Ice stream basal conditions from block-wise surface data inversion and simple regression models of ice stream flow: Application to Bindschadler Ice Stream
Article first published online: 4 DEC 2008
Copyright 2008 by the American Geophysical Union.
Journal of Geophysical Research: Earth Surface (2003–2012)
Volume 113, Issue F4, December 2008
How to Cite
2008), Ice stream basal conditions from block-wise surface data inversion and simple regression models of ice stream flow: Application to Bindschadler Ice Stream, J. Geophys. Res., 113, F04010, doi:10.1029/2008JF001004., , , and (
- Issue published online: 4 DEC 2008
- Article first published online: 4 DEC 2008
- Manuscript Accepted: 3 SEP 2008
- Manuscript Revised: 20 JUN 2008
- Manuscript Received: 20 FEB 2008
- ice streams;
- inverse methods;
- regression model
 Widespread basal conditions controlling ice stream flows are still beyond the scope of direct observation, thus knowledge of their magnitudes and variabilities comes from inversion of surface measurements: ice velocities, surface elevations, and thicknesses. We present a new approach to implement a widely accepted inverse method on regular (10 × 10 km) blocks, smaller than the whole domain, to enhance the spatial resolution of calculated basal conditions. Inverted basal friction coefficients and calculated shear stress have sharp transitions and large variations in small areas. Overall, the obtained basal shear stress is very small in regions of fast flowing ice. The results of the inversion, along with the surface variables, are used to construct two simple regression models of Bindschadler Ice Stream (former Ice Stream D) that reproduce 96% of observed velocity variations. While highly idealized, these regression models are sufficiently informative to be considered as parameterizations for ice stream flow in large-scale ice sheet models which lack the spatial and temporal resolution necessary to simulate ice stream dynamics in detail.