The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica
Recent advances in the measurement of bedforms beneath active ice streams have been made using ground-based grid profiling using impulse radar systems operating with centre frequencies in the 3–5 MHz range. Surveys of Rutford Ice Stream and Pine Island Glacier have shown that features such as mega-s...
Published in: | Annals of Glaciology |
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Language: | English |
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Cambridge University Press
2020
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Online Access: | http://nora.nerc.ac.uk/id/eprint/526078/ https://nora.nerc.ac.uk/id/eprint/526078/1/precision_of_radarderived_subglacial_bed_topography_a_case_study_from_pine_island_glacier_antarctica.pdf https://www.cambridge.org/core/journals/annals-of-glaciology/article/precision-of-radarderived-subglacial-bed-topography-a-case-study-from-pine-island-glacier-antarctica/577C420F989336148355B9AA282FEA41 |
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ftnerc:oai:nora.nerc.ac.uk:526078 2023-05-15T13:29:42+02:00 The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica King, Edward C. 2020-04-01 text http://nora.nerc.ac.uk/id/eprint/526078/ https://nora.nerc.ac.uk/id/eprint/526078/1/precision_of_radarderived_subglacial_bed_topography_a_case_study_from_pine_island_glacier_antarctica.pdf https://www.cambridge.org/core/journals/annals-of-glaciology/article/precision-of-radarderived-subglacial-bed-topography-a-case-study-from-pine-island-glacier-antarctica/577C420F989336148355B9AA282FEA41 en eng Cambridge University Press https://nora.nerc.ac.uk/id/eprint/526078/1/precision_of_radarderived_subglacial_bed_topography_a_case_study_from_pine_island_glacier_antarctica.pdf King, Edward C. orcid:0000-0003-3793-3915 . 2020 The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica. Annals of Glaciology, 61 (81). 154-161. https://doi.org/10.1017/aog.2020.33 <https://doi.org/10.1017/aog.2020.33> cc_by_4 CC-BY Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.1017/aog.2020.33 2023-02-04T19:49:47Z Recent advances in the measurement of bedforms beneath active ice streams have been made using ground-based grid profiling using impulse radar systems operating with centre frequencies in the 3–5 MHz range. Surveys of Rutford Ice Stream and Pine Island Glacier have shown that features such as mega-scale glacial lineations with topographic relief of as little as 3 m can be traced for many kilometres downstream under more than 2 km of fast-moving ice. In the discussion of these data, it is often asked ‘How is it possible to map such fine-scale topography with such a low-frequency radar’. In answering that question, the key point is the distinction between the precision of a radar range measurement to a single, isolated reflective interface and the ability to resolve the presence of two closely-spaced interfaces of similar reflectivity (commonly referred to as the vertical resolution). This paper will discuss and illustrate this distinction and use the case study of data acquired over Pine Island Glacier to examine the limits of precision of the radar range measurement. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica Pine Island Pine Island Glacier Rutford Ice Stream Natural Environment Research Council: NERC Open Research Archive Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) Annals of Glaciology 61 81 154 161 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Recent advances in the measurement of bedforms beneath active ice streams have been made using ground-based grid profiling using impulse radar systems operating with centre frequencies in the 3–5 MHz range. Surveys of Rutford Ice Stream and Pine Island Glacier have shown that features such as mega-scale glacial lineations with topographic relief of as little as 3 m can be traced for many kilometres downstream under more than 2 km of fast-moving ice. In the discussion of these data, it is often asked ‘How is it possible to map such fine-scale topography with such a low-frequency radar’. In answering that question, the key point is the distinction between the precision of a radar range measurement to a single, isolated reflective interface and the ability to resolve the presence of two closely-spaced interfaces of similar reflectivity (commonly referred to as the vertical resolution). This paper will discuss and illustrate this distinction and use the case study of data acquired over Pine Island Glacier to examine the limits of precision of the radar range measurement. |
format |
Article in Journal/Newspaper |
author |
King, Edward C. |
spellingShingle |
King, Edward C. The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica |
author_facet |
King, Edward C. |
author_sort |
King, Edward C. |
title |
The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica |
title_short |
The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica |
title_full |
The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica |
title_fullStr |
The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica |
title_full_unstemmed |
The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica |
title_sort |
precision of radar-derived subglacial bed topography: a case study from pine island glacier, antarctica |
publisher |
Cambridge University Press |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/526078/ https://nora.nerc.ac.uk/id/eprint/526078/1/precision_of_radarderived_subglacial_bed_topography_a_case_study_from_pine_island_glacier_antarctica.pdf https://www.cambridge.org/core/journals/annals-of-glaciology/article/precision-of-radarderived-subglacial-bed-topography-a-case-study-from-pine-island-glacier-antarctica/577C420F989336148355B9AA282FEA41 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) |
geographic |
Pine Island Glacier Rutford Rutford Ice Stream |
geographic_facet |
Pine Island Glacier Rutford Rutford Ice Stream |
genre |
Annals of Glaciology Antarc* Antarctica Pine Island Pine Island Glacier Rutford Ice Stream |
genre_facet |
Annals of Glaciology Antarc* Antarctica Pine Island Pine Island Glacier Rutford Ice Stream |
op_relation |
https://nora.nerc.ac.uk/id/eprint/526078/1/precision_of_radarderived_subglacial_bed_topography_a_case_study_from_pine_island_glacier_antarctica.pdf King, Edward C. orcid:0000-0003-3793-3915 . 2020 The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica. Annals of Glaciology, 61 (81). 154-161. https://doi.org/10.1017/aog.2020.33 <https://doi.org/10.1017/aog.2020.33> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/aog.2020.33 |
container_title |
Annals of Glaciology |
container_volume |
61 |
container_issue |
81 |
container_start_page |
154 |
op_container_end_page |
161 |
_version_ |
1766002078601183232 |