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 |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press
2020
|
Subjects: | |
Online Access: | https://doi.org/10.1017/aog.2020.33 https://doaj.org/article/19138144c4314f5682a415440ec009e3 |
id |
ftdoajarticles:oai:doaj.org/article:19138144c4314f5682a415440ec009e3 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:19138144c4314f5682a415440ec009e3 2023-05-15T13:29:36+02:00 The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica Edward C. King 2020-04-01T00:00:00Z https://doi.org/10.1017/aog.2020.33 https://doaj.org/article/19138144c4314f5682a415440ec009e3 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305520000336/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.33 0260-3055 1727-5644 https://doaj.org/article/19138144c4314f5682a415440ec009e3 Annals of Glaciology, Vol 61, Pp 154-161 (2020) Glacier geophysics glaciological instruments and methods radio-echo sounding subglacial exploration geophysics Meteorology. Climatology QC851-999 article 2020 ftdoajarticles https://doi.org/10.1017/aog.2020.33 2023-03-12T01:31:55Z 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 Directory of Open Access Journals: DOAJ Articles 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 |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Glacier geophysics glaciological instruments and methods radio-echo sounding subglacial exploration geophysics Meteorology. Climatology QC851-999 |
spellingShingle |
Glacier geophysics glaciological instruments and methods radio-echo sounding subglacial exploration geophysics Meteorology. Climatology QC851-999 Edward C. King The precision of radar-derived subglacial bed topography: a case study from Pine Island Glacier, Antarctica |
topic_facet |
Glacier geophysics glaciological instruments and methods radio-echo sounding subglacial exploration geophysics Meteorology. Climatology QC851-999 |
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 |
Edward C. King |
author_facet |
Edward C. King |
author_sort |
Edward C. King |
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 |
https://doi.org/10.1017/aog.2020.33 https://doaj.org/article/19138144c4314f5682a415440ec009e3 |
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_source |
Annals of Glaciology, Vol 61, Pp 154-161 (2020) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305520000336/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2020.33 0260-3055 1727-5644 https://doaj.org/article/19138144c4314f5682a415440ec009e3 |
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_ |
1766001406197628928 |