 |
| Titel |
Using characteristics of the Antarctic surface elevation to infer information on ice flow dynamics. |
| VerfasserIn |
G. Navas, C. Ritz, F. Remy |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250021041
|
|
|
|
|
|
| Zusammenfassung |
| Using characteristics of the Antarctic surface elevation to infer information on ice flow dynamics.
G. Navas, C. Ritz, F. Rémy
Sea level rise is one of the expected impacts of global warming. Among
the processes responsible of this sea level rise, ice sheet dynamics
is not only an important one, it is also a domain where our ability to
perform realistic simulations is still poor and bad surprises cannot
be excluded. Two main branches of ice sheet modelling are concerned:
Surface mass balance will hopefully be dealt with by coupling with
GCMs. Ice flow is another aspect that we need to improve by
identifying mechanisms, developing suitable models and methods to test them.
Ice sheet elevation is a free surface reflecting both internal
processes and surface mass balance. It is both a characteristic
observed by satellite alitmetry with a good spatial coverage and a
prognostic variable of ice sheets models. We present here a variety of
indicators to characterize the Antarctic ice sheet surface. Our
indicators are mainly based on first and second derivatives of the ice
sheet surface (respectively slope and curvature) and we investigate
the impact of spatial scale on which they are computed. To link them
with ice drainage we first compare the surface patterns with observed
velocities or balance velocities. Secondly, we apply this method to
the surface elevation modelled by the ice sheet model GRISLI to assess
how, where and why this model is able to reproduce observed features
(or not). |
|
|
|
|
|
|