An improved semi-empirical model for the densification of Antarctic firn
Ligtenberg, S.R.M.; Heilsen, M.M.; van de Broeke, M.R.. 2011 An improved semi-empirical model for the densification of Antarctic firn. The Cryosphere, 5 (4). 809-819. 10.5194/tc-5-809-2011Before downloading, please read NORA policies.
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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.
|Item Type:||Publication - Article|
|Digital Object Identifier (DOI):||10.5194/tc-5-809-2011|
|Programmes:||BAS Programmes > EU:Ice2Sea|
|Additional Information. Not used in RCUK Gateway to Research.:||Ice2Sea. Open access article made available under a CC-BY Creative Commons Attribution license.|
|Date made live:||20 Mar 2012 12:33|
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