Title Formation of air clathrate hydrates in polar ice sheets; heterogeneous nucleation induced by micro-inclusions
Author Ohno, H.; Lipenkov, V.Y.; Hondoh, T.
Author Affil Ohno, H., Hokkaido University, Institute of Low Temperature Science, Sapporo, Japan. Other: Arctic and Antarctic Research Institute, Russian Federation
Source Journal of Glaciology, 56(199), p.917- 921, . Publisher: International Glaciological Society, Cambridge, United Kingdom. ISSN: 0022-1430
Publication Date 2010
Notes In English. 29 refs. Ant. Acc. No: 91606. GeoRef Acc. No: 310363
Index Terms clathrates; hydrates; ice; ice nuclei; ice physics; Antarctica--Antarctic ice sheet; Antarctica--Dome Fuji Station; air; Antarctic ice sheet; Antarctica; Dome Fuji; Dome Fuji Station; ice cores; Queen Maud Land
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.
URL http://hdl.handle.net/10.3189/002214310794457317
Publication Type journal article
Record ID 65007208