High-resolution ice-thickness mapping in South Greenland
Airborne radar sounding is difficult in South Greenland because of the presence of englacial water, which prevents the signal from reaching the bed. Data coverage remains suboptimal for traditional methods of ice-thickness and bed mapping that rely on geostatistical techniques, such as kriging, beca...
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Language: | English |
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ftcdlib:qt62s979ms 2023-05-15T13:29:40+02:00 High-resolution ice-thickness mapping in South Greenland Morlighem, M Rignot, E Mouginot, J Seroussi, H Larour, E 64 - 70 2014-01-01 application/pdf http://www.escholarship.org/uc/item/62s979ms english eng eScholarship, University of California qt62s979ms http://www.escholarship.org/uc/item/62s979ms Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Morlighem, M; Rignot, E; Mouginot, J; Seroussi, H; & Larour, E. (2014). High-resolution ice-thickness mapping in South Greenland. Annals of Glaciology, 55(67), 64 - 70. doi:10.3189/2014AoG67A088. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/62s979ms article 2014 ftcdlib https://doi.org/10.3189/2014AoG67A088 2018-07-13T22:53:56Z Airborne radar sounding is difficult in South Greenland because of the presence of englacial water, which prevents the signal from reaching the bed. Data coverage remains suboptimal for traditional methods of ice-thickness and bed mapping that rely on geostatistical techniques, such as kriging, because important features are missing. Here we apply two alternative approaches of highresolution (̃300 m) ice-thickness mapping, that are based on the conservation of mass, to two regions of South Greenland: (1) Qooqqup Sermia and Kiattuut Sermiat, and (2) Ikertivaq. These two algorithms solve optimization problems, for which the conservation of mass is either enforced as a hard constraint, or as a soft constraint. For the first region, very few measurements are available but there is no gap in ice motion data, whereas for Ikertivaq, more ice-thickness measurements are available, but there are gaps in ice motion data. We show that mass-conservation algorithms can be used as validation tools for radar sounding. We also show that it is preferable to apply mass conservation as a hard constraint, rather than a soft constraint, as it better preserves elongated features, such as glacial valleys and ridges. Article in Journal/Newspaper Annals of Glaciology Greenland University of California: eScholarship Greenland Ikertivaq ENVELOPE(-39.667,-39.667,65.483,65.483) Kiattuut Sermiat ENVELOPE(-45.267,-45.267,61.267,61.267) Annals of Glaciology 55 67 64 70 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
description |
Airborne radar sounding is difficult in South Greenland because of the presence of englacial water, which prevents the signal from reaching the bed. Data coverage remains suboptimal for traditional methods of ice-thickness and bed mapping that rely on geostatistical techniques, such as kriging, because important features are missing. Here we apply two alternative approaches of highresolution (̃300 m) ice-thickness mapping, that are based on the conservation of mass, to two regions of South Greenland: (1) Qooqqup Sermia and Kiattuut Sermiat, and (2) Ikertivaq. These two algorithms solve optimization problems, for which the conservation of mass is either enforced as a hard constraint, or as a soft constraint. For the first region, very few measurements are available but there is no gap in ice motion data, whereas for Ikertivaq, more ice-thickness measurements are available, but there are gaps in ice motion data. We show that mass-conservation algorithms can be used as validation tools for radar sounding. We also show that it is preferable to apply mass conservation as a hard constraint, rather than a soft constraint, as it better preserves elongated features, such as glacial valleys and ridges. |
format |
Article in Journal/Newspaper |
author |
Morlighem, M Rignot, E Mouginot, J Seroussi, H Larour, E |
spellingShingle |
Morlighem, M Rignot, E Mouginot, J Seroussi, H Larour, E High-resolution ice-thickness mapping in South Greenland |
author_facet |
Morlighem, M Rignot, E Mouginot, J Seroussi, H Larour, E |
author_sort |
Morlighem, M |
title |
High-resolution ice-thickness mapping in South Greenland |
title_short |
High-resolution ice-thickness mapping in South Greenland |
title_full |
High-resolution ice-thickness mapping in South Greenland |
title_fullStr |
High-resolution ice-thickness mapping in South Greenland |
title_full_unstemmed |
High-resolution ice-thickness mapping in South Greenland |
title_sort |
high-resolution ice-thickness mapping in south greenland |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
http://www.escholarship.org/uc/item/62s979ms |
op_coverage |
64 - 70 |
long_lat |
ENVELOPE(-39.667,-39.667,65.483,65.483) ENVELOPE(-45.267,-45.267,61.267,61.267) |
geographic |
Greenland Ikertivaq Kiattuut Sermiat |
geographic_facet |
Greenland Ikertivaq Kiattuut Sermiat |
genre |
Annals of Glaciology Greenland |
genre_facet |
Annals of Glaciology Greenland |
op_source |
Morlighem, M; Rignot, E; Mouginot, J; Seroussi, H; & Larour, E. (2014). High-resolution ice-thickness mapping in South Greenland. Annals of Glaciology, 55(67), 64 - 70. doi:10.3189/2014AoG67A088. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/62s979ms |
op_relation |
qt62s979ms http://www.escholarship.org/uc/item/62s979ms |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3189/2014AoG67A088 |
container_title |
Annals of Glaciology |
container_volume |
55 |
container_issue |
67 |
container_start_page |
64 |
op_container_end_page |
70 |
_version_ |
1766001870627667968 |