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Agricultural ammonia emissions and its impact on PM2.5 concentrations in the Beijing–Tianjin–Hebei region from 2000 to 2018
Environmental Pollution ( IF 7.6 ) Pub Date : 2021-09-11 , DOI: 10.1016/j.envpol.2021.118162
Long Cheng 1 , Zhilan Ye 1 , Shuiyuan Cheng 1 , Xiurui Guo 1
Affiliation  

Ammonia (NH3) discharged from agricultural activities to the atmosphere plays a crucial role in the formation of secondary inorganic aerosols. This study analyzed the temporal-spatial development of agricultural NH3 emissions from 2000 to 2018 in the Beijing–Tianjin–Hebei (BTH) region and assessed the effects of reducing PM2.5 by removing agricultural NH3 using an air quality model. The results showed that the interannual agricultural NH3 emissions in the BTH region exhibited a stairs trend from 2000 to 2018, with an average of 971.63 Gg. In particular, agricultural NH3 emissions in the BTH region reached a maximum in summer when the temperature was high and were more concentrated in the southern plains compared to the northern areas. Under the reduction scenario (RS), the agricultural NH3 emissions in the BTH region in 2015, 2016, 2017, and 2018 were reduced by 2.95%, 4.10%, 18.75%, and 10.21%, resulting in a reduction of 0.5%, 0.5%, 2.5%, and 1.2% of annual mean PM2.5 concentration, respectively, compared with the baseline scenario (BS). Furthermore, agricultural NH3 emissions contributed 12.6, 12.1, 11.9, and 11.3 μg m−3 to PM2.5 concentrations in 2015, 2016, 2017, and 2018 under the zero-emission scenario (ZS), respectively. However, the contribution rates exhibited a slightly increasing trend from 20.5% in 2015 to 24.6% in 2018. These findings could provide a new understanding of agricultural NH3 emission trends and their impacts on PM2.5 concentration based on actual NH3 mitigation ratios in recent years, thereby guiding the formulation of future control strategies.



中文翻译:

2000-2018年京津冀地区农业氨排放及其对PM2.5浓度的影响

从农业活动中排放到大气中的氨 (NH 3 ) 在二次无机气溶胶的形成中起着至关重要的作用。本研究分析了2000 年至 2018 年京津冀 (BTH) 地区农业 NH 3排放的时空变化,并使用空气质量模型评估了通过去除农业 NH 3来减少 PM 2.5的效果。结果表明,2000-2018年京津冀地区农业NH 3年际排放量呈阶梯状变化,平均为971.63 Gg。特别是,农业 NH 3京津冀地区的排放在夏季高温时达到最大值,与北部地区相比,更集中在南部平原。在减排情景(RS)下,京津冀地区2015年、2016年、2017年和2018年的农业NH 3排放量分别减少了2.95%、4.10%、18.75%和10.21%,从而减少了0.5%,与基线情景 (BS) 相比,年平均 PM 2.5浓度分别为0.5%、2.5% 和 1.2% 。此外,农业 NH 3排放对PM 2.5贡献了 12.6、12.1、11.9 和 11.3 μg m -32015 年、2016 年、2017 年和 2018 年零排放情景(ZS)下的浓度。然而,贡献率呈现出从 2015 年的 20.5% 到 2018 年的 24.6% 的小幅上升趋势。这些发现可以提供对农业 NH 3排放趋势及其对 PM 2.5浓度影响的新认识,基于最近的实际 NH 3缓解率年,从而指导未来控制策略的制定。

更新日期:2021-09-21
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