Compound specific radiocarbon and δ13C measurements of fatty acids in a continental aerosol sample

• Matsumoto, Kohei

• Kawamura, Kimitaka

• Uchida, Masao

• Shibata, Yasuyuki

• Yoneda, Minoru

抄録

Compound-specific radiocarbon analysis of individual fatty acids was conducted for a semi-urban aerosol sample using a preparative capillary gas chromatography (PCGC) system and an accelerator mass spectrometry (AMS). The aerosol fatty acids (C16 to C34) showed a typical bimodal distribution with two maxima at C16 and C26. Their carbon isotopic compositions ranged from -30.3 ‰ (C26) to -23.3 ‰ (C18), suggesting that they are derived from terrestrial higher plants and marine sources. Radiocarbon measurements of C16-C22 fatty acids showed modern 14C ages, suggesting that the acids are emitted from living higher plants and possibly from marine organisms. On the other hand, C24-C26 fatty acids that are characteristic to terrestrial plant waxes showed 14C ages of 5860 (±200) years. This suggests that some portion of higher molecular weight fatty acids have been stored in geochemical reservoirs such as soils at least for hundreds to thousands of years and then emitted to the atmosphere. These aged fatty acids could be in part transported long distances from the Asian continent through the atmosphere.

収録刊行物

• Geophysical Research Letters

  Geophysical Research Letters 28 (24), 4587-4590, 2001-12-15

  American Geophysical Union

キーワード

• 0305 Atmospheric composition and structure
• Aerosols and particles (0345, 4801) 0330 Geochemical cycles 1055 Geochemistry (new field, replaces rock chemistry)
• Organic geochemistry 4860 Oceanography: biological and chemical
• Radioactivity and radioisotopes

詳細情報

• CRID: 1050282813966062976
• NII論文ID: 120000972346
• HANDLE: 2115/26139
• ISSN: 00948276
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles