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| Titel |
An improved semi-empirical model for the densification of Antarctic firn |
| VerfasserIn |
S. R. M. Ligtenberg, M. M. Helsen, M. R. Broeke |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 5, no. 4 ; Nr. 5, no. 4 (2011-10-12), S.809-819 |
| Datensatznummer |
250002743
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| Publikation (Nr.) |
 copernicus.org/tc-5-809-2011.pdf |
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| Zusammenfassung |
| A firn densification model is presented that simulates steady-state Antarctic
firn density profiles, as well as the temporal evolution of firn density and
surface height. The model uses an improved firn densification expression that
is tuned to fit depth-density observations. Liquid water processes (meltwater
percolation, retention and refreezing) are also included. Two applications are
presented. First, the steady-state model version is used to simulate the strong
spatial variability in firn layer thickness across the Antarctic ice sheet. Second,
the time-dependent model is run for 3 Antarctic locations with different climate
conditions. Surface height changes are caused by a combination of accumulation,
melting and firn densification processes. On all 3 locations, an upward trend
of the surface during autumn, winter and spring is present, while during
summer there is a more rapid lowering of the surface. Accumulation and (if
present) melt introduce large inter-annual variability in surface height trends,
possibly hiding ice dynamical thickening and thinning. |
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