Abstract The marine aerosols is mainly produced primary sea salt and secondary form of non-sea salt (nss) sulfate and organic species from marine emission, but get modified significantly by the anthropogenic and terrestrial materials, such as total carbon (TC) and total nitrogen (TN), which transported by the atmospheric circulation from land to the ocean. Rarely studies focus on the TC and TN in marine aerosol in the open ocean due to the sampling difficulty, let alone the annual observation. Concentrations of TC and TN, and their isotope compositions (δ13C-TC and δ15N-TN) were measured in total suspended particulate (TSP) which sampled at Yongxing Island over the South China Sea from March 2014 to February 2015, and coastal mega-city Guangzhou in April/May and October/November 2014. The annual average concentrations of TC and TN at Yongxing Island were 4.20 ± 2.38 μg m−3 and 0.77 ± 0.47 μg m−3, respectively. Much higher concentration of TC and TN were observed at Guangzhou. Contributions of NO3− and NH4+ (inorganic nitrogen, IN) to TN at Yongxing Island averaged 55.7% and 6.8%, respectively, while they averaged 27.4% and 12.2% at Guangzhou, respectively. The average values of δ15N in TN were +0.7 ± 3.3‰, +6.8 ± 6.3‰ and −0.7 ± 2.7‰ during winter, transitional and warm seasons, respectively, with an annual average value of +1.1 ± 4.3‰. The δ13C of TC varied from −16.2 to −26.8‰, with an annual average value of −22.7‰. The average of values of δ13C were −22.9 ± 1.7‰, −22.9 ± 1.4‰, and −22.4 ± 2.6‰ during winter, transitional and warm seasons, respectively. The average values of δ15N in TN and δ13C of TC were +13.2 ± 0.9‰ and −25.8 ± 0.4‰ in winter season, +13.6 ± 0.8‰ and - 26.5 ± 0.3‰ in warm season at Guangzhou, respectively. Based on aerosol δ15N and δ13C values, the marine realm may be an important source of aerosol TN, while aerosol TC may dominantly contributed by the combustion of fossil fuels and biomass burning from continental mass over the South China Sea. The secondary aerosol formation and long-range transport on aerosol chemistry also varied the concentrations and isotopic composition of TN and TC at Yongxing Island.

中文翻译：

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南海上空散装气溶胶样品的稳定碳氮同位素组成

摘要 海洋气溶胶主要由海洋排放产生的原生海盐和次生非海盐（nss）硫酸盐和有机物组成，但受到人为和陆地物质的显着修饰，如总碳（TC）和总氮。 (TN)，通过大气环流从陆地输送到海洋。由于采样困难，很少有研究集中在公海海洋气溶胶中的TC和TN，更不用说每年的观测了。2014 年 3 月至 2015 年 2 月在南海永兴岛和沿海大城市采样的总悬浮颗粒物 (TSP) 中测量了 TC 和 TN 的浓度及其同位素组成（δ13C-TC 和 δ15N-TN） 2014年4月/5月和10月/11月的广州。永兴岛TC和TN年平均浓度分别为4.20±2.38 μg m-3和0.77±0.47 μg m-3。在广州观察到更高浓度的 TC 和 TN。永兴岛NO3−和NH4+（无机氮，IN）对TN的贡献分别平均为55.7%和6.8%，而广州分别为27.4%和12.2%。TN中δ15N平均值在冬季、过渡期和暖季分别为+0.7±3.3‰、+6.8±6.3‰和-0.7±2.7‰，年平均值为+1.1±4.3‰。TC的δ13C变化范围为-16.2～-26.8‰，年平均值为-22.7‰。冬季、过渡期和暖季的δ13C平均值分别为-22.9±1.7‰、-22.9±1.4‰和-22.4±2.6‰。TN中δ15N和TC中δ13C的平均值为+13.2±0。广州冬季分别为9‰和-25.8±0.4‰，暖季分别为+13.6±0.8‰和-26.5±0.3‰。根据气溶胶 δ15N 和 δ13C 值，海洋领域可能是气溶胶 TN 的重要来源，而气溶胶 TC 可能主要由化石燃料燃烧和南海上空大陆物质燃烧的生物量贡献。气溶胶化学的二次气溶胶形成和远距离传输也改变了永兴岛TN和TC的浓度和同位素组成。而气溶胶 TC 的主要贡献可能是化石燃料的燃烧和南海上空大陆物质的生物质燃烧。气溶胶化学的二次气溶胶形成和远距离传输也改变了永兴岛TN和TC的浓度和同位素组成。而气溶胶 TC 的主要贡献可能是化石燃料的燃烧和南海上空大陆物质的生物质燃烧。气溶胶化学的二次气溶胶形成和远距离传输也改变了永兴岛TN和TC的浓度和同位素组成。