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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ftiiscindia:oai:eprints.iisc.ernet.in:52742 2023-05-15T16:57:37+02:00 Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya Schauwecker, Simone Rohrer, Mario Huggel, Christian Kulkarni, Anil Ramanathan, AL Salzmann, Nadine Stoffel, Markus Brock, Ben 2015 http://eprints.iisc.ernet.in/52742/ https://doi.org/10.3189/2015JoG14J102 unknown INT GLACIOL SOC Schauwecker, Simone and Rohrer, Mario and Huggel, Christian and Kulkarni, Anil and Ramanathan, AL and Salzmann, Nadine and Stoffel, Markus and Brock, Ben (2015) Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya. In: JOURNAL OF GLACIOLOGY, 61 (228). pp. 675-688. Others Journal Article PeerReviewed 2015 ftiiscindia https://doi.org/10.3189/2015JoG14J102 2015-11-13T23:12:46Z 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 Indian Institute of Science, Bangalore: ePrints@IIsc Indian Journal of Glaciology 61 228 675 688 |
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Indian Institute of Science, Bangalore: ePrints@IIsc |
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Others Schauwecker, Simone Rohrer, Mario 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 |
Others |
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 Rohrer, Mario Huggel, Christian Kulkarni, Anil Ramanathan, AL Salzmann, Nadine Stoffel, Markus Brock, Ben |
author_facet |
Schauwecker, Simone Rohrer, Mario Huggel, Christian Kulkarni, Anil Ramanathan, AL Salzmann, Nadine Stoffel, Markus Brock, Ben |
author_sort |
Schauwecker, Simone |
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 |
publisher |
INT GLACIOL SOC |
publishDate |
2015 |
url |
http://eprints.iisc.ernet.in/52742/ https://doi.org/10.3189/2015JoG14J102 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_relation |
Schauwecker, Simone and Rohrer, Mario and Huggel, Christian and Kulkarni, Anil and Ramanathan, AL and Salzmann, Nadine and Stoffel, Markus and Brock, Ben (2015) Remotely sensed debris thickness mapping of Bara Shigri Glacier, Indian Himalaya. In: JOURNAL OF GLACIOLOGY, 61 (228). pp. 675-688. |
op_doi |
https://doi.org/10.3189/2015JoG14J102 |
container_title |
Journal of Glaciology |
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61 |
container_issue |
228 |
container_start_page |
675 |
op_container_end_page |
688 |
_version_ |
1766049187785342976 |