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Study on the crystal structure of deep sections of Antarctic ice cores

Research Project

Project/Area Number 12440077
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionHokkaido University

Principal Investigator

HORI Akira (2002)  Hokkaido Univ., Inst. of Low Temp. Sci., Assist. Prof., 低温科学研究所, 助手 (60280856)

本堂 武夫 (2000-2001)  北海道大学, 低温科学研究所, 教授 (60109494)

Co-Investigator(Kenkyū-buntansha) NARITA Hideki  Hokkaido Univ., Inst. of Low Temp., Assoc. prof., 低温科学研究所, 助教授 (20001662)
深澤 倫子  科学技術振興事業団, 領域研究者
堀 彰  北海道大学, 低温科学研究所, 助手 (60280856)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥14,200,000 (Direct Cost: ¥14,200,000)
Fiscal Year 2002: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2000: ¥6,100,000 (Direct Cost: ¥6,100,000)
Keywordsice core / crystal structure / proton configuration / X-ray diffraction / ice / order-disorder transition / structure / dislocation density / 秩序無秩序転移 / 氷
Research Abstract

Characteristic features in Antarctic ice cores have been observed by Raman and incoherent inelastic neutron spectra, which have been attributed to proton ordering in ice structure. In this study, to elucidate the characteristic crystal structure of ice cores from Antarctica were investigated mainly by X-ray diffraction. The followings are the results in this research:
(1) X-ray diffraction study of structure of ice crystal
X-ray rocking curve measurements were conducted for deep sections of Vostok ice core and the dislocation density was determined from the width of the profiles. The dislocation density decreases from 10^<12>m^<-2> to 10^8 m^<-2>, as depth increases between 3200 and 3611 m. The dislocation density was lower in deepest sections because^the ice was formed by the refreezing of Vostok Lake water in a long period.
(2) X-ray powder diffraction study of crystal structure
The observed profiles by X-ray powder diffraction did show sample or depth dependency. The (1121) reflection w … More hich is characteristic of ordered ice (ice XI) was scarcely observed in any samples. This is because the intensity of this reflection is expected to be very low and, therefore, strong X-ray source like synchrotron radiation is necessary in a further study. X-ray diffuse scattering measurements are also important in the further study.
(3) Lattice constants determined by X-ray powder diffraction
Lattice constants of ice core samples were determined by Reidtveld analysis of X-ray powder diffraction profiles. The lattice constants of ice core samples are larger than that of laboratory ice and increase with the depth although they are expected to be smaller due to residual stress. The origin of this behavior should be investigated in a further study.
(4) Raman Spectra of deformed ice
To reveal the origin of the reported characteristic spectra of Antarctic ice, Raman spectra for deformed ice were measured. However, no significant change was observed. Thus, the deformation of ice in the Antarctic ice sheet is not a possible reason for the characteristic spectra.
(5) Formation process of clathrate hydrate and ice crystal structure
Molecular dynamics simulations elucidated a new diffusion mechanism of gases in ice during clathrate hydrate formation from ice. We first found that in the diffusion process gas forms a characteristic intermediate structure breaking a hydrogen bond between a pair of water molecules. Less

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] T.Hondoh: "Nature and behavior of dislocation in ice"Physics of Ice Core Records, Edited by T.Hondoh Hokkaido University Press. 3-24 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] N.Azuma et al.: "Crystallographic analysis of the Dome Fuji ice core"Physics of Ice Core Records, Edited by T.Hondoh Hokkaido University Press. 456-461 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.N.Salamatin et al.: "Kinetics of air-hydrate nucleation in polar ice sheers"J.Crystal Growth. 223. 283-305 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Ikeda-Fukazawa et al.: "Variation in N_2/O_2 ratio of occluded air in Dome Fuji Antarctic ice"J.Geophys.Res.. 106, No.D16. 17799-17810 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Ikeda-Fukazawa et al.: "Molecular dynamics studies of molecular diffusion in ice Ih"Journal of Chemical Physics. 117. 3886-3896 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Narita et al.: "Estimation of annual layer thickness from stratigraphical analysis of Dome Fuji deep ice core."Mem.Natl.Inst.Polar Res.Special Issue. 57. 38-45 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Hondoh et al.: "Physical Properties of the Dome Fuji Ice Core"Mem.Natl.Inst.Polar Res.Special Issue. 57. 63-71 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.Hori et al.: "Ice lattice distortion along the deepest section of the Vostok core from X-ray diffraction measurements"Annals of Glaciology. 39(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Hondoh: "Nature and behavior of dislocation in ice"Physics of Ice Core Records (Edited by T. Hondoh)(Hokkaido University Press). 3-24 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] N.Azuma et al.: "Crystallographic analysis of the Dome Fuji ice core"Physics of Ice Core Records (Edited by T. Hondoh)(Hokkaido University Press). 456-461 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.N.Salamatin et al.: "Kinetics of air-hydrate nucleation in polar ice sheers"J. crystal Growth. 223. 285-305 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Ikeda-Fukazawa et al.: "Variation in N_2/O_2 ratio of occluded air in Dome Fuji"J. Geophys. Res.. 106, No. D16. 17799-17810 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Ikda-Fukazawa et al.: "Molecular dynamics studies of molecular diffusion in ice Ih"Journal of Chemical Physics. 117. 3886-3896 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Narita et al.: "Estimation of annual layer thickness from stratigraphical analysis of Dome Fuji deep ice core"Mem. Natl. Inst. Polar Res. Special Issue. 57. 38-45 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Hondoh et al.: "Physical Properties of the Dome Fuji Ice Core"Mem. Natl. Inst. Polar Res. Special Issue. 57. 63-71 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.Hori et al.: "Ice lattice distortion along the deepest section of the Vostok core from X-ray diffraction measurements"Annals of Glaciology. 39 (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ikeda-Fukazawa et aL.: "Molecular dynamics studies of molecular diffusion in ice Ih"Journal of Chemical Physics. 117. 3886-3896 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] A.N.Salamatin et al.: "Kinetics of air-hydrate nucleation in polar ice sheets"J. Crystal Growth. 223. 285-305 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Ikeda-Fukazawa et al.: "Variation in N2/O2 ratio of occluded air in Dome Fuji Antarctic ice"J. Geophys. Res.. 106,No.D16. 17,799-17,810 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Hondoh: "Nature and behavior of dislocations in ice, Physics of Ice Core Records, Edited by T. Hondoh"Hokkaido University Press. 3-24 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] N.Azuma et al.: "Crystallographic analysis of the Dome Fuji ice core, Physics of Ice Core Records, Edited by T. Hondoh"Hokkaido University Press. 456-61 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2020-05-15  

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