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Normal saturated monocarboxylic acids were detected in the range of C_8-C_\u003c28\u003e (3.4-8.1 (ngm)^\u003c-3\u003e). Their distribution showed a maximum at C_\u003c16\u003e with an even carbon number predominance, except for C_9 which was more abundant than C_8 and C_\u003c10\u003e. The lower molecular weight (C_\u003c12\u003e-C_\u003c19\u003e) monocarboxylic acids dominate in the Antarctic aerosols, suggesting that the organic aerosols mainly orginate from marine organisms through sea-to-air emissions and subsequent atmospheric transport over Antarctica. However, unsaturated monocarboxylic acids (C_\u003c16 : 1\u003e, C_\u003c18 : 1\u003e; 0.40-0.91 (ngm)^\u003c-3\u003e), which are much more abundant than the saturated ones in marine algae and sea surface microlayers, were detected at relatively low concentrations. Depletion of unsaturated acids in the aerosols can be explained by selective photochemical degradation of the acids in the atmosphere. This is consistent with the relatively abundant presence of C_9 monoacid, which is a photooxidation product of unsaturated fatty acids such as oleic acid. The depletion of unsaturated fatty acids is also supported by the abundant presence of C_9α, ω-dicarboxylic acid (azelaic acid), which is a specific counterpart of photooxidation of unsaturated fatty acid containing a double bond predominantly at the C-9 position. Relative abundance of azelaic acid carbon content in total aerosol carbon content (TC) was found to be positively correlated with solar radiation, suggesting that the photochemical transformation of the Antarctic aerosols is intensified in summer. Mid-chain oxocarboxylic acids (4-oxooctanoic and 4-oxononanoic acids; 0.4-1.0 (ngm)^\u003c-3\u003e) were also detected in the Antarctic aerosols. 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DISTRIBUTIONS OF LIPID CLASS COMPOUNDS IN ANTARCTIC AEROSOLS COLLECTED AT SYOWA STATION
https://doi.org/10.15094/00003948
https://doi.org/10.15094/00003948adc446bd-ab0f-41fe-a9a5-740433535325
名前 / ファイル | ライセンス | アクション |
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KJ00000768009 (91.3 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1996-09-01 | |||||
タイトル | ||||||
タイトル | DISTRIBUTIONS OF LIPID CLASS COMPOUNDS IN ANTARCTIC AEROSOLS COLLECTED AT SYOWA STATION | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00003948 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
記事種別(英) | ||||||
en | ||||||
ABSTRACT | ||||||
論文名よみ | ||||||
その他のタイトル | DISTRIBUTIONS OF LIPID CLASS COMPOUNDS IN ANTARCTIC AEROSOLS COLLECTED AT SYOWA STATION | |||||
著者名よみ |
ニシキオリ, ムツミ
× ニシキオリ, ムツミ× カワムラ, キミタカ× ハヤシ, マサヒコ |
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著者名(英) |
NISHIKIORI, Mutsumi
× NISHIKIORI, Mutsumi× KAWAMURA, Kimitaka× HAYASHI, Masahiko |
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著者所属(英) | ||||||
en | ||||||
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University:(Present address)Institute of Low Temperature Science, Hokkaido University | ||||||
著者所属(英) | ||||||
en | ||||||
Solar-Terrestrial Environment Laboratory, Nagoya University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Antarctic aerosol samples collected from Syowa Station were studied for the molecular distributions of saturated and unsaturated monocarboxylic acids, α, ω-dicarboxylic acids and oxocarboxylic acids using capillary gas chromatography (GC) and GC/mass spectrometry (GC/MS). Normal saturated monocarboxylic acids were detected in the range of C_8-C_<28> (3.4-8.1 (ngm)^<-3>). Their distribution showed a maximum at C_<16> with an even carbon number predominance, except for C_9 which was more abundant than C_8 and C_<10>. The lower molecular weight (C_<12>-C_<19>) monocarboxylic acids dominate in the Antarctic aerosols, suggesting that the organic aerosols mainly orginate from marine organisms through sea-to-air emissions and subsequent atmospheric transport over Antarctica. However, unsaturated monocarboxylic acids (C_<16 : 1>, C_<18 : 1>; 0.40-0.91 (ngm)^<-3>), which are much more abundant than the saturated ones in marine algae and sea surface microlayers, were detected at relatively low concentrations. Depletion of unsaturated acids in the aerosols can be explained by selective photochemical degradation of the acids in the atmosphere. This is consistent with the relatively abundant presence of C_9 monoacid, which is a photooxidation product of unsaturated fatty acids such as oleic acid. The depletion of unsaturated fatty acids is also supported by the abundant presence of C_9α, ω-dicarboxylic acid (azelaic acid), which is a specific counterpart of photooxidation of unsaturated fatty acid containing a double bond predominantly at the C-9 position. Relative abundance of azelaic acid carbon content in total aerosol carbon content (TC) was found to be positively correlated with solar radiation, suggesting that the photochemical transformation of the Antarctic aerosols is intensified in summer. Mid-chain oxocarboxylic acids (4-oxooctanoic and 4-oxononanoic acids; 0.4-1.0 (ngm)^<-3>) were also detected in the Antarctic aerosols. We propose that mid-chain oxocarboxylic acids are possible intermediates to the production of low molecular weight diacids such as succinic acid (C_4), which have been abundantly detected in the Antarctic aerosols. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10756213 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology 巻 10, p. 163, 発行日 1996-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |