Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica
Abstract In order to determine accurate velocities of the ice sheet in the interior of Antarctica, approximately along a flow line, a detailed trilateration net was established in 1973 from the summit of Law Dome (100 km inland) to about 250 km south near the 2000 m contour. The net consisted of a d...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1979
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0022143000014672 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000014672 |
id |
crcambridgeupr:10.1017/s0022143000014672 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0022143000014672 2024-03-03T08:38:37+00:00 Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica Budd, W. F. Young, N. W. 1979 http://dx.doi.org/10.1017/s0022143000014672 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000014672 en eng Cambridge University Press (CUP) Journal of Glaciology volume 24, issue 90, page 89-101 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1979 crcambridgeupr https://doi.org/10.1017/s0022143000014672 2024-02-08T08:34:04Z Abstract In order to determine accurate velocities of the ice sheet in the interior of Antarctica, approximately along a flow line, a detailed trilateration net was established in 1973 from the summit of Law Dome (100 km inland) to about 250 km south near the 2000 m contour. The net consisted of a double line of markers approximately 10 km apart with all sides and diagonals of the quadrilaterals measured with telluro-meters. In addition, satellite doppler survey positions and astronomical azimuths were determined at about 50 km intervals to control the net on the large scale. Other measurements carried out en route included: continuous barometric levelling, radio echo-sounding, gravimetry, accumulation, and surface sampling. The route was close to an earlier traverse route which reached Vostok in 1962 and along which other data, including snow-surface temperatures and temperature–depth gradients, were determined. The trilateration net was re-surveyed in 1975 allowing velocities and strain-rates to be determined. The results indicate that the ice sheet is close to balance in this region. Therefore, the measured velocities were used together with “balance velocities”, further inland, to carry out a modelling study of a flow line, to derive particle trajectories, ages, temperature profiles, and “dynamics velocities”, from a flow law. The results provide further insight into the dynamics and flow properties of the ice sheet. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Journal of Glaciology Wilkes Land Cambridge University Press Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Law Dome ENVELOPE(112.833,112.833,-66.733,-66.733) Journal of Glaciology 24 90 89 101 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Budd, W. F. Young, N. W. Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica |
topic_facet |
Earth-Surface Processes |
description |
Abstract In order to determine accurate velocities of the ice sheet in the interior of Antarctica, approximately along a flow line, a detailed trilateration net was established in 1973 from the summit of Law Dome (100 km inland) to about 250 km south near the 2000 m contour. The net consisted of a double line of markers approximately 10 km apart with all sides and diagonals of the quadrilaterals measured with telluro-meters. In addition, satellite doppler survey positions and astronomical azimuths were determined at about 50 km intervals to control the net on the large scale. Other measurements carried out en route included: continuous barometric levelling, radio echo-sounding, gravimetry, accumulation, and surface sampling. The route was close to an earlier traverse route which reached Vostok in 1962 and along which other data, including snow-surface temperatures and temperature–depth gradients, were determined. The trilateration net was re-surveyed in 1975 allowing velocities and strain-rates to be determined. The results indicate that the ice sheet is close to balance in this region. Therefore, the measured velocities were used together with “balance velocities”, further inland, to carry out a modelling study of a flow line, to derive particle trajectories, ages, temperature profiles, and “dynamics velocities”, from a flow law. The results provide further insight into the dynamics and flow properties of the ice sheet. |
format |
Article in Journal/Newspaper |
author |
Budd, W. F. Young, N. W. |
author_facet |
Budd, W. F. Young, N. W. |
author_sort |
Budd, W. F. |
title |
Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica |
title_short |
Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica |
title_full |
Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica |
title_fullStr |
Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica |
title_full_unstemmed |
Results from the I.A.G.P. Flow-Line Study Inland of Casey, Wilkes Land, Antarctica |
title_sort |
results from the i.a.g.p. flow-line study inland of casey, wilkes land, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1979 |
url |
http://dx.doi.org/10.1017/s0022143000014672 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000014672 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) ENVELOPE(112.833,112.833,-66.733,-66.733) |
geographic |
Wilkes Land Law Dome |
geographic_facet |
Wilkes Land Law Dome |
genre |
Antarc* Antarctica Ice Sheet Journal of Glaciology Wilkes Land |
genre_facet |
Antarc* Antarctica Ice Sheet Journal of Glaciology Wilkes Land |
op_source |
Journal of Glaciology volume 24, issue 90, page 89-101 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000014672 |
container_title |
Journal of Glaciology |
container_volume |
24 |
container_issue |
90 |
container_start_page |
89 |
op_container_end_page |
101 |
_version_ |
1792507039390367744 |