In the Quest of a Parametric Relation Between Ice Sheet Model Inferred Weertman's Sliding‐Law Parameter and Airborne Radar‐Derived Basal Reflectivity Underneath Thwaites Glacier, Antarctica
Abstract Numerical ice sheet models use sliding laws to connect basal shear stress and ice velocity to simulate ice sliding. A sliding‐law parameter β2 is used to control Weertman's sliding law in numerical ice sheet models. Basal reflectivity derived from ice‐penetrating radar also provides in...
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ftdoajarticles:oai:doaj.org/article:705c80c3fe484093a1735883d4d23a43 2024-09-15T17:43:05+00:00 In the Quest of a Parametric Relation Between Ice Sheet Model Inferred Weertman's Sliding‐Law Parameter and Airborne Radar‐Derived Basal Reflectivity Underneath Thwaites Glacier, Antarctica Indrani Das Mathieu Morlighem Jowan Barnes G. Hilmar Gudmundsson Daniel Goldberg Thiago Dias dos Santos 2023-05-01T00:00:00Z https://doi.org/10.1029/2022GL098910 https://doaj.org/article/705c80c3fe484093a1735883d4d23a43 EN eng Wiley https://doi.org/10.1029/2022GL098910 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2022GL098910 https://doaj.org/article/705c80c3fe484093a1735883d4d23a43 Geophysical Research Letters, Vol 50, Iss 10, Pp n/a-n/a (2023) Thwaites Glacier Weertman's sliding law basal reflectivity statistical correlation Geophysics. Cosmic physics QC801-809 article 2023 ftdoajarticles https://doi.org/10.1029/2022GL098910 2024-08-05T17:49:23Z Abstract Numerical ice sheet models use sliding laws to connect basal shear stress and ice velocity to simulate ice sliding. A sliding‐law parameter β2 is used to control Weertman's sliding law in numerical ice sheet models. Basal reflectivity derived from ice‐penetrating radar also provides information about frozen or thawed conditions underneath glaciers. To assess whether basal reflectivity can be used to constrain β2, we carry out statistical experiments between two recently published datasets: β2 inferred from three numerical ice sheet models (ISSM, Úa and STREAMICE) and airborne radar‐derived relative basal reflectivity from the AGASEA‐BBAS mission over Thwaites Glacier (TG). Our results show no robust correlation between the β2–relative reflectivity pair. Pearson's correlation coefficient, a test of linearity, ranges from −0.26 to −0.38. Spearman's correlation coefficient, which does not require a linear assumption, is also modest (∼−0.35). We conclude that β2 and relative basal reflectivity underneath TG do not infer similar basal conditions. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Thwaites Glacier Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 50 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Thwaites Glacier Weertman's sliding law basal reflectivity statistical correlation Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Thwaites Glacier Weertman's sliding law basal reflectivity statistical correlation Geophysics. Cosmic physics QC801-809 Indrani Das Mathieu Morlighem Jowan Barnes G. Hilmar Gudmundsson Daniel Goldberg Thiago Dias dos Santos In the Quest of a Parametric Relation Between Ice Sheet Model Inferred Weertman's Sliding‐Law Parameter and Airborne Radar‐Derived Basal Reflectivity Underneath Thwaites Glacier, Antarctica |
topic_facet |
Thwaites Glacier Weertman's sliding law basal reflectivity statistical correlation Geophysics. Cosmic physics QC801-809 |
description |
Abstract Numerical ice sheet models use sliding laws to connect basal shear stress and ice velocity to simulate ice sliding. A sliding‐law parameter β2 is used to control Weertman's sliding law in numerical ice sheet models. Basal reflectivity derived from ice‐penetrating radar also provides information about frozen or thawed conditions underneath glaciers. To assess whether basal reflectivity can be used to constrain β2, we carry out statistical experiments between two recently published datasets: β2 inferred from three numerical ice sheet models (ISSM, Úa and STREAMICE) and airborne radar‐derived relative basal reflectivity from the AGASEA‐BBAS mission over Thwaites Glacier (TG). Our results show no robust correlation between the β2–relative reflectivity pair. Pearson's correlation coefficient, a test of linearity, ranges from −0.26 to −0.38. Spearman's correlation coefficient, which does not require a linear assumption, is also modest (∼−0.35). We conclude that β2 and relative basal reflectivity underneath TG do not infer similar basal conditions. |
format |
Article in Journal/Newspaper |
author |
Indrani Das Mathieu Morlighem Jowan Barnes G. Hilmar Gudmundsson Daniel Goldberg Thiago Dias dos Santos |
author_facet |
Indrani Das Mathieu Morlighem Jowan Barnes G. Hilmar Gudmundsson Daniel Goldberg Thiago Dias dos Santos |
author_sort |
Indrani Das |
title |
In the Quest of a Parametric Relation Between Ice Sheet Model Inferred Weertman's Sliding‐Law Parameter and Airborne Radar‐Derived Basal Reflectivity Underneath Thwaites Glacier, Antarctica |
title_short |
In the Quest of a Parametric Relation Between Ice Sheet Model Inferred Weertman's Sliding‐Law Parameter and Airborne Radar‐Derived Basal Reflectivity Underneath Thwaites Glacier, Antarctica |
title_full |
In the Quest of a Parametric Relation Between Ice Sheet Model Inferred Weertman's Sliding‐Law Parameter and Airborne Radar‐Derived Basal Reflectivity Underneath Thwaites Glacier, Antarctica |
title_fullStr |
In the Quest of a Parametric Relation Between Ice Sheet Model Inferred Weertman's Sliding‐Law Parameter and Airborne Radar‐Derived Basal Reflectivity Underneath Thwaites Glacier, Antarctica |
title_full_unstemmed |
In the Quest of a Parametric Relation Between Ice Sheet Model Inferred Weertman's Sliding‐Law Parameter and Airborne Radar‐Derived Basal Reflectivity Underneath Thwaites Glacier, Antarctica |
title_sort |
in the quest of a parametric relation between ice sheet model inferred weertman's sliding‐law parameter and airborne radar‐derived basal reflectivity underneath thwaites glacier, antarctica |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2022GL098910 https://doaj.org/article/705c80c3fe484093a1735883d4d23a43 |
genre |
Antarc* Antarctica Ice Sheet Thwaites Glacier |
genre_facet |
Antarc* Antarctica Ice Sheet Thwaites Glacier |
op_source |
Geophysical Research Letters, Vol 50, Iss 10, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2022GL098910 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2022GL098910 https://doaj.org/article/705c80c3fe484093a1735883d4d23a43 |
op_doi |
https://doi.org/10.1029/2022GL098910 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
10 |
_version_ |
1810489922228846592 |