北太平洋上エアロゾル中の<sup>210</sup>Pb, <sup>210</sup>Bi and <sup>210</sup>Po  [in Japanese] <sup>210</sup>Pb, <sup>210</sup>Bi and <sup>210</sup>Po in atmospheric aerosols over the North Pacific Ocean  [in Japanese]

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Author(s)

    • 横田 喜一郎 YOKOTA Kiichiro
    • 北海道大学水産学部:(現)新日本気象海洋株式会社 Laboratory of Analytical Chemistry, Department of Chemistry, Faculty of Fisheries, Hokkaido University
    • 角皆 静男 TSUNOGAI Shizuo
    • 北海道大学水産学部 Laboratory of Analytical Chemistry, Department of Chemistry, Faculty of Fisheries, Hokkaido University

Abstract

Atmospheric aerosol samples were collected on board a vessel over the North Pacific Ocean for the period from August to October, 1985, and were analyzed for the daughter nuclides of radon, <sup>210</sup>Pb, <sup>210</sup>Bi and <sup>210</sup>Po. The concentrations of <sup>210</sup>Pb obtained during the cruise from Hawaii to Midway were about 5 dpm/1000m<sup>3</sup>, corresponding to about one-eighth of the annual mean value observed at Okushiri Island (42°N) in Japan. On September 23, a cold front pass at a point of about 29°N, 177°W during the westward cruise. Before passing the cold front the concentration of <sup>210</sup>Pb was lower and the residence time of aerosols calculated from <sup>210</sup>Po/<sup>210</sup>Pb was 48days and that from <sup>210</sup>Bi/<sup>210</sup>Pb was about 14days, while the concentration of <sup>210</sup>Pb was increased and the residence time was largely shortered after the passing. These results suggest that there exists continental aerosols of longer residence time in the maritime air mass, which may be supplied from the upper atmosphere.

Journal

  • Chikyukagaku

    Chikyukagaku 25(1), 59-68, 1991

    The Geochemical Society of Japan

Cited by:  2

Codes

  • NII Article ID (NAID)
    110008679853
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    3737719
  • NDL Source Classification
    M032;ME25
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJPref  NDL  NII-ELS  J-STAGE 
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