Effectiveness of short term air quality emission controls: A high-resolution model study of Beijing during the APEC period
Effectiveness of short term air quality emission controls: A high-resolution model study of Beijing during the APEC period
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DOI：
10.5194/acp-2018-1173
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发表时间：
2019-01
影响因子：
6.3
通讯作者：
T. Ansari;O. Wild;Jie Li;Ting Yang;Weiqi Xu;Yele Sun;Zifa Wang
中科院分区：
文献类型：
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作者：
T. Ansari;O. Wild;Jie Li;Ting Yang;Weiqi Xu;Yele Sun;Zifa Wang
摘要。本文利用高分辨率WRF-Chem模拟研究了2014年10 - 11月北京地区排放控制对雾霾的影响。该模式很好地再现了这一时期的地表温度和相对湿度分布，并捕获了观测到的主要大气污染物的变化。我们强调了模拟污染物水平对气象变量和模式分辨率的敏感性，特别是对行星边界层湍流混合的处理。我们注意到，模拟该地区的颗粒组成仍然是一个挑战，我们高估了NH4和NO3，而牺牲了SO4。我们发现，APEC峰会期间实施的排放控制对改善空气质量的贡献相对较小（20 - 26%），突出了这一时期有利的气象条件所起的重要作用。我们证明，在不利的气象条件下，同样的控制措施不足以将污染物水平降低到符合要求的标准。在6周的时间内继续实施这些控制措施只会将日平均细颗粒物超过75 μg m - 3的雾霾天数从15天减少到13天。我们的研究强调了当前排放控制的局限性，以及在气象停滞天气期间对更广泛地区采取更严格措施的必要性。
Abstract. We explore the impacts of emission controls on haze events in Beijing in October–November 2014 using high resolution WRF-Chem simulations. The model reproduces surface temperature and relative humidity profiles over the period well and captures the observed variations in key atmospheric pollutants. We highlight the sensitivity of simulated pollutant levels to meteorological variables and model resolution, and in particular to treatment of turbulent mixing in the planetary boundary layer. We note that simulating particle composition in the region remains a challenge, and we overpredict NH4 and NO3 at the expense of SO4. We find that the emission controls implemented for the APEC Summit period made a relatively small contribution to improved air quality (20–26 %), highlighting the important role played by favourable meteorological conditions over this period. We demonstrate that the same controls applied under less favourable meteorological conditions would have been insufficient to reduce pollutant levels to meet the required standards. Continued application of these controls over the 6-week period considered would only have reduced the number of haze days where daily-mean fine particulate matter exceeds 75 μg m−3 from 15 to 13 days. Our study highlights the limitations of current emission controls and the need for more stringent measures over a wider region during meteorologically stagnant weather.