Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes
Abstract Glacier ice thickness is crucial to quantifying water resources in mountain regions, and is an essential input for ice-flow models. Using a surface velocity inversion method, we combine ice thickness measurements with detailed surface elevation and velocity data, and derive ice thickness an...
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crcambridgeupr:10.1017/jog.2020.64 2024-09-15T18:15:39+00:00 Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes Zorzut, Valentina Ruiz, Lucas Rivera, Andres Pitte, Pierre Villalba, Ricardo Medrzycka, Dorota 2020 http://dx.doi.org/10.1017/jog.2020.64 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143020000647 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 66, issue 260, page 996-1005 ISSN 0022-1430 1727-5652 journal-article 2020 crcambridgeupr https://doi.org/10.1017/jog.2020.64 2024-07-10T04:00:54Z Abstract Glacier ice thickness is crucial to quantifying water resources in mountain regions, and is an essential input for ice-flow models. Using a surface velocity inversion method, we combine ice thickness measurements with detailed surface elevation and velocity data, and derive ice thickness and volume estimates for the Monte Tronador glaciers, North Patagonian Andes. We test the dependence of the inversion model on surface slope by resampling glacier slopes using variable smoothing filter sizes of 16–720 m. While total glacier volumes do not differ considerably, ice thickness estimates show higher variability depending on filter size. Smaller (larger) smoothing scales give thinner (thicker) ice and higher (lower) noise in ice thickness distribution. A filter size of 300 m, equivalent to four times the mean ice thickness, produces a noise-free thickness distribution with an accuracy of 35 m. We estimate the volume of the Monte Tronador glaciers at 4.8 ± 2 km 3 with a mean ice thickness of 75 m. Comparison of our results with earlier regional and global assessments shows that the quality of glacier inventories is a significant source of discrepancy. We show that including surface slope as an input parameter increases the accuracy of ice thickness distribution estimates. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 66 260 996 1005 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Glacier ice thickness is crucial to quantifying water resources in mountain regions, and is an essential input for ice-flow models. Using a surface velocity inversion method, we combine ice thickness measurements with detailed surface elevation and velocity data, and derive ice thickness and volume estimates for the Monte Tronador glaciers, North Patagonian Andes. We test the dependence of the inversion model on surface slope by resampling glacier slopes using variable smoothing filter sizes of 16–720 m. While total glacier volumes do not differ considerably, ice thickness estimates show higher variability depending on filter size. Smaller (larger) smoothing scales give thinner (thicker) ice and higher (lower) noise in ice thickness distribution. A filter size of 300 m, equivalent to four times the mean ice thickness, produces a noise-free thickness distribution with an accuracy of 35 m. We estimate the volume of the Monte Tronador glaciers at 4.8 ± 2 km 3 with a mean ice thickness of 75 m. Comparison of our results with earlier regional and global assessments shows that the quality of glacier inventories is a significant source of discrepancy. We show that including surface slope as an input parameter increases the accuracy of ice thickness distribution estimates. |
format |
Article in Journal/Newspaper |
author |
Zorzut, Valentina Ruiz, Lucas Rivera, Andres Pitte, Pierre Villalba, Ricardo Medrzycka, Dorota |
spellingShingle |
Zorzut, Valentina Ruiz, Lucas Rivera, Andres Pitte, Pierre Villalba, Ricardo Medrzycka, Dorota Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes |
author_facet |
Zorzut, Valentina Ruiz, Lucas Rivera, Andres Pitte, Pierre Villalba, Ricardo Medrzycka, Dorota |
author_sort |
Zorzut, Valentina |
title |
Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes |
title_short |
Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes |
title_full |
Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes |
title_fullStr |
Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes |
title_full_unstemmed |
Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes |
title_sort |
slope estimation influences on ice thickness inversion models: a case study for monte tronador glaciers, north patagonian andes |
publisher |
Cambridge University Press (CUP) |
publishDate |
2020 |
url |
http://dx.doi.org/10.1017/jog.2020.64 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143020000647 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 66, issue 260, page 996-1005 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2020.64 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
260 |
container_start_page |
996 |
op_container_end_page |
1005 |
_version_ |
1810453550355972096 |