汾渭平原太原市市区大气氨特征、区域运输及控制策略

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Pollution Research Pub Date : 2025-03-15 DOI:10.1016/j.apr.2025.102505

Mingquan Ren , Lili Guo , Yang Cui , Qiusheng He , Dongsheng Ji , Yuesi Wang

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引用次数: 0

摘要

氨（NH3）是二次无机气溶胶的重要前体，为了更好地研究NH3对中国汾渭平原PM2.5污染的影响，于2021年12月1日至2022年11月30日在太原市某城市站点进行了小时分解NH3和水溶性离子（WSI）的测量。NH3小时浓度范围为0.7 ~ 40.2 μ m−3，平均浓度为10.2±5.0 μ m−3。由于气象和排放源的影响，NH3表现出明显的季节变化：夏季；秋天比;春天比;冬天。NH3浓度日变化除秋季外，均表现为白天较高。后向轨迹聚类分析表明，太原盆地南部短距离气团TNHx （NH3+NH4+）和PM2.5浓度最高。条件概率函数和加权浓度加权轨迹函数分析表明，四季TNHx与PM2.5的分布基本一致。逐时NH3过剩分析表明，太原大气氨含量一直是充足的。SOR （nSO42−/(nSO42−+ nSO2)）和NOR （nNO3-/(nNO3- + nNO2)）随NHR （nNH3/(nNH4++nNH3)）增加而增加；n为摩尔浓度)和RH，说明在高RH条件下，NH3的气粒转化促进了SO42−和NO3−的生成。春、夏、秋、冬4个季节的临界总氨浓度分别为63%、61%、60%、53%。考虑到目前NH3难以降低，WSI浓度随TNO3 （NO3−+ HNO3）的降低呈线性下降，控制NOx排放对太原市PM2.5污染的缓解更为有效。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Characteristics, regional transport and control strategies of atmospheric ammonia in urban Taiyuan, Fenwei Plain, China

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Characteristics, regional transport and control strategies of atmospheric ammonia in urban Taiyuan, Fenwei Plain, China

Ammonia (NH₃) is a significant precursor for secondary inorganic aerosol, in order to better study the impacts of NH₃ on PM_2.5 pollution in Fenwei Plain in China, hourly-resolved NH₃ and water-soluble ions (WSI) were measured at an urban site in Taiyuan from 1 December 2021 to 30 November 2022. Hourly NH₃ concentrations ranged from 0.7 to 40.2 μg m⁻³, with an average concentration of 10.2 ± 5.0 μg m⁻³. Due to the impacts of meteorology and emission sources, NH₃ exhibited apparent seasonal variations: summer > autumn > spring > winter. Diurnal variations of NH₃ concentrations showed higher values during the daytime except in autumn. Cluster analysis of backward trajectories suggested that the southern short-distance air mass from Taiyuan Basin had the highest concentrations of TNHx (NH₃+NH₄⁺) and PM_2.5. The analysis by conditional probability function and weighted concentration weighted trajectory function showed the rough consistency between the distribution of the TNHx and PM_2.5 in four seasons. The analysis of hourly excess NH₃ showed that Taiyuan's atmosphere was always ammonia-sufficient. SOR (nSO₄²⁻/(nSO₄²⁻ + nSO₂)) and NOR (nNO₃^-/(nNO₃^- + nNO₂)) increased with NHR (nNH₃/(nNH₄⁺+nNH₃); n denotes the molar concentration) and RH in four seasons, indicating that the gas-particle conversion of NH₃ promoted the formation of SO₄²⁻ and NO₃⁻ under high RH condition. The critical total ammonia concentrations (CTACs) in spring, summer, autumn, and winter were 63 %, 61 %, 60 %, and 53 %, respectively. Considering the current difficulty in reducing NH₃ and WSI concentration decreased linearly with the reduction of TNO₃ (NO₃⁻ + HNO₃), controlling NOx emissions is more effective for PM_2.5 pollution mitigation in Taiyuan.

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来源期刊

Atmospheric Pollution Research ENVIRONMENTAL SCIENCES-

CiteScore

8.30

自引率

6.70%

发文量

256

审稿时长

36 days

期刊介绍： Atmospheric Pollution Research (APR) is an international journal designed for the publication of articles on air pollution. Papers should present novel experimental results, theory and modeling of air pollution on local, regional, or global scales. Areas covered are research on inorganic, organic, and persistent organic air pollutants, air quality monitoring, air quality management, atmospheric dispersion and transport, air-surface (soil, water, and vegetation) exchange of pollutants, dry and wet deposition, indoor air quality, exposure assessment, health effects, satellite measurements, natural emissions, atmospheric chemistry, greenhouse gases, and effects on climate change.