Options
Lakes and subglacial hydrological networks around Dome C, East Antarctica
Author(s)
Language
English
Obiettivo Specifico
3.8. Geofisica per l'ambiente
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/ 37 (2003)
Publisher
International Glaciological Society
Pages (printed)
252-256
Issued date
2003
Keywords
Abstract
Precise topography from European Remote-sensing Satellite radar altimetry
and high density of airborne radio-echo sounding in the area surrounding Dome C,
Antarctica, show a link between surface features and subglacial lakes. In this paper, we extend the study to fine structures by computing a curvature-based coefficient (cy) related to surface undulations. These coefficient variations reveal many surface undulations, and some elongated features of this parameter seem to link known subglacial lakes. A population of high values of this coefficient, assumed to correspond to transitions between sliding and non-sliding flow regime, strengthen the appearance of a network which would link most of the lakes in the area. The existence of such a network impacts on ice-flow dynamics and on
subglacial-lake studies.
and high density of airborne radio-echo sounding in the area surrounding Dome C,
Antarctica, show a link between surface features and subglacial lakes. In this paper, we extend the study to fine structures by computing a curvature-based coefficient (cy) related to surface undulations. These coefficient variations reveal many surface undulations, and some elongated features of this parameter seem to link known subglacial lakes. A population of high values of this coefficient, assumed to correspond to transitions between sliding and non-sliding flow regime, strengthen the appearance of a network which would link most of the lakes in the area. The existence of such a network impacts on ice-flow dynamics and on
subglacial-lake studies.
References
Budd, W. F. and D. B. Carter. 1971. An analysis of the relation between the
surface and bedrock profiles of ice caps. J. Glaciol., 10(59), 197-209.
Legrésy, B., E. Rignot and I. E. Tabacco. 2000. Constraining ice dynamics
at Dome C, Antarctica, using remotely sensed measurements. Geophys.
Res. Lett., 27(21), 3493-3496.
Lythe, M. B., D.G. Vaughan and BEDMAP Consortium. 2001. BEDMAP: a
new ice thickness and subglacial topographic model of Antarctica. J.
Geophys. Res., 106(B6), 11,335-11,351.
Rémy, F. and I. E. Tabacco. 2000. Bedrock features and ice flow near the
EPICA ice core site (Dome C, Antarctica). Geophys. Res. Lett., 27(3),
405-409.
Rémy, F., P. Shaeffer and B. Legrésy. 1999. Ice flow physical processes derived
from ERS-1 high-resolution map of Antarctica and Greenland ice sheet.
Geophys. J. Int., 139(3), 645-656.
Rémy, F., B. Legrésy and L. Testut. 2001. Ice sheet and radar altimetry. Surveys
in Geophysics, 22, 1-29.
Ritz, C. 1989. Interpretation of the temperature profile measured at Vostok,
East Antarctica. Ann. Glaciol., 12, 138-144.
Siegert, M. J. and J.K. Ridley. 1998a. An analysis of the ice-sheet surface
and subsurface topography above the Vostok Station subglacial lake, central East Antarctica. J. Geophys. Res., 103(B5), 10,195-10,207.
Siegert,M. J. and J.K. Ridley. 1998b. Determining basal ice-sheet conditions
in the Dome C region of East Antarctica using satellite radar altimetry
and airborne radio-echo sounding. J. Glaciol., 44(146), 1-8.
Tabacco, I.E., A. Passerini, F. Corbelli and M. Gorman. 1998. Correspondence.
Determination of the surface and bed topography at DomeC, East
Antarctica. J. Glaciol., 44(146), 185-191.
Testut, L., I.E. Tabacco, C. Bianchi and F. Rémy. 2000. Influence of geometrical
boundary conditions on the estimation of rheological parameters. Ann.
Glaciol., 30, 102-106.
surface and bedrock profiles of ice caps. J. Glaciol., 10(59), 197-209.
Legrésy, B., E. Rignot and I. E. Tabacco. 2000. Constraining ice dynamics
at Dome C, Antarctica, using remotely sensed measurements. Geophys.
Res. Lett., 27(21), 3493-3496.
Lythe, M. B., D.G. Vaughan and BEDMAP Consortium. 2001. BEDMAP: a
new ice thickness and subglacial topographic model of Antarctica. J.
Geophys. Res., 106(B6), 11,335-11,351.
Rémy, F. and I. E. Tabacco. 2000. Bedrock features and ice flow near the
EPICA ice core site (Dome C, Antarctica). Geophys. Res. Lett., 27(3),
405-409.
Rémy, F., P. Shaeffer and B. Legrésy. 1999. Ice flow physical processes derived
from ERS-1 high-resolution map of Antarctica and Greenland ice sheet.
Geophys. J. Int., 139(3), 645-656.
Rémy, F., B. Legrésy and L. Testut. 2001. Ice sheet and radar altimetry. Surveys
in Geophysics, 22, 1-29.
Ritz, C. 1989. Interpretation of the temperature profile measured at Vostok,
East Antarctica. Ann. Glaciol., 12, 138-144.
Siegert, M. J. and J.K. Ridley. 1998a. An analysis of the ice-sheet surface
and subsurface topography above the Vostok Station subglacial lake, central East Antarctica. J. Geophys. Res., 103(B5), 10,195-10,207.
Siegert,M. J. and J.K. Ridley. 1998b. Determining basal ice-sheet conditions
in the Dome C region of East Antarctica using satellite radar altimetry
and airborne radio-echo sounding. J. Glaciol., 44(146), 1-8.
Tabacco, I.E., A. Passerini, F. Corbelli and M. Gorman. 1998. Correspondence.
Determination of the surface and bed topography at DomeC, East
Antarctica. J. Glaciol., 44(146), 185-191.
Testut, L., I.E. Tabacco, C. Bianchi and F. Rémy. 2000. Influence of geometrical
boundary conditions on the estimation of rheological parameters. Ann.
Glaciol., 30, 102-106.
Type
article
File(s)
No Thumbnail Available
Name
REMY-2003-Vol37.pdf
Description
main article
Size
1.11 MB
Format
Adobe PDF
Checksum (MD5)
7d4b78c80adab94e9a08946c408410a0