 |
| Titel |
Relating inverse-derived basal sliding coefficients beneath ice sheets to basal water supply and other large-scale variables |
| VerfasserIn |
David Pollard, Robert DeConto |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250077546
|
|
|
|
|
|
| Zusammenfassung |
| Variations in basal conditions that determine basal sliding are important
boundary conditions for large-scale ice-sheet models, but remain largely
uncertain below modern ice sheets. Previous modeling studies have used
relatively sophisticated inverse control methods to deduce patterns of
basal stress or roughness, fitting to observed velocities. Here a much
simpler method is used, running the model forward in time and periodically
increasing or decreasing the basal sliding coefficient locally depending
on whether the model ice elevation is higher or lower than observed.
In contrast to our earlier application, the method is applied to
Antarctica without any constraints of basal temperature or water
availability. Then the deduced pattern of sliding coefficients is related
to distributions of basal temperature, water supply, sub-grid-scale
topography and other variables, with the goal of deriving an empirical
parameterization of sliding coefficients for continental-scale models.
~ |
|
|
|
|
|
|