Hostname: page-component-6bf8c574d5-vmclg Total loading time: 0 Render date: 2025-02-22T15:36:31.090Z Has data issue: false hasContentIssue false
  • English
  • Français

Dielectric Properties of Deep Ice Cores with Air-Hydrate Inclusions (Abstract)

Published online by Cambridge University Press:  20 January 2017

Shinji Mae ,
Takeo Hondoh ,
Masayoshi Nakawo  and
C.C. Langway Jr
Shinji Mae
Affiliation:
Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060, Japan
Takeo Hondoh
Affiliation:
Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060, Japan
Masayoshi Nakawo
Affiliation:
Department of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo 060, Japan
C.C. Langway Jr
Affiliation:
Department of Geological Sciences, State University of New York at Buffalo, 4240 Ridge Lea Road, Amherst, NY 14226, U.S.A.
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Air-hydrate inclusions have been found in deep ice cores from Dye 3, Greenland, which were taken in August 1981. Although the concentration of the air-hydrate crystals decreased with time, when the core was stored at a temperature of −50 °C, they still existed to an appreciable extent in 1985.

An ice specimen was cut out from the Dye 3 core at a depth of 1500 m, where the volume fraction of the hydrate crystals was about 10−3 by volume. Its dielectric properties were measured in September 1985, in a frequency range of 30-20 × 103 Hz and temperature range of −20° to −90°C. The activation energy obtained for the relaxation time of the Debye dispersion was about 0.2 eV, which is much smaller than that of pure ice.

The measurement was repeated once a month for about a year, and the sample was stored at a temperature of −10 °C between measurements. The time variation of the dielectric properties has been discussed in relation to the deterioration of the air-hydrate crystals.

Type
Abstract
Information
Annals of Glaciology , Volume 10 , 1988 , pp. 210
Copyright
Copyright © International Glaciological Society 1988