Investigating processes of marine ice formation in a floating ice tongue by a high-resolution isotopic study
International audience A better knowledge of boundary conditions near a grounding line is critical for understanding the behavior of ice shelves and floating glaciers. We show here that significant information can be gained from a high-resolution isotopic and textural study of marine ice accreted at...
| Published in: | Journal of Geophysical Research |
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| Main Authors: | , , , , , , |
| Other Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
HAL CCSD
1995
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| Subjects: | |
| Online Access: | https://hal.archives-ouvertes.fr/hal-03334866 https://hal.archives-ouvertes.fr/hal-03334866/document https://hal.archives-ouvertes.fr/hal-03334866/file/jgr1995Souchez7019.pdf https://doi.org/10.1029/95JC00142 |
| Summary: | International audience A better knowledge of boundary conditions near a grounding line is critical for understanding the behavior of ice shelves and floating glaciers. We show here that significant information can be gained from a high-resolution isotopic and textural study of marine ice accreted at the bottom of a floating glacier near its grounding line. Two different types of marine ice have been found. Type 1 is bubble-and debris-free ice with properties which, we believe, can be explained by intrusion of brackish water in open basal fissures. Closing of the fissures by progression of a freezing front from the sides is precluded, and filling by frazil ice is favored. Type 2 is made of thin, clear ice and debris layers which are thought to have formed when a subglacial water-filled sediment enters into contact with seawater and is subjected to freezing under a doublediffusion process. The paper also stresses that in a •iD-•i•80 diagram the alignment of marine ice samples on a mixing line does not necessarily imply a mixture of continental water and seawater in varying proportions. |
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