西安冬季元素碳气溶胶的碳同位素组成及来源变化
Carbon Isotope Composition and Source Analysis of Element Carbon Aerosol in Winter of Xi'an
查看参考文献43篇
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文摘
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大气细颗粒物(PM_(2.5))对气候变化和人体健康具有重要影响。PM_(2.5)中的元素碳(EC)在大气中不发生反应,所以其来源变化可以指示PM_(2.5)一次燃烧源的变化。本文结合放射性碳同位素(~(14)C)和稳定碳同位素(~(13)C)方法,分析了西安2008/ 2009年和2015/ 2016年冬季PM_(2.5)中EC的同位素组成。~(14)C的分析结果表明,西安冬季EC的主要来源为化石燃料燃烧,2008/ 2009年和2015/ 2016年化石燃料燃烧对EC的贡献分别为77%±4%和72%±5%。~(13)C的分析结果表明,2015/ 2016年西安冬季EC排放源主要来自液体化石燃料燃烧(机动车排放)(δ~(13)C_(EC): -25.04‰ ~ -24.64‰, -24.80‰±0.21‰),而2008/ 2009年冬季燃煤对EC的贡献更为显著(δ~(13)C_(EC): -23.72‰ ~ -22.81‰, -23.22‰±0.39‰)。对比~(14)C和~(13)C的数据发现,近十年西安冬季EC排放源的变化显著,燃煤的相对贡献降低,而机动车排放的贡献升高,这与煤改气和机动车保有量的急速增加有关。 |
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其他语种文摘
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Fine particulate matter (PM_(2.5) )play an important role in climate and human health. The element carbon (EC)in PM_(2.5) doesn't react in atmosphere, so its sources can indicate the change of primary combustion sources. This work aims to identify the sources of EC in winter of Xi'an in 2008/ 2009 and 2015/ 2016 by combining the method of stable carbon isotope (~(13)C)and radioactive carbon isotope (~(14)C). The ~(14)C results demonstrate that EC was dominated by fossil sources in 2008/ 2009 and 2015/ 2016, with a mean contribution of 77% ±4% and 72% ±5%. ~(13)C composition of EC was more enriched in 2008/ 2009 (- 23.72‰ ~ - 22.81‰, - 23.22‰ ± 0.39‰)compared to that in 2015/ 2016 (-25.04‰ ~ -24.64 ‰,-24.80‰±0.21‰), indicating the influence of coal combustion in 2008/ 2009 and liquid fossil fuel combustion in 2015/ 2016. By combining ~(14)C and ~(13)C signatures, the change of EC emission sources was significant of Xi'an in the past decade, it was found that the relative contributions from coal combustion to EC decreased, and vehicle emission to EC increased respectively. This is related to the change of coal to gas and the rapid increase of motor vehicles population. |
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来源
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矿物岩石地球化学通报
,2019,38(6):1073-1080 【核心库】
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DOI
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10.19658/j.issn.1007-2802.2019.38.127
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关键词
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碳同位素
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元素碳
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西安
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PM_(2.5)
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地址
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中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安, 710061
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中国科学院气溶胶化学与物理重点实验室, 中国科学院气溶胶化学与物理重点实验室, 西安, 710061
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中国科学院第四纪科学与全球变化卓越创新中心, 中国科学院第四纪科学与全球变化卓越创新中心, 西安, 710061
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1007-2802 |
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学科
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地质学 |
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基金
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国家重点研发计划项目
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文献收藏号
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CSCD:6647052
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