The reduction of chloride ion concentration in basal ice near Hamna Icefall, East Antarctica

• IIZUKA Y.

  National Institute of Polar Research

• Satake Hiroshi

  Department of Environmental Chemistry and Biology, Toyama University

• Watanabe Okitsugu

  National Institute of Polar Research

抄録

The present paper mainly discusses chloride ions (Cl^-) in debris-laden basal ice near Hamna Icefall, Queen Maud Land, East Antarctica. The basal ice consists of alternating layers of bubble-free and bubbly ice of the order of mm to cm in thickness. Detailed analyses of Cl^- and stable isotopes (δ^<18>O and δD) on the alternating layers were performed. The Cl^- concentrations in the bubble-free ice layers and in the bubbly ice layers whose isotopic fluctuations decrease from neighboring bubble-free ice layers are reduced compared to those in the bubbly ice layers having quasi-neutral values on the isotopic profile. The reduction of Cl concentration in frozen ice compared to that in pre-freezing water was also observed from an experiment on ion fractionation by freezing. These results suggest that the bubble-free ice layers and the bubbly ice layers whose isotopic fluctuation is decreased from that in neighboring bubble-free ice layers were formed by melt-refreezing processes. The reduction of Cl concentration in the basal ice is considered to be an indicator to distinguish whether the basal ice has experienced melt-refreezing or not.

収録刊行物

• Proc. NIPR Symp. Polar Meteorol.

  Proc. NIPR Symp. Polar Meteorol. 15 107-113, 2001

  国立極地研究所

詳細情報

• CRID: 1571698601852575744
• NII論文ID: 110001068181
• NII書誌ID: AA1129795X
• ISSN: 13443437
• 本文言語コード: en
• データソース種別:
  • CiNii Articles