Investigating the role of photochemistry and impact of regional and local contributions on gaseous pollutant concentrations (NO, NO2, O3, CO, and SO2) at urban and suburban sites

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Atmospheric Pollution Research Pub Date : 2024-09-28 DOI:10.1016/j.apr.2024.102322
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Abstract

Gaseous pollutant concentrations were monitored for one year in urban (NO, NO2, O3, CO, and SO2) and suburban (NO, NO2, and O3) sites. Common characteristics were identified at both sites, such as higher concentrations during typical winter months for all pollutants except O3. Increased NO, NO2, CO and SO2 concentrations during wintertime were linked to residential heating emissions, with pairwise correlations showing CO as marker for the study site. O3 production was lower in wintertime but higher in summertime at both sites based on its seasonal cycle and the impact of sunlight. Furthermore, diurnal variations showed that traffic emissions during rush hours most profoundly affected CO and NO. Nevertheless, NOx were characteristically higher at the urban site based on the burdened environment, whereas O3 was higher at the suburban site due to the lower destruction rates. O3 was the dominant oxidant at both sites, with a linear regression between OX and NOx revealing a negative relationship. This observation suggested a dominant regional contribution to oxidant concentrations. In addition, abnormally high O3 concentrations in relation to the season were reported for the first time at the study sites. Elevated concentrations were measured in parallel with Sahara dust events indicating noteworthy atmospheric conditions that require further assessment. Other O3 burdened periods were driven by regional transport of polluted plumes from the northeast. Lastly, nocturnal increases in O3 were observed and associated with enhanced vertical mixing.
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调查光化学的作用以及区域和地方因素对城市和郊区气态污染物(一氧化氮、二氧化氮、臭氧、一氧化碳和二氧化硫)浓度的影响
对市区(NO、NO2、O3、CO 和 SO2)和郊区(NO、NO2 和 O3)的气态污染物浓度进行了为期一年的监测。在这两个地点都发现了共同的特征,例如在典型的冬季月份,除 O3 外,所有污染物的浓度都较高。冬季一氧化氮、二氧化氮、一氧化碳和二氧化硫浓度的增加与居民取暖排放物有关,成对相关性表明一氧化碳是研究地点的标记物。根据臭氧的季节周期和阳光的影响,两个研究地点的臭氧产生量在冬季较低,而在夏季较高。此外,昼夜变化表明,高峰时段的交通排放对一氧化碳和氮氧化物的影响最大。尽管如此,由于环境负担沉重,市区的氮氧化物明显较高,而郊区的臭氧由于破坏率较低而较高。O3 是这两个地点的主要氧化剂,OX 与 NOx 之间的线性回归显示出负相关关系。这一观察结果表明,氧化剂浓度主要来自区域。此外,研究地点首次报告了与季节相关的异常高浓度的臭氧。浓度升高与撒哈拉沙尘事件同时发生,表明大气条件值得注意,需要进一步评估。其他臭氧浓度较高的时段则是由来自东北部的区域污染羽流造成的。最后,观测到夜间臭氧浓度升高,这与垂直混合增强有关。
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来源期刊
Atmospheric Pollution Research
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.
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