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| Titel |
1-D-ice flow modelling at EPICA Dome C and Dome Fuji, East Antarctica |
| VerfasserIn |
F. Parrenin, G. Dreyfus, G. Durand, S. Fujita, O. Gagliardini, F. Gillet, J. Jouzel, K. Kawamura, N. Lhomme, V. Masson-Delmotte, C. Ritz, J. Schwander, H. Shoji, R. Uemura, O. Watanabe, N. Yoshida |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 3, no. 2 ; Nr. 3, no. 2 (2007-06-01), S.243-259 |
| Datensatznummer |
250000896
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| Publikation (Nr.) |
 copernicus.org/cp-3-243-2007.pdf |
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| Zusammenfassung |
| One-dimensional (1-D) ice flow models are used to construct the age scales at
the Dome C and Dome Fuji drilling sites (East Antarctica). The poorly
constrained glaciological parameters at each site are recovered by fitting
independent age markers identified within each core. We reconstruct past
accumulation rates, that are larger than those modelled using the classical
vapour saturation pressure relationship during glacial periods by up to a
factor 1.5. During the Early Holocene, changes in reconstructed accumulation
are not linearly related to changes in ice
isotopic composition. A simple model of past elevation changes is developed
and shows an
amplitude variation of 110–120 m at both sites. We suggest that there is
basal melting at Dome C (0.56±0.19 mm/yr). The reconstructed velocity
profile is highly non-linear at both sites, which suggests complex ice flow
effects. This induces a non-linear thinning function in both drilling sites,
which is also characterized by bumps corresponding to variations in ice
thickness with time. |
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