δD – δ18O Relationships in Ice Formed by Subglacial Freezing: Paleoclimatic Implications
- 1 January 1985
- journal article
- research article
- Published by Cambridge University Press (CUP) in Journal of Glaciology
- Vol. 31 (109) , 229-232
- https://doi.org/10.1017/s0022143000006547
Abstract
A freezing slope, distinct from that of precipitation, is displayed on a δD–δ18O 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.Keywords
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