Isotopic mass fractionation of snow due to depth hoar formation

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To clarify the isotopic changes (δD and δ^<18>O) of snow due to depth hoar formation, large temperature gradients were imposed on snow samples using a closed and insulated box for several days. δD and δ^<18>O increased in the high temperature region where sublimation enriched heavy H_2O, and decreased in the low temperature region where light H_2O was concentrated. Isotope diagrams of the data showed slopes of 2.4-4.9,which indicated that isotopic fractionation on sublimation depends on the kinetic isotope effect. It was also suggested that the transfer coefficient of water vapor in snow increases slightly due to convection; and the changes of isotopic profiles depend primary on the snow density as it affects permeability to vapor diffusion.

To clarify the isotopic changes (δD and δ^<18>O) of snow due to depth hoar formation, large temperature gradients were imposed on snow samples using a closed and insulated box for several days. δD and δ^<18>O increased in the high temperature region where sublimation enriched heavy H_2O, and decreased in the low temperature region where light H_2O was concentrated. Isotope diagrams of the data showed slopes of 2.4-4.9,which indicated that isotopic fractionation on sublimation depends on the kinetic isotope effect. It was also suggested that the transfer coefficient of water vapor in snow increases slightly due to convection; and the changes of isotopic profiles depend primary on the snow density as it affects permeability to vapor diffusion.

収録刊行物

  • Polar meteorology and glaciology

    Polar meteorology and glaciology 14, 1-7, 2000-11

    国立極地研究所

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各種コード

  • NII論文ID(NAID)
    110001068160
  • NII書誌ID(NCID)
    AA1129795X
  • 本文言語コード
    ENG
  • 資料種別
    Departmental Bulletin Paper
  • ISSN
    13443437
  • データ提供元
    CJP引用  NII-ELS  IR 
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