西部北太平洋における炭素質エアロソルの濃度レベルと発生源  [in Japanese] The concentration levels and sources of particulate carbonaceous substances in the western North Pacific  [in Japanese]

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Author(s)

    • 松本 潔 MATSUMOTO Kiyoshi
    • 東京大学海洋研究所|科学技術振興機構|(現) 神奈川大学工学部応用化学科 Ocean Research Institute, the University of Tokyo|Japan Science and Technology Corporation|(Present address) Department of Applied Chemistry, Kanagawa University Engineering
    • 成田 祥 NARITA Yasushi
    • 東京大学海洋研究所|科学技術振興機構 Ocean Research Institute, the University of Tokyo|Japan Science and Technology Corporation

Abstract

Particulate carbonaceous substances (OC, EC) were observed at Rishiri (45.07°N, 141.12°E) and Hachijo (33.15°N, 139.75°E) simultaneously during the spring (April-May) in 2001. Mean concentrations at two stations were found to be the same levels and similar to the concentration range of previous studies made in the western North Pacific. Using 7-day isentropic backward trajectory analysis and nss-SO<sub>4</sub><sup>2-</sup> data, the sources and the path-ways of air masses were evaluated. It was found that the concentrations of OC and EC were high and there was a good correlation between EC and nss-SO<sub>4</sub><sup>2-</sup> in the case of air masses from the East Asian region since the dominant source was fossil fuel combustion in industrial regions in the Asian continent. Particularly biomass burning made EC/nss-SO<sub>4</sub><sup>2-</sup> ratio higher in the case of air masses from Siberia region. The OC/EC ratios of the same air mass origin from the East Asian region at the two stations had differences, which suggests that the indicator of OC/EC to evaluate the origin has a large uncertainty. In this study, we found that NVOC (volatilized OC between 200-340℃) /EC ratio can be a good indicator to identify the sources of OC and EC. And VOC (volatilized OC below 200℃) /EC ratio may be found to be an indicator for a secondary OC.

Journal

  • Chikyukagaku

    Chikyukagaku 38(3), 117-125, 2004

    The Geochemical Society of Japan

References:  25

Codes

  • NII Article ID (NAID)
    110008680074
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    0386-4073
  • NDL Article ID
    7073704
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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