基于14C和有机分子示踪剂的长江三角洲地区有机气溶胶源分析

IF 3.4 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Changliu Wu, Fang Cao, Yuxian Zhang, Wenhuai Song, Qianli Ma, Xiaofang Jia, Lei Ren, Xiaoying Yang, Mingyuan Yu, Sönke Szidat, Yanlin Zhang
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引用次数: 0

摘要

为了明确人为和生物源对背景大气有机气溶胶(OA)的相对重要性,在中国长江三角洲(YRD)地区,通过双碳同位素(14C和13C)和有机示踪剂的测量,量化了细颗粒物(PM2.5)中化石和非化石源对初级和次级OA的贡献。非化石源有机碳(OC)占主导地位,平均贡献率为58±9%。生物源排放在春季(68±29%)和夏季(86±6%)占主导地位,而生物质燃烧排放在冬季(87±15%)和秋季(51±8%)占主导地位。春季(58±23%)和夏季(64±21%)以上的生物源OC来源于次生形成,其中单萜(35±16%)和异戊二烯(49±25%)分别是次生有机气溶胶(SOA)的主要前体。有机碳对碳的贡献最大,平均贡献率为71±9%。此外,冬季(93±7%)和秋季(74±5%)的人为OC显著偏高,表明区域污染输送对本底气溶胶的影响显著。人为污染物与生物源有机碳的相关性表明,人为和生物源排放的混合贡献促进了SOA的形成。这种相互作用可以部分解释长三角洲地区背景站点的非化石有机碳(>60%)和化石有机碳(>70%)相对于其他全球背景站点较高的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Source Apportionment of Organic Aerosol Using 14C and Organic Molecular Tracers at a Regional Background Site of the Yangtze River Delta Region, China

To clarify the relative importance of anthropogenic and biogenic sources on organic aerosol (OA) in the background atmosphere, fossil and nonfossil contributions to both primary and secondary OA in fine aerosols (PM2.5) were quantified at the regional receptor site in the Yangtze River Delta (YRD) region of China by measurements of dual-carbon isotopes (14C and 13C) and organic tracers. Nonfossil sources dominated organic carbon (OC) with an average contribution of 58 ± 9%. Biogenic emissions dominated nonfossil OC during spring (68 ± 29%) and summer (86 ± 6%), while biomass burning emissions dominated in winter (87 ± 15%) and autumn (51 ± 8%). More than half of the biogenic-derived OC in spring (58 ± 23%) and summer (64 ± 21%) originated from secondary formation, with monoterpene (35 ± 16%) and isoprene (49 ± 25%) as main secondary organic aerosol (SOA) precursors, respectively. The SOC contributed the most anthropogenic-derived (i.e., fossil and biomass burning sources) OC with an average contribution of 71 ± 9%. In addition, anthropogenic OC was notably high during winter (93 ± 7%) and autumn (74 ± 5%), underscoring the significant impact of regional pollution transport on background aerosol. Correlations between anthropogenic pollutants and biogenic-derived SOC indicated that mixed contributions from anthropogenic and biogenic emissions promoted SOA formation. This interaction may partially explain the relatively higher fractions of SOC in nonfossil (>60%) and fossil OC (>70%) at the background site of the YRD region compared to other global background sites.

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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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