A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements
The three-dimensional modelling program MARCO_AIR has been used to calculate the response of idealized sea-ice pressure ridge models to practical airborne and shipborne electromagnetic systems. The model results clearly show the superior lateral resolution of the horizontal coplanar shipborne system...
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Australian Society of Exploration Geophysicists
2003
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Online Access: | https://doi.org/10.1071/EG03046 http://ecite.utas.edu.au/28039 |
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ftunivtasecite:oai:ecite.utas.edu.au:28039 2023-05-15T14:03:54+02:00 A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements Reid, JE Vrbancich, J Worby, AP 2003 https://doi.org/10.1071/EG03046 http://ecite.utas.edu.au/28039 en eng Australian Society of Exploration Geophysicists http://dx.doi.org/10.1071/EG03046 Reid, JE and Vrbancich, J and Worby, AP, A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements, Exploration Geophysics, 34, (1) pp. 46-50. ISSN 0812-3985 (2003) [Refereed Article] http://ecite.utas.edu.au/28039 Earth Sciences Geophysics Electrical and Electromagnetic Methods in Geophysics Refereed Article PeerReviewed 2003 ftunivtasecite https://doi.org/10.1071/EG03046 2019-12-13T21:08:35Z The three-dimensional modelling program MARCO_AIR has been used to calculate the response of idealized sea-ice pressure ridge models to practical airborne and shipborne electromagnetic systems. The model results clearly show the superior lateral resolution of the horizontal coplanar shipborne system compared to higher-altitude airborne measurements. However, sea-ice keel thicknesses estimated via one-dimensional inversion of shipborne single-frequency electromagnetic data are strongly dependent on relatively small variations in survey altitude. One-dimensional inversion of synthetic helicopter electromagnetic data over three-dimensional pressure ridge models shows that the maximum ice keel thickness is consistently underestimated, although airborne EM methods yield reliable thickness estimates over level ice. The vertical-coaxial coil survey geometry offers excellent lateral resolution of multiple targets, but the anomalies of typical Antarctic sea-ice pressure ridges would be too small to be reliably detected in practical surveys using an HEM system with a transmitter-receiver separation of 2?3 m. For an HEM system with a coil separation of 8 m, the vertical coaxial responses are larger, and lateral resolution of the vertical coaxial measurements at a flight height of 20 m is superior to a close-coupled horizontal coplanar system flown at an altitude of 10 m. 2003, CSIRO. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Sea ice eCite UTAS (University of Tasmania) Antarctic Exploration Geophysics 34 1-2 46 50 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geophysics Electrical and Electromagnetic Methods in Geophysics |
spellingShingle |
Earth Sciences Geophysics Electrical and Electromagnetic Methods in Geophysics Reid, JE Vrbancich, J Worby, AP A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements |
topic_facet |
Earth Sciences Geophysics Electrical and Electromagnetic Methods in Geophysics |
description |
The three-dimensional modelling program MARCO_AIR has been used to calculate the response of idealized sea-ice pressure ridge models to practical airborne and shipborne electromagnetic systems. The model results clearly show the superior lateral resolution of the horizontal coplanar shipborne system compared to higher-altitude airborne measurements. However, sea-ice keel thicknesses estimated via one-dimensional inversion of shipborne single-frequency electromagnetic data are strongly dependent on relatively small variations in survey altitude. One-dimensional inversion of synthetic helicopter electromagnetic data over three-dimensional pressure ridge models shows that the maximum ice keel thickness is consistently underestimated, although airborne EM methods yield reliable thickness estimates over level ice. The vertical-coaxial coil survey geometry offers excellent lateral resolution of multiple targets, but the anomalies of typical Antarctic sea-ice pressure ridges would be too small to be reliably detected in practical surveys using an HEM system with a transmitter-receiver separation of 2?3 m. For an HEM system with a coil separation of 8 m, the vertical coaxial responses are larger, and lateral resolution of the vertical coaxial measurements at a flight height of 20 m is superior to a close-coupled horizontal coplanar system flown at an altitude of 10 m. 2003, CSIRO. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Reid, JE Vrbancich, J Worby, AP |
author_facet |
Reid, JE Vrbancich, J Worby, AP |
author_sort |
Reid, JE |
title |
A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements |
title_short |
A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements |
title_full |
A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements |
title_fullStr |
A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements |
title_full_unstemmed |
A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements |
title_sort |
comparison of shipborne and airborne electromagnetic methods for antarctic sea ice thickness measurements |
publisher |
Australian Society of Exploration Geophysicists |
publishDate |
2003 |
url |
https://doi.org/10.1071/EG03046 http://ecite.utas.edu.au/28039 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
http://dx.doi.org/10.1071/EG03046 Reid, JE and Vrbancich, J and Worby, AP, A comparison of shipborne and airborne electromagnetic methods for Antarctic sea ice thickness measurements, Exploration Geophysics, 34, (1) pp. 46-50. ISSN 0812-3985 (2003) [Refereed Article] http://ecite.utas.edu.au/28039 |
op_doi |
https://doi.org/10.1071/EG03046 |
container_title |
Exploration Geophysics |
container_volume |
34 |
container_issue |
1-2 |
container_start_page |
46 |
op_container_end_page |
50 |
_version_ |
1766274766865432576 |