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Formation of air clathrate hydrates in polar ice sheets : heterogeneous nucleation induced by micro-inclusions

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Title: Formation of air clathrate hydrates in polar ice sheets : heterogeneous nucleation induced by micro-inclusions
Authors: Ohno, Hiroshi Browse this author
Lipenkov, Vladimir Ya. Browse this author
Hondoh, Takeo Browse this author
Issue Date: Dec-2010
Publisher: International Glaciological Society
Journal Title: Journal of Glaciology
Volume: 56
Issue: 199
Start Page: 917
End Page: 921
Publisher DOI: 10.3189/002214310794457317
Abstract: To investigate factors influencing nucleation of air clathrate hydrates in polar ice sheets, we have performed high-resolution mapping of the distributions of soluble impurities, air bubbles and air-hydrate crystals versus depth in the Dome Fuji Antarctic ice. Significant correlation observed between the concentrations of air inclusions and impurities in ice along with frequent occurrence of impurities inside hydrate crystals suggest that micro-inclusions promote hydrate nucleation in the ice matrix. Our observations also show that the diffusive macroscopic-scale redistribution of air constituents in ice in the bubble-hydrate transition zone is controlled by the original sedimentary layering of soluble impurities acting as nucleation helpers. The results of this study are important for the correct interpretation of high-resolution gas analyses of ice cores and for better understanding the global bubble-to-hydrate transformation process in polar ice sheets.
Rights: © 2010 International Glaciological Society
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 本堂 武夫

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