Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya
Despite the important role of supraglacial debris in ablation, knowledge of debris thickness on Himalayan glaciers is sparse. A recently developed method based on reanalysis data and thermal band satellite imagery has proved to be potentially suitable for debris thickness estimation without the need...
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ftunivgeneve:oai:unige.ch:unige:121949 2023-05-15T16:57:29+02:00 Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya Schauwecker, Simone Marianna Rohrer, Mario Bruno Huggel, Christian Kulkarni, Anil Ramanathan, Al. Salzmann, Nadine Stoffel, Markus Brock, Ben 2015 https://archive-ouverte.unige.ch/unige:121949 eng eng info:eu-repo/semantics/altIdentifier/doi/10.3189/2015JoG14J102 unige:121949 https://archive-ouverte.unige.ch/unige:121949 info:eu-repo/semantics/restrictedAccess ISSN: 0022-1430 Journal of Glaciology, Vol. 61, No 228 (2015) pp. 675-688 info:eu-repo/classification/ddc/333.7-333.9 Text info:eu-repo/semantics/article Article scientifique info:eu-repo/semantics/publishedVersion 2015 ftunivgeneve https://doi.org/10.3189/2015JoG14J102 2022-02-08T22:29:46Z Despite the important role of supraglacial debris in ablation, knowledge of debris thickness on Himalayan glaciers is sparse. A recently developed method based on reanalysis data and thermal band satellite imagery has proved to be potentially suitable for debris thickness estimation without the need for detailed field data. In this study, we further develop the method and discuss possibilities and limitations arising from its application to a glacier in the Himalaya with scarce in situ data. Surface temperature patterns are consistent for 13 scenes of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Landsat 7 imagery and correlate well with incoming shortwave radiation and air temperature. We use an energy-balance approach to subtract these radiation or air temperature effects, in order to estimate debris thickness patterns as a function of surface temperature. Both incoming shortwave and longwave radiation are estimated with reasonable accuracy when applying parameterizations and reanalysis data. However, the model likely underestimates debris thickness, probably due to incorrect representation of vertical debris temperature profiles, the rate of heat storage and turbulent sensible heat flux. Moreover, the uncertainty of the result was found to increase significantly with thicker debris, a promising result since ablation is enhanced by thin debris of 1–2 cm. Article in Journal/Newspaper Journal of Glaciology Université de Genève: Archive ouverte UNIGE Indian Journal of Glaciology 61 228 675 688 |
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Université de Genève: Archive ouverte UNIGE |
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ftunivgeneve |
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English |
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info:eu-repo/classification/ddc/333.7-333.9 |
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info:eu-repo/classification/ddc/333.7-333.9 Schauwecker, Simone Marianna Rohrer, Mario Bruno Huggel, Christian Kulkarni, Anil Ramanathan, Al. Salzmann, Nadine Stoffel, Markus Brock, Ben Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya |
topic_facet |
info:eu-repo/classification/ddc/333.7-333.9 |
description |
Despite the important role of supraglacial debris in ablation, knowledge of debris thickness on Himalayan glaciers is sparse. A recently developed method based on reanalysis data and thermal band satellite imagery has proved to be potentially suitable for debris thickness estimation without the need for detailed field data. In this study, we further develop the method and discuss possibilities and limitations arising from its application to a glacier in the Himalaya with scarce in situ data. Surface temperature patterns are consistent for 13 scenes of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Landsat 7 imagery and correlate well with incoming shortwave radiation and air temperature. We use an energy-balance approach to subtract these radiation or air temperature effects, in order to estimate debris thickness patterns as a function of surface temperature. Both incoming shortwave and longwave radiation are estimated with reasonable accuracy when applying parameterizations and reanalysis data. However, the model likely underestimates debris thickness, probably due to incorrect representation of vertical debris temperature profiles, the rate of heat storage and turbulent sensible heat flux. Moreover, the uncertainty of the result was found to increase significantly with thicker debris, a promising result since ablation is enhanced by thin debris of 1–2 cm. |
format |
Article in Journal/Newspaper |
author |
Schauwecker, Simone Marianna Rohrer, Mario Bruno Huggel, Christian Kulkarni, Anil Ramanathan, Al. Salzmann, Nadine Stoffel, Markus Brock, Ben |
author_facet |
Schauwecker, Simone Marianna Rohrer, Mario Bruno Huggel, Christian Kulkarni, Anil Ramanathan, Al. Salzmann, Nadine Stoffel, Markus Brock, Ben |
author_sort |
Schauwecker, Simone Marianna |
title |
Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya |
title_short |
Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya |
title_full |
Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya |
title_fullStr |
Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya |
title_full_unstemmed |
Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya |
title_sort |
remotely sensed debris thickness mapping of bara shigri glacier, indian himalaya |
publishDate |
2015 |
url |
https://archive-ouverte.unige.ch/unige:121949 |
geographic |
Indian |
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Indian |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
ISSN: 0022-1430 Journal of Glaciology, Vol. 61, No 228 (2015) pp. 675-688 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3189/2015JoG14J102 unige:121949 https://archive-ouverte.unige.ch/unige:121949 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.3189/2015JoG14J102 |
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Journal of Glaciology |
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61 |
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228 |
container_start_page |
675 |
op_container_end_page |
688 |
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1766049034567417856 |