Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes
Englacial temperature is a major control on ice rheology and flow. However, it is difficult to measure at the glacier to ice-sheet scale. As a result, ice-sheet models must make assumptions about englacial temperature and rheology, which affect sea level projections. This is problematic if fundament...
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Cambridge University Press
2016
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ftdoajarticles:oai:doaj.org/article:2212a5e66b954740a0daa8aa054a37f7 2023-05-15T14:02:04+02:00 Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes DUSTIN M. SCHROEDER HELENE SEROUSSI WINNIE CHU DUNCAN A. YOUNG 2016-12-01T00:00:00Z https://doi.org/10.1017/jog.2016.100 https://doaj.org/article/2212a5e66b954740a0daa8aa054a37f7 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143016001003/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2016.100 0022-1430 1727-5652 https://doaj.org/article/2212a5e66b954740a0daa8aa054a37f7 Journal of Glaciology, Vol 62, Pp 1075-1082 (2016) attenuation ice penetrating radar temperature thwaites glacier Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2016 ftdoajarticles https://doi.org/10.1017/jog.2016.100 2023-03-12T01:30:59Z Englacial temperature is a major control on ice rheology and flow. However, it is difficult to measure at the glacier to ice-sheet scale. As a result, ice-sheet models must make assumptions about englacial temperature and rheology, which affect sea level projections. This is problematic if fundamental processes are not captured by models due to a lack of observationally constrained ice temperature values. Although radar sounding data have been exploited to constrain the temperature structure of the Greenland ice sheet using englacial layers, this approach is limited to areas and depths where these layers exist intact. In order to extend empirical radar-based temperature estimation beyond this limitation, we present a new technique for estimating englacial attenuation rates for the entire ice column using adaptive fitting of unfocused radar bed echoes based on the correlation of ice thickness and corrected bed echo power. We apply this technique to an airborne survey of Thwaites Glacier in West Antarctica and compare the results with temperatures and attenuation rates from a numerical ice-sheet model. We find that the estimated attenuation rates reproduce modelled patterns and values across the catchment with the greatest differences near steeply sloping bed topography. Article in Journal/Newspaper Antarc* Antarctica glacier Greenland Ice Sheet Journal of Glaciology Thwaites Glacier West Antarctica Directory of Open Access Journals: DOAJ Articles West Antarctica Greenland Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) Journal of Glaciology 62 236 1075 1082 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
attenuation ice penetrating radar temperature thwaites glacier Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
attenuation ice penetrating radar temperature thwaites glacier Environmental sciences GE1-350 Meteorology. Climatology QC851-999 DUSTIN M. SCHROEDER HELENE SEROUSSI WINNIE CHU DUNCAN A. YOUNG Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes |
topic_facet |
attenuation ice penetrating radar temperature thwaites glacier Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Englacial temperature is a major control on ice rheology and flow. However, it is difficult to measure at the glacier to ice-sheet scale. As a result, ice-sheet models must make assumptions about englacial temperature and rheology, which affect sea level projections. This is problematic if fundamental processes are not captured by models due to a lack of observationally constrained ice temperature values. Although radar sounding data have been exploited to constrain the temperature structure of the Greenland ice sheet using englacial layers, this approach is limited to areas and depths where these layers exist intact. In order to extend empirical radar-based temperature estimation beyond this limitation, we present a new technique for estimating englacial attenuation rates for the entire ice column using adaptive fitting of unfocused radar bed echoes based on the correlation of ice thickness and corrected bed echo power. We apply this technique to an airborne survey of Thwaites Glacier in West Antarctica and compare the results with temperatures and attenuation rates from a numerical ice-sheet model. We find that the estimated attenuation rates reproduce modelled patterns and values across the catchment with the greatest differences near steeply sloping bed topography. |
format |
Article in Journal/Newspaper |
author |
DUSTIN M. SCHROEDER HELENE SEROUSSI WINNIE CHU DUNCAN A. YOUNG |
author_facet |
DUSTIN M. SCHROEDER HELENE SEROUSSI WINNIE CHU DUNCAN A. YOUNG |
author_sort |
DUSTIN M. SCHROEDER |
title |
Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes |
title_short |
Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes |
title_full |
Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes |
title_fullStr |
Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes |
title_full_unstemmed |
Adaptively constraining radar attenuation and temperature across the Thwaites Glacier catchment using bed echoes |
title_sort |
adaptively constraining radar attenuation and temperature across the thwaites glacier catchment using bed echoes |
publisher |
Cambridge University Press |
publishDate |
2016 |
url |
https://doi.org/10.1017/jog.2016.100 https://doaj.org/article/2212a5e66b954740a0daa8aa054a37f7 |
long_lat |
ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
West Antarctica Greenland Thwaites Glacier |
geographic_facet |
West Antarctica Greenland Thwaites Glacier |
genre |
Antarc* Antarctica glacier Greenland Ice Sheet Journal of Glaciology Thwaites Glacier West Antarctica |
genre_facet |
Antarc* Antarctica glacier Greenland Ice Sheet Journal of Glaciology Thwaites Glacier West Antarctica |
op_source |
Journal of Glaciology, Vol 62, Pp 1075-1082 (2016) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143016001003/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2016.100 0022-1430 1727-5652 https://doaj.org/article/2212a5e66b954740a0daa8aa054a37f7 |
op_doi |
https://doi.org/10.1017/jog.2016.100 |
container_title |
Journal of Glaciology |
container_volume |
62 |
container_issue |
236 |
container_start_page |
1075 |
op_container_end_page |
1082 |
_version_ |
1766272146187747328 |