HISTORICAL RECORDS OF FATTY ACIDS IN AN ICE CORE FROM SITE-J, GREENLAND
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概要
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Homologs of normal and branched chain saturated fatty acids, as well as unsaturated fatty acids, were determined in an ice core (205m long) taken from Site-J, Greenland using capillary gas chromatography and mass spectrometry. Molecular distributions of normal saturated fatty acids (C_8-C_<32>) were characterized by an even carbon number predominance with two maxima at C_<16> and C_<24> or C_<22>, suggesting that they are transported long range through the atmosphere over Greenland from both marine and continental biological sources. Unsaturated fatty acids (C_<14>-C_<22>) were abundantly detected in the ice samples with oleic acid (C_<18 : 1>) being predominant. This is in contrast to the remote marine aerosols in which unsaturated fatty acids are depleted due to photochemical oxidation, suggesting that the fatty acids settled down in the Greenland ice sheet without serious photochemical degradation during atmospheric transport. Concentrations of the fatty acids (C_<12>-C_<32>) in the ice core fluctuated in the range of 3.9-104μg/kg-ice with higher values at around 1800,1900-1950,and 1980 AD. Relative abundances of the higher molecular weight fatty acids (C_<20>-C_<32>) were higher (10-30% of total fatty acids) in 1700-1850 AD, and lower (5-8%) in 1920-1950 AD. These results suggest that atmospheric transport of continentally derived materials over Greenland was relatively enhanced in 1700-1850 AD, whereas the transport of marine derived organic matter was significantly intensified in 1920-1950 AD.
- 国立極地研究所の論文
著者
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Watanabe Okitsugu
National Institute of Polar Research, Research Organization of Information and Systems
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Fujii Yoshiyuki
National Institute of Polar Research, Research Organization of Information and Systems
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Kawamura Kimitaka
Department Of Chemistry Faculty Of Science Tokyo Metropolitan University
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Kawamura Kenji
Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
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Watanabe Okitsugu
National Institute Of Polar Research
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Kamiyama Kokichi
National Institute Of Polar Research
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Fujii Yoshiyuki
National Institute Of Polar Research
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SUZUKI Ikuko
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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Suzuki Ikuko
Department Of Chemistry Faculty Of Science Tokyo Metropolitan University
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Kawada Kunio
Department Earth Science Toyama University
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Fujii Y
National Inst. Polar Res. Tokyo
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