A Glacier Bed DEM for Jakobshavns Trough as Input for Dynamic Ice Sheet Models
Abstract
The objective of the paper is to present thoughts on connecting geophysical observations and dynamic ice sheet models. Specifically, surface elevation, bed topography and surface roughness are considered, using observations at several scales. The talk builds on ideas, concepts and results from IceBridge, ICESat, CReSIS, SeaRISE and MICROTOP projects. A specific problem in connecting data and models is that of integrating high-resolution remote-sensing observations into models which are typically run at 5 or 10 kilometer grid spacing. We derive an algorithm for preserving important sub-scale morphologic characteristics at grids of lower resolution, in particular for linear features such as canyons and ridge lines. This algorithm solves the problem of creating a Greenland bed topography DEM that includes the trough of Jakobshavns Isbrae, Greenland, at the resolution used for input in dynamic ice sheet models. Data from recent airborne radar measurements of the elevation of the subgacial bed as part of the CReSIS project are utilized. The new bed is available on the SeaRISE website and wiki (as bed data set Greenland_5km_dev1.2.nc) and used by modeling groups.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2010
- Bibcode:
- 2010AGUFM.C31B..03W
- Keywords:
-
- 0700 CRYOSPHERE