Origins of free and combined amino acids in the aerosols at an inland urban site in Japan
Origins of free and combined amino acids in the aerosols at an inland urban site in Japan
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DOI：
10.1016/j.atmosenv.2021.118543
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发表时间：
2021-06
影响因子：
5
通讯作者：
K. Matsumoto;Sungben Kim;A. Hirai
中科院分区：
文献类型：
--
作者：
K. Matsumoto;Sungben Kim;A. Hirai
对日本城市气溶胶中的游离氨基酸(FAA)和结合氨基酸(CAA)进行了全年观测。粗粒气溶胶中总游离氨基酸和总氨基酸的平均浓度分别为149.9和237.6 pmolN m−3，细粒气溶胶中的平均浓度分别为177.9和562.2 pmolN m−3。在两种模式范围内，总CAA浓度均高于总FAA浓度。CAA主要分布在精细模式范围内，而FAA主要分布在两个模式范围内，浓度水平相近。这些氨基酸对细粒气溶胶中的水溶性有机氮(WSON)的贡献率仅为8.1%，而对粗粒气溶胶中WSON的贡献率为26.4%。相关分析和因子分析包括这些氨基酸和气溶胶和气相中的其他化学物种，以讨论这些氨基酸的潜在来源。植物残渣及其相关物质、海盐和亚洲尘埃颗粒将是粗模FAA的重要潜在来源。粗气溶胶中最主要的FAA是丝氨酸，被认为来自海盐和亚洲沙尘颗粒，而粗气溶胶中的其他主要FAA将来自植物残渣和相关物质。粗模CAA也可以认为主要来自植物残渣和相关材料。粗模CAA以谷氨酸和天冬氨酸为主，推测为谷氨酸和天冬氨酸。细模FAA的很大一部分将来自亚洲大陆污染气团中细模CAA的光化学老化。在精细模式FAA中，甘氨酸和精氨酸占主导地位，估计来自于光化学老化过程。精细模式的CAA主要来自化石燃料和生物质燃烧粒子，既有来自亚洲大陆的，也有来自当地的。细模式CAA以谷氨酸和甘氨酸为主，并将主要来自这些来源，特别是亚洲大陆来源。然而，丝氨酸是精细模式CAA中最主要的化合物，被认为来自其他不明来源。
A year-round observation of the free amino acids (FAA) and combined amino acids (CAA) in coarse and fine aerosols were conducted at an urban site in Japan. The averaged concentrations of the total FAA and total CAA measured in this study were 149.9 and 237.6 pmolN m−3, respectively, in coarse aerosols, and 177.9 and 562.2 pmolN m−3, respectively, in fine aerosols. The concentrations of the total CAA were higher than those of the total FAA in both mode ranges. The CAA were mainly partitioned into the fine-mode range, whereas the FAA were contained in both mode ranges with a similar concentration level. Only 8.1% of the water-soluble organic nitrogen (WSON) in fine aerosols was explained by these amino acids, although a significant contribution (26.4%) of them to the WSON was found in coarse aerosols. Correlation and factor analyses including these amino acids and other chemical species in the aerosols and gas phase were conducted to discuss potential sources of these amino acids. Plant debris and their associated materials, sea-salt, and Asian dust particles would be important potential sources of the coarse-mode FAA. The most dominant FAA in coarse aerosols was serine that is considered to be derived from sea-salt and Asian dust particles, whereas the other major FAA in coarse aerosols would be from plant debris and associated materials. The coarse-mode CAA can be also considered to be mainly from plant debris and associated materials. Glutamic acid and aspartic acid were dominant in the coarse-mode CAA, and estimated to be from these sources. Significant parts of the fine-mode FAA would be derived from the photochemical aging of the fine-mode CAA in polluted air masses from the Asian continent. Glycine and arginine were dominant in the fine-mode FAA, and estimated to be from the photochemical aging process. The fine-mode CAA is considered to be mainly from both the fossil fuel and biomass burning particles from both the Asian continental and local sources. Glutamic acid and glycine were dominant in the fine-mode CAA, and would be mainly from these sources, especially the Asian continental sources. Serine that is the most dominant compound in the fine-mode CAA, however, is considered to be derived from other unidentified sources.