。使用混合单粒子拉格朗日积分轨迹(HYSPLIT)模型和浓度加权轨迹(CWT),我们发现浙江省是上海郊区O 3的主要潜在来源。当采样地点受到西南风超过2 m / s的控制时,O 3来自上风地区(例如浙江省)的大量空气可以被运输到上海郊区。进一步计算了每种VOC种类的丙烯当量浓度(PEC)和臭氧形成潜能(OFP),结果表明丙烯,(m + p)-二甲苯和甲苯在O 3形成中起主要作用。臭氧等值线图研究(OZIPR)模型用于揭示O 3前体对O 3形成的影响,并选择4个基本案例来调整模型模拟。在模拟和观察到的O 3浓度之间平均差异为18.20%。O 3等值线图说明了O 3尽管VOC / NO x比率大于20 ,但2016年7月的形成是在VOC敏感的状态下。通过引入敏感度(S),对O 3形成进行了敏感度分析。我们发现O 3的形成对丙烯,(m + p)-二甲苯,邻二甲苯和甲苯敏感。研究结果为上海O 3污染治理提供了理论依据。

更新日期:2020-06-01
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