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Studies of the change on the composition and the optical properties of solid implities in deposited snow

Research Project

Project/Area Number 07458119
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionNagoya University

Principal Investigator

NAKAWO Masayoshi (1996)  Institute for Hydrospheric-Atmospheric Sciences, Nagoya University, Associate Professor, 大気水圏科学研究所, 助教授 (90142695)

瀬古 勝基 (1995)  名古屋大学, 大気水圏科学研究所, 助手 (70196971)

Co-Investigator(Kenkyū-buntansha) OSADA Kazuo  Solar-Terrestrial Environment Laboratory, Nagoya University, Research Associate, 太陽地球環境研究所, 助手 (80252295)
KOHSHIMA Shiro  Faculty of Science, Tokyo University of Technology, Associate Professor, 理学部, 助教授 (60183802)
中尾 正義  名古屋大学, 大気水圏科学研究所, 助教授 (90142695)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1995: ¥7,000,000 (Direct Cost: ¥7,000,000)
KeywordsDeposited snow / Snow melt / Solid impurities / Optical characteristics / Mineral particles / Snow algae / 固体不純物 / 積雪中の不純物 / 微生物 / アルビードスペクトル / 氷河 / 組成と光学的性質 / 固体粒子の組成
Research Abstract

Impurities on the snow surfaces would decrease the albedo and accordingly accelerate the rate of melting significantly through their aggregation, which is one of the most important roles, in particular of solid impurities such as mineral and biological particles. It is of great importance to observe their optical characteristics in detail, and to analyze quantitatively the relations between the dynamic abundance of impurities, their optical role in terms of energy budget and rate of snow melt.
In this study, first of all, the role of mineral dust has been examined experimentally. It was found that the impurities tend to aggregate, as the melting proceeds, and the albedo increases resulting in retarding the rate of melting. In other words, the surface dust has an effect of negative feed back in snow melt. In case for glacier ice, the surface runoff of melt water accelerated the effect. This effect has been successfully incorporated in a snow melt model. For biological dust (snow algae), the effect of reproduction, which is a function of abundance of water, light and nutrient, make the process very complex. The conservation law does not hold in this case, when we look at the biomass only. It was not possible, therefore, to incorporate the process in the snow melt model. It was found, however, that the biological particles can be a good indicator for identifying annual layrs, which is of great use in ice core analysis.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] K. Seko, Y. Yoshimura, and S. Kohshima: "Problems and possibilities of Asian ice core dating method, including bioglaciological approach." Proceedings of the 1995 Nagoya IGBP-PAGES/PEP-II symposium. 242-247 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 瀬古勝基、ビルバル・ラナ: "サロマ湖96観測" 衛星によるオホーツク海氷のプログラムワークショップ報告書. 186-190 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Adhikary, S., K. Seko, M. Nakawo, Y. Ageta and N. Miyazaki: "Effect of surface dust on snow melt." Bulletin of Glacier Research. 15 (in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yoshimura, Y. and S., Kohshima: "A community of snow algae on a Himalayan glacier : change of algal biomass and community structure with altitude." Arctic and Alpine Research. 29 (in press). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Seko, K., Y.Yoshimura and S.Kohshima: "Problems and possibilities of Asian ice core dating method, including bioglaciological approach." Proceedings of the 1995 Nagoya IGBP-PAGES-PEP-II. 242-247 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Adhikary, S., K.Seko, M.Nakawa, Y.Ageta and N.Miyazaki: "Effect of surface dust on snow melt." Bulletin of Glacier Research. 15, (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Yoshimura, Y.and S.Kohshima: "A community of snow algae on a Himalayan glacier : change of algal biomass and community structure with altitude." Arctic and Alpine Research. 29, (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Seko,Y.Yoshimura,and S.Kohshima: "Problems and possibilities of Asian ice core dating method,including bioglaciological approach." Proceedings of the 1995 Nagoya IGBP-PAGES/PEP-II symposium. 242-247 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 瀬古勝基、ビルバル・ラナ: "サロマ湖96観測" 衛星によるオホーツク海氷のプログラムワークショップ報告書. 186-190 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Adhikary,S.,K.Seko,M.Nakawo,Y.Ageta and Miyazaki: "Effect of surface dust on snow melt." Bulletin of Glacier Research. 15(in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Yoshimura,Y.and S.,Kohshima: "A community of show algae on a Himalayan glacier:change of algal biomass and community structure with altitude." Arctic and Alpine Research. 29(in press). (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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