Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Chemosphere. 2020 Dec;261:127729. doi: 10.1016/j.chemosphere.2020.127729. Epub 2020 Jul 29.
The effect of emission control measures on ozone (O) concentrations in Hangzhou during G20 (The Group of Twenty Finance Ministers and Central Bank Governors) meeting during 24 August to 6 September of 2016 was evaluated using the nested version of a global chemical transport model. During G20, observed concentrations of PM, PM, SO, NO, and CO were all below national air quality standards, whereas those of MDA8 O were above national standard (with an averaged value of 160.2 μg m) but had a decreasing trend. Model sensitivity studies show that, MDA8 O concentrations in Hangzhou during G20 were reduced by 11.3 μg m (6.8%), 14.8 μg m (8.9%), and 19.5 μg m (11.7%) with emission control measures in the core area, Zhejiang province, and the Yangtze River Delta (YRD) region, respectively, indicating that control measures were the most effective when carried out jointly in YRD. Considering the ratios of NO to VOCs during G20, Hangzhou and most areas of Zhejiang province were in transitional regime; reductions in either NO or VOCs could reduce O concentrations. We also quantified how sensitive O concentrations respond to emission reductions in sectors of industry, power, residential and transportation in the whole of YRD during G20. The removal of emissions in industry and transportation sectors would lead to the largest reductions of 17.6 μg m (10.5%) and 12.3 μg m (7.4%) in MDA8 O concentrations in Hangzhou during G20, respectively. This study has important implications for the control of high O levels in eastern China.
利用嵌套式全球化学输送模式评估了 2016 年 8 月 24 日至 9 月 6 日 G20 峰会期间杭州采取的减排措施对臭氧（O）浓度的影响。在 G20 期间，观测到的 PM、PM、SO、NO 和 CO 的浓度均低于国家空气质量标准，而 MDA8-O 的浓度则高于国家标准（平均值为 160.2μg/m），但呈下降趋势。模型敏感性研究表明，在 G20 期间，采取核心区域（浙江省）和长三角（YRD）地区的减排措施，杭州 MDA8-O 浓度分别降低了 11.3μg/m（6.8%）、14.8μg/m（8.9%）和 19.5μg/m（11.7%），表明在 YRD 地区联合采取控制措施最为有效。考虑到 G20 期间 NO 与 VOCs 的比值，杭州和浙江省大部分地区处于过渡区；减少 NO 或 VOCs 均可降低 O 浓度。我们还量化了在整个 YRD 地区，G20 期间各行业（工业、电力、居民和交通）的减排措施对 O 浓度的敏感性。在工业和交通部门减少排放将导致 G20 期间杭州 MDA8-O 浓度最大降幅分别为 17.6μg/m（10.5%）和 12.3μg/m（7.4%）。本研究对控制中国东部地区高 O 水平具有重要意义。
