湖沼環境での物質循環に関する研究 –琵琶湖における天然放射性核種<sup>210</sup>Pbと<sup>210</sup>Poの挙動–  [in Japanese] Studies on geochemical cycles in lake environment –Behavior of naturally occurring radionuclides <sup>210</sup>Pb and <sup>210</sup>Po in Lake Biwa, Japan–  [in Japanese]

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Abstract

The behavior of <sup>210</sup>Pb and <sup>210</sup>Po in Lake Biwa, a large mesotorophic lake situated in the Kinki district of Japan, was investigated by analyzing lake water at various depths and precipitation at approximately monthly intervals for a period of 1.5 years, and sediments, streams flowing into and out of the lake. Flux balance calculation indicated that atmospheric deposition was the major source (97% of total) of <sup>210</sup>Pb to the lake, and for <sup>210</sup>Po growth <i>in-situ</i> from the decay of <sup>210</sup>Pb contributed about 75% of the total <sup>210</sup>Po supply to the lake. Most (about 90%) of all the <sup>210</sup>Pb inputs to this lake was found to be incorporated into sediment. Residence times via sedimentation in the epilimnion and hypoliminion were estimated to be 27 (6-40) and 22 (5-45) days, respectively, for <sup>210</sup>Pb and 95 (47-146) and 32 (7-109) days for <sup>210</sup>Po. These residence times suggest that there is a difference between <sup>210</sup>Pb and <sup>210</sup>Po in the extent of their cycling in the water column, with a more rapid removal of <sup>210</sup>Pb than <sup>210</sup>Po. Overall, <sup>210</sup>Pb and <sup>210</sup>Po were, furthermore, found to be removed more efficiently during the transit periods of high biological productivity, such as plankton blooms.

Journal

  • Chikyukagaku

    Chikyukagaku 35(2), 85-106, 2001

    The Geochemical Society of Japan

References:  73

Cited by:  2

Codes

  • NII Article ID (NAID)
    110008680019
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    5812305
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR  J-STAGE 
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