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Formation of air clathrate hydrates in polar ice sheets : heterogeneous nucleation induced by micro-inclusions
| 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 |
| Relation: | http://www.igsoc.org/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/45540 |
| 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)
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Submitter: 本堂 武夫
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