Effects of air-hydrate crystals on ice grain growth

Microscopic observations of air-hydrate crystals in Vostok ice cores, Antarctica, revealed that air-hydrate crystals acted as obstacles to the grain boundary migration. About half of the air-hydrate crystals were observed to be located on the grain boundaries; their volume concentrations were more t...

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Bibliographic Details
Main Authors: Tsutomu Uchida, Shinji Mae, Takeo Hondoh, Paul Duval, Volodya Ya. Lipenkov
Format: Report
Language:English
Published: Government Industrial Development Laboratory 1993
Subjects:
Antarc*
Antarctica
Polar meteorology and glaciology
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology
Online Access:https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3774
http://id.nii.ac.jp/1291/00003774/
https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3774&item_no=1&attribute_id=18&file_no=1
Description
Summary:Microscopic observations of air-hydrate crystals in Vostok ice cores, Antarctica, revealed that air-hydrate crystals acted as obstacles to the grain boundary migration. About half of the air-hydrate crystals were observed to be located on the grain boundaries; their volume concentrations were more than (10)^3 times larger than dust concentration (J. R. PETIT et al., Nature, 326,62,1990). The presence of air-hydrate crystals on grain boundary was considered to reduce effectively the ice grain growth rate. However, air-hydrate crystals did not result in marked changes in grain size associated with climate transitions.

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