Stable isotopic, bulk, and molecular compositions of post-monsoon biomass-burning aerosols in Delhi suggest photochemical ageing during regional transport is more pronounced than local processing

IF 3 4区 地球科学 Q2 ENVIRONMENTAL SCIENCES
Rishu Agarwal, Shankar Gopala Aggarwal, Bhagawati Kunwar, Dhananjay Kumar Deshmukh, Khem Singh, Daya Soni, Kimitaka Kawamura
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引用次数: 0

Abstract

The composition of aerosols influenced by regional pollution sources during a post-monsoon haze event was studied including the isotopic, bulk, and molecular signatures. The air mass back trajectory and fire spot analysis revealed that the Delhi aerosols were influenced by the regional post-harvest crop (rice plant) residue-burning activities during the sampling period. To better understand the atmospheric processes during such an event, three samples of 4 h duration each (Period I: from 06:00–10:00, Period II: 10:00–14:00, and Period III: 14:00–18:00 h local time) were collected during the sampling period (8th -17th November, 2019) in the daytime. The average mass concentration of PM2.5, molecular compounds including the inorganic and carbonaceous components (dicarboxylic acid class compounds), along with the stable isotopes of C and N were observed to be elevated during Period I of the study. NH4+ and SO42− were found to be the most abundant inorganic ions during Period II and III with Cl being the dominant ion during Period I. The OC/EC, WSOC/EC ratios indicated the influence of biomass burning on Delhi aerosols with little influence of local ageing processes evident from the minimal variation observed between the three periods of study during the day. High concentrations of dicarboxylic acids than previous studies are reported with oxalic and succinic acid being the most abundant diacids, a typical behaviour observed in biomass-burning influenced aerosols with an interesting observation of terephthalic acid to be found in an appreciable amount. The δ15 N of TN and δ13 C of TC signatures clearly indicated the influence of emissions from the burning of a C3 plant on the aerosols. The results strongly suggested that the aerosols were influenced by biomass-burning activities in the neighbouring regions and were aged during the atmospheric transport over to the city of Delhi with minimal effect of local ageing processes during the study period.

德里季风后生物质燃烧气溶胶的稳定同位素、体积和分子组成表明,区域迁移过程中的光化学老化比本地处理更为明显
研究了季风后雾霾事件期间受区域污染源影响的气溶胶组成,包括同位素、体积和分子特征。气团回溯轨迹和火点分析表明,在采样期间,德里气溶胶受到了区域收获后作物(水稻)残留物焚烧活动的影响。为了更好地了解此类活动期间的大气过程,在采样期间(2019 年 11 月 8 日至 17 日)的白天采集了三个样本,每个样本持续 4 小时(期间 I:当地时间 06:00-10:00;期间 II:当地时间 10:00-14:00;期间 III:当地时间 14:00-18:00)。在研究期间 I,观察到 PM2.5、分子化合物(包括无机和碳质成分(二羧酸类化合物))以及 C 和 N 的稳定同位素的平均质量浓度升高。研究发现,NH4+ 和 SO42- 是周期 II 和 III 中含量最高的无机离子,而 Cl- 则是周期 I 中的主要离子。OC/EC、WSOC/EC 比率表明生物质燃烧对德里气溶胶的影响,从白天三个研究时段之间的最小变化可以看出,当地老化过程的影响很小。与之前的研究相比,报告中二羧酸的浓度较高,草酸和琥珀酸是含量最高的二元酸,这是生物质燃烧影响气溶胶中观察到的典型行为,有趣的是还发现了相当数量的对苯二甲酸。TN 的 δ15 N 和 TC 的 δ13 C 标志清楚地表明了 C3 植物燃烧排放物对气溶胶的影响。研究结果强烈表明,气溶胶受到邻近地区生物质燃烧活动的影响,并在向德里市的大气传输过程中被老化,研究期间当地老化过程的影响微乎其微。
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来源期刊
Journal of Atmospheric Chemistry
Journal of Atmospheric Chemistry 地学-环境科学
CiteScore
4.60
自引率
5.00%
发文量
16
审稿时长
7.5 months
期刊介绍: The Journal of Atmospheric Chemistry is devoted to the study of the chemistry of the Earth''s atmosphere, the emphasis being laid on the region below about 100 km. The strongly interdisciplinary nature of atmospheric chemistry means that it embraces a great variety of sciences, but the journal concentrates on the following topics: Observational, interpretative and modelling studies of the composition of air and precipitation and the physiochemical processes in the Earth''s atmosphere, excluding air pollution problems of local importance only. The role of the atmosphere in biogeochemical cycles; the chemical interaction of the oceans, land surface and biosphere with the atmosphere. Laboratory studies of the mechanics in homogeneous and heterogeneous transformation processes in the atmosphere. Descriptions of major advances in instrumentation developed for the measurement of atmospheric composition and chemical properties.
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