δD – δ18O Relationships in Ice Formed by Subglacial Freezing: Paleoclimatic Implications
Abstract A freezing slope, distinct from that of precipitation, is displayed on a δD–δ 18 O diagram by basal ice in different circumstances. However, if the subglacial reservoir allowed to freeze is mixed in the course of time with an input having a lighter isotopic composition, basal ice cannot be...
| Published in: | Journal of Glaciology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Cambridge University Press (CUP)
1985
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1017/s0022143000006547 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000006547 |
| Summary: | Abstract A freezing slope, distinct from that of precipitation, is displayed on a δD–δ 18 O diagram by basal ice in different circumstances. However, if the subglacial reservoir allowed to freeze is mixed in the course of time with an input having a lighter isotopic composition, basal ice cannot be distinguished from glacier ice in terms of slope. Such a situation is encountered at the base of Grubengletscher and is indicated by a computer simulation using the open-system model of Souchez and Jouzel (1984). Suggested implications for the paleoclimatic interpretation of deep ice cores recovered from the bottom part of polar ice sheets are given. |
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