Stable isotopes in snow on sea ice observed by the Arctic expedition on foot

  • ICHIYANAGI Kimpei
    Graduate School of Science and Technology, Kumamoto University Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology
  • OGITA Yasunaga
    Yasunaga Ogita North Pole office
  • TANOUE Masahiro
    Graduate School of Science and Technology, Kumamoto University

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  • 北極徒歩探検によって観測された海氷上の雪の安定同位体比
  • ホッキョク トホ タンケン ニ ヨッテ カンソク サレタ カイヒョウ ジョウ ノ ユキ ノ アンテイ ドウイタイヒ

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Abstract

Stable isotopes in snow on sea ice were observed in the Canadian Arctic Sea. Twenty-three snowpack and four new snow samples were collected along the length of expedition on foot from March to May in 2011. Stable isotopes in snow ranged from -25 to -35‰ in δ18O and from 3 to 13‰ in d-excess, and the local meteoric water line (LMWL) is δD=8.4*δ18O+18.7. There are no relationships between δ18O in snow and surface air temperature in this study. Temporal variation of δ18O in snow is influenced by the direction of moisture flux, low (high) δ18O in snow exists when southwesterly (northerly or easterly) moisture flux dominants.

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