 |
| Titel |
A balanced water layer concept for subglacial hydrology in large-scale ice sheet models |
| VerfasserIn |
S. Goeller, M. Thoma, K. Grosfeld, Heinrich Miller  |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1994-0416
|
| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 7, no. 4 ; Nr. 7, no. 4 (2013-07-13), S.1095-1106 |
| Datensatznummer |
250017988
|
| Publikation (Nr.) |
 copernicus.org/tc-7-1095-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| There is currently no doubt about the existence of a widespread hydrological
network under the Antarctic Ice Sheet, which lubricates the ice base and thus
leads to increased ice velocities. Consequently, ice models should
incorporate basal hydrology to obtain meaningful results for future ice
dynamics and their contribution to global sea level rise. Here, we introduce
the balanced water layer concept, covering two prominent subglacial
hydrological features for ice sheet modeling on a continental scale: the
evolution of subglacial lakes and balance water fluxes. We couple it to the
thermomechanical ice-flow model RIMBAY and apply it to a synthetic
model domain. In our experiments we demonstrate the dynamic generation of
subglacial lakes and their impact on the velocity field of the overlaying ice
sheet, resulting in a negative ice mass balance. Furthermore, we introduce an
elementary parametrization of the water flux–basal sliding coupling and
reveal the predominance of the ice loss through the resulting ice streams
against the stabilizing influence of less hydrologically active areas. We
point out that established balance flux schemes quantify these effects only
partially as their ability to store subglacial water is lacking. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|