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Air-hydrate crystals in deep ice-core samples from Vostok Station, Antarctica
Title: | Air-hydrate crystals in deep ice-core samples from Vostok Station, Antarctica |
Authors: | Uchida, T. Browse this author | Hondoh, T. Browse this author | Mae, S. Browse this author | Lipenkov, V. Ya. Browse this author | Duval, P. Browse this author |
Issue Date: | 1994 |
Publisher: | International Glaciological Society |
Journal Title: | Journal of Glaciology |
Volume: | 40 |
Issue: | 134 |
Start Page: | 79 |
End Page: | 86 |
Abstract: | Microscopic observation of air-hydrate crystals was carried out using 34 deep ice-core samples retrieved at Vostok Station, Antarctica. Samples were obtained from depths between 1050 and 2542m, which correspond to Wisconsin/Sangamon/Illinoian ice. It was found that the volume and number of air-hydrate varied with the climatic changes. The volume concentration of air-hydrate in the interglacial ice was about 30% larger than that in the glacial ice. In the interglacial ice, the number concentration of air-hydrate was about a half and the mean volume of air-hydrate was nearly three times larger than that in the glacial-age ice. The air-hydrate crystals were found to grow in the ice sheet, about 6.7×10^-12cm^3 year^-1, in compensation for the disappearance of smaller ones. The volume concentration of air-hydrate was related to the total gas content by a geometrical equation with a proportional parameter α. The mean value of α below 1250m, where no air bubbles were found, was about 0.79. This coincided with an experimentally determined value of the crystalline site occupancy of the air-hydrate in a 1500m core obtained at Dye 3, Greenland (Hondoh and others, 1990). In the depth profile of calculated α for many samples, α in the interglacial ice was about 30% smaller than that in the glacial-age ice. |
Rights: | © 1994 International Glaciological Society |
Type: | article |
URI: | http://hdl.handle.net/2115/35167 |
Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 内田 努
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