Stable carbon and nitrogen isotopic characteristics of PM2.5 and PM10 in Delhi, India

IF 3 4区地球科学 Q2 ENVIRONMENTAL SCIENCES

Journal of Atmospheric Chemistry Pub Date : 2022-01-23 DOI:10.1007/s10874-022-09429-0

Sudhir Kumar Sharma, Supriya G. Karapurkar, Damodar M. Shenoy, Tuhin Kumar Mandal

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引用次数: 5

Abstract

This study presents the chemical composition (carbonaceous and nitrogenous components) of aerosols (PM_2.5 and PM₁₀) along with stable isotopic composition (δ¹³C and δ¹⁵N) collected during winter and the summer months of 2015–16 to explore the possible sources of aerosols in megacity Delhi, India. The mean concentrations (mean ± standard deviation at 1σ) of PM_2.5 and PM₁₀ were 223 ± 69 µg m⁻³ and 328 ± 65 µg m⁻³, respectively during winter season whereas the mean concentrations of PM_2.5 and PM₁₀ were 147 ± 22 µg m⁻³ and 236 ± 61 µg m⁻³, respectively during summer season. The mean value of δ¹³C (range: − 26.4 to − 23.4‰) and δ¹⁵N (range: 3.3 to 14.4‰) of PM_2.5 were − 25.3 ± 0.5‰ and 8.9 ± 2.1‰, respectively during winter season whereas the mean value of δ¹³C (range: − 26.7 to − 25.3‰) and δ¹⁵N (range: 2.8 to 11.5‰) of PM_2.5 were − 26.1 ± 0.4‰ and 6.4 ± 2.5‰, respectively during the summer season. Comparison of stable C and N isotopic fingerprints of major identical sources suggested that major portion of PM_2.5 and PM₁₀ at Delhi were mainly from fossil fuel combustion (FFC), biomass burning (BB) (C-3 and C-4 type vegitation), secondary aerosols (SAs) and road dust (SD). The correlation analysis of δ¹³C with other C (OC, TC, OC/EC and OC/WSOC) components and δ¹⁵N with other N components (TN, NH₄⁺ and NO₃⁻) are also support the source identification of isotopic signatures.

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德里地区PM2.5和PM10碳氮稳定同位素特征

本研究展示了2015-16年冬季和夏季收集的气溶胶(PM2.5和PM10)的化学成分(碳质和氮质成分)以及稳定同位素组成(δ13C和δ15N)，以探索印度大城市德里气溶胶的可能来源。冬季PM2.5和PM10的平均浓度(平均±标准差为1σ)分别为223±69µg m - 3和328±65µg m - 3，夏季PM2.5和PM10的平均浓度分别为147±22µg m - 3和236±61µg m - 3。冬季PM2.5 δ13C(- 26.4 ~ - 23.4‰)和δ15N(- 3.3 ~ 14.4‰)的平均值分别为- 25.3±0.5‰和8.9±2.1‰，夏季PM2.5 δ13C(- 26.7 ~ - 25.3‰)和δ15N(- 2.8 ~ 11.5‰)的平均值分别为- 26.1±0.4‰和6.4±2.5‰。主要相同来源的稳定碳、氮同位素指纹图谱比较表明，德里PM2.5和PM10主要来自化石燃料燃烧(FFC)、生物质燃烧(BB) (C-3和C-4型植被)、二次气溶胶(SAs)和道路粉尘(SD)。δ13C与其他碳组分(OC、TC、OC/EC和OC/WSOC)的相关性分析和δ15N与其他氮组分(TN、NH4+和NO3−)的相关性分析也支持了同位素特征的来源识别。

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来源期刊

Journal of Atmospheric Chemistry 地学-环境科学

CiteScore

4.60

自引率

5.00%

发文量

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.