State Key Laboratory of Marine Environmental Science, College of the Environment & Ecology , Xiamen University , Xiamen , 361102 , China.
National Ocean Sciences Accelerator Mass Spectrometry Facility, Department of Geology and Geophysics , Woods Hole Oceanographic Institution , Woods Hole , Massachusetts 02543 , United States.
Environ Sci Technol. 2018 Jul 3;52(13):7307-7316. doi: 10.1021/acs.est.8b01331. Epub 2018 Jun 14.
On the basis of the application of compound-specific radiocarbon analysis (CSRA) and air-water exchange models, the contributions of fossil fuel and biomass burning derived polycyclic aromatic hydrocarbons (PAHs) as well as their air-water transport were elucidated. The results showed that fossil fuel-derived PAHs (an average contribution of 89%) presented the net volatilization process at the air-water interface of the Taiwan Strait in summer. Net volatile fluxes of the dominant fluorene and phenanthrene (>58% of the total PAHs) were 27 ± 2.8 μg m day, significantly higher than the dry deposition fluxes (average 0.43 μg m day). The ΔC contents of selected PAHs (fluorene, phenanthrene plus anthracene, fluoranthene, and pyrene) determined by CSRA in the dissolved seawater ranged from -997 ± 4‰ to -873 ± 6‰, indicating that 89-100% (95 ± 4%) of PAHs were supplied by fossil fuels. The South China Sea warm current originating from the southwest China in summer (98%) and the Min-Zhe coastal current originating from the north China in winter (97%) input more fossil fuel PAHs than the Jiulong River estuary (90%) and Xiamen harbor water (93%). The more radioactive decayed C of fluoranthene (a 4-ring PAH) than that of phenanthrene and anthracene (3-ring PAHs) represented a greater fossil fuel contribution to the former in dissolved seawater.
基于复合特异性放射性碳分析（CSRA）和空气-水交换模型的应用，阐明了化石燃料和生物质燃烧衍生的多环芳烃（PAHs）及其空气-水传输的贡献。结果表明，在夏季台湾海峡的气-水界面上，化石燃料衍生的 PAHs（平均贡献 89%）呈现净挥发过程。芴和菲（占总 PAHs 的>58%）的主要挥发性通量为 27±2.8μg m day，明显高于干沉降通量（平均 0.43μg m day）。通过 CSRA 在溶解海水中测定的选定 PAHs（芴、菲加蒽、荧蒽和芘）的ΔC 含量范围为-997±4‰至-873±6‰，表明 89-100%（95±4%）的 PAHs 来自化石燃料。夏季源自中国西南的南海暖流（98%）和源自中国北方的闽浙沿岸流（97%）比九龙江河口（90%）和厦门港水（93%）输入更多的化石燃料 PAHs。芴（四环 PAH）的放射性衰变 C 比菲和蒽（三环 PAHs）多，这代表溶解海水中前者有更大的化石燃料贡献。
