1993
DOI: 10.1017/s0260305500012830
|View full text |Cite
|
Sign up to set email alerts
|

Precise altimetric topography in ice-sheet flow studies

Abstract: ABSTRACT. The precision of radar altimetry above an ice sheet can improve glaciological studies such as mass balance surveys or ice-sheet flow models, the first by comparing altimetric data at different times (see this issue), the second by testing or constraining models with data. This paper is a first step towards the latter. From a precise topography deduced by inversion of altimetric data (Remy and others, 1989), we calculate ice-flow direction, balance velocity and basal shear stress. The rheological para… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
2
1

Citation Types

0
5
0

Year Published

1996
1996
2008
2008

Publication Types

Select...
8

Relationship

0
8

Authors

Journals

citations
Cited by 10 publications
(5 citation statements)
references
References 11 publications
0
5
0
Order By: Relevance
“…The flowline scheme (now called FL) is based on the upstream calculation of the surface between two distinct flowlines, originally lying on a contour on both sides of a point (Remy and Minster, 1993). The upstream paths of the two flowlines are then computed at 5 km intervals along the flowlines, with a local slope calculated over a 10 km length scale.…”
Section: Computing Schemesmentioning
confidence: 99%
See 2 more Smart Citations
“…The flowline scheme (now called FL) is based on the upstream calculation of the surface between two distinct flowlines, originally lying on a contour on both sides of a point (Remy and Minster, 1993). The upstream paths of the two flowlines are then computed at 5 km intervals along the flowlines, with a local slope calculated over a 10 km length scale.…”
Section: Computing Schemesmentioning
confidence: 99%
“…Computation of the balance velocities was performed in the Lambert Glacier basin (LGB) region, using the two methodologies discussed above. Two different 5 km digital elevation models (DEMs) of the Antarctic ice sheet, derived from the altimetric data of the European Remote-sensing Satellite (ERS-1) (Liu and others, 1999; Remy and others, 1999), were chosen to assess the variability due to topography. The BEDMAP thickness compilation (Lythe and others, 2001) and a recent compilation of accumulation rates (Vaughan and others, 1999) were used as the other data-input sources.…”
Section: Computing Schemesmentioning
confidence: 99%
See 1 more Smart Citation
“…3a) is estimated from the thermodynamic equation under a steady-state assumption and considering dissipation, vertical diffusion, vertical and horizontal advection. More details can be found in Ritz (1987), Remy and others (1996) or Remy and Minster (1993). The quantity U/ H derived from balance velocities and the thickness is supposed to be proportional to the mean shear strain rate ε through the ice thickness (Fig.…”
Section: Theoretical Basismentioning
confidence: 99%
“…The main interest of satellite altimetry data over ice sheets is the construction of a very precise topography that allows us either to constrain ice-sheet flow models (Rémy and Minster, 1993; Rémy and others, 1996) or to estimate the ice-cap mass balance (Zwally, 1989; Wingham, 1995a). However, altimetric observations should also provide information about the surface and/or subsurface snow properties (Ridley and Partington, 1988; Rémy and others, 1990,1995).…”
Section: Introductionmentioning
confidence: 99%