A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers
Ice cliffs might be partly responsible for the high mass losses of debris-covered glaciers in the Hindu Kush-Karakoram-Himalaya region. The few existing models of cliff backwasting are point-scale models applied at few locations or assume cliffs to be planes with constant slope and aspect, a major s...
Published in: | Annals of Glaciology |
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Cambridge University Press
2016
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/27499/ https://doi.org/10.3189/2016AoG71A059 https://nrl.northumbria.ac.uk/id/eprint/27499/1/S0260305500000215a.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:27499 2023-05-15T13:29:39+02:00 A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers Buri, Pascal Pellicciotti, Francesca Steiner, Jakob Miles, Evan Immerzeel, Walter 2016-03-03 text https://nrl.northumbria.ac.uk/id/eprint/27499/ https://doi.org/10.3189/2016AoG71A059 https://nrl.northumbria.ac.uk/id/eprint/27499/1/S0260305500000215a.pdf en eng Cambridge University Press https://nrl.northumbria.ac.uk/id/eprint/27499/1/S0260305500000215a.pdf Buri, Pascal, Pellicciotti, Francesca, Steiner, Jakob, Miles, Evan and Immerzeel, Walter (2016) A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers. Annals of Glaciology, 57 (71). pp. 199-211. ISSN 0260-3055 cc_by_4_0 CC-BY F800 Physical and Terrestrial Geographical and Environmental Sciences Article PeerReviewed 2016 ftunivnorthumb https://doi.org/10.3189/2016AoG71A059 2022-09-25T06:04:17Z Ice cliffs might be partly responsible for the high mass losses of debris-covered glaciers in the Hindu Kush-Karakoram-Himalaya region. The few existing models of cliff backwasting are point-scale models applied at few locations or assume cliffs to be planes with constant slope and aspect, a major simplification given the complex surfaces of most cliffs. We develop the first grid-based model of cliff backwasting for two cliffs on debris-covered Lirung Glacier, Nepal. The model includes an improved representation of shortwave and longwave radiation, and their interplay with the glacier topography. Shortwave radiation varies considerably across the two cliffs, mostly due to direct radiation. Diffuse radiation is the major shortwave component, as the direct component is strongly reduced by the cliffs’ aspect and slope through self-shading. Incoming longwave radiation is higher than the total incoming shortwave flux, due to radiation emitted by the surrounding terrain, which is 25% of the incoming flux. Melt is highly variable in space, suggesting that simple models provide inaccurate estimates of total melt volumes. Although only representing 0.09% of the glacier tongue area, the total melt at the two cliffs over the measurement period is 2313 and 8282 m3, 1.23% of the total melt simulated by a glacio-hydrological model for the glacier’s tongue. Article in Journal/Newspaper Annals of Glaciology Northumbria University, Newcastle: Northumbria Research Link (NRL) Annals of Glaciology 57 71 199 211 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
spellingShingle |
F800 Physical and Terrestrial Geographical and Environmental Sciences Buri, Pascal Pellicciotti, Francesca Steiner, Jakob Miles, Evan Immerzeel, Walter A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers |
topic_facet |
F800 Physical and Terrestrial Geographical and Environmental Sciences |
description |
Ice cliffs might be partly responsible for the high mass losses of debris-covered glaciers in the Hindu Kush-Karakoram-Himalaya region. The few existing models of cliff backwasting are point-scale models applied at few locations or assume cliffs to be planes with constant slope and aspect, a major simplification given the complex surfaces of most cliffs. We develop the first grid-based model of cliff backwasting for two cliffs on debris-covered Lirung Glacier, Nepal. The model includes an improved representation of shortwave and longwave radiation, and their interplay with the glacier topography. Shortwave radiation varies considerably across the two cliffs, mostly due to direct radiation. Diffuse radiation is the major shortwave component, as the direct component is strongly reduced by the cliffs’ aspect and slope through self-shading. Incoming longwave radiation is higher than the total incoming shortwave flux, due to radiation emitted by the surrounding terrain, which is 25% of the incoming flux. Melt is highly variable in space, suggesting that simple models provide inaccurate estimates of total melt volumes. Although only representing 0.09% of the glacier tongue area, the total melt at the two cliffs over the measurement period is 2313 and 8282 m3, 1.23% of the total melt simulated by a glacio-hydrological model for the glacier’s tongue. |
format |
Article in Journal/Newspaper |
author |
Buri, Pascal Pellicciotti, Francesca Steiner, Jakob Miles, Evan Immerzeel, Walter |
author_facet |
Buri, Pascal Pellicciotti, Francesca Steiner, Jakob Miles, Evan Immerzeel, Walter |
author_sort |
Buri, Pascal |
title |
A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers |
title_short |
A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers |
title_full |
A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers |
title_fullStr |
A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers |
title_full_unstemmed |
A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers |
title_sort |
grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers |
publisher |
Cambridge University Press |
publishDate |
2016 |
url |
https://nrl.northumbria.ac.uk/id/eprint/27499/ https://doi.org/10.3189/2016AoG71A059 https://nrl.northumbria.ac.uk/id/eprint/27499/1/S0260305500000215a.pdf |
genre |
Annals of Glaciology |
genre_facet |
Annals of Glaciology |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/27499/1/S0260305500000215a.pdf Buri, Pascal, Pellicciotti, Francesca, Steiner, Jakob, Miles, Evan and Immerzeel, Walter (2016) A grid-based model of backwasting of supraglacial ice cliffs on debris-covered glaciers. Annals of Glaciology, 57 (71). pp. 199-211. ISSN 0260-3055 |
op_rights |
cc_by_4_0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3189/2016AoG71A059 |
container_title |
Annals of Glaciology |
container_volume |
57 |
container_issue |
71 |
container_start_page |
199 |
op_container_end_page |
211 |
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1766001806865858560 |