Modelling historical and recent mass loss of McCall Glacier, Alaska, USA
International audience Volume loss of valley glaciers is now considered to be a significant contribution to sea level rise. Understanding and identifying the processes involved in accelerated mass loss are necessary to determine their impact on the global system. Here we present results from a serie...
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ftccsdartic:oai:HAL:hal-00298511v1 2023-11-12T04:17:24+01:00 Modelling historical and recent mass loss of McCall Glacier, Alaska, USA Delcourt, C. Pattyn, F. Nolan, M. Laboratoire de Glaciologie Département des Sciences de la Terre et de l'Environnement Institute of Northern Engineering 455 Duckering Bldg 2008-03-18 https://hal.science/hal-00298511 https://hal.science/hal-00298511/document https://hal.science/hal-00298511/file/tc-2-23-2008.pdf en eng HAL CCSD Copernicus hal-00298511 https://hal.science/hal-00298511 https://hal.science/hal-00298511/document https://hal.science/hal-00298511/file/tc-2-23-2008.pdf info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-00298511 The Cryosphere, 2008, 2 (1), pp.23-31 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2008 ftccsdartic 2023-10-21T23:15:03Z International audience Volume loss of valley glaciers is now considered to be a significant contribution to sea level rise. Understanding and identifying the processes involved in accelerated mass loss are necessary to determine their impact on the global system. Here we present results from a series of model experiments with a higher-order thermomechanically coupled flowline model (Pattyn, 2002). Boundary conditions to the model are parameterizations of surface mass balance, geothermal heating, observed surface and 10 m ice depth temperatures. The time-dependent experiments aim at simulating the glacier retreat from its LIA expansion to present according to different scenarios and model parameters. Model output was validated against measurements of ice velocity, ice surface elevation and terminus position at different stages. Results demonstrate that a key factor in determining the glacier retreat history is the importance of internal accumulation (>50%) in the total mass balance. The persistence of a basal temperate zone characteristic for this polythermal glacier depends largely on its contribution. Accelerated glacier retreat since the early nineties seems directly related to the increase in ELA and the sudden reduction in AAR due to the fact that a large lower elevation cirque ? previously an important accumulation area ? became part of the ablation zone. Article in Journal/Newspaper glacier glaciers The Cryosphere Alaska Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Ela ENVELOPE(9.642,9.642,63.170,63.170) McCall ENVELOPE(-66.619,-66.619,-67.029,-67.029) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Delcourt, C. Pattyn, F. Nolan, M. Modelling historical and recent mass loss of McCall Glacier, Alaska, USA |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Volume loss of valley glaciers is now considered to be a significant contribution to sea level rise. Understanding and identifying the processes involved in accelerated mass loss are necessary to determine their impact on the global system. Here we present results from a series of model experiments with a higher-order thermomechanically coupled flowline model (Pattyn, 2002). Boundary conditions to the model are parameterizations of surface mass balance, geothermal heating, observed surface and 10 m ice depth temperatures. The time-dependent experiments aim at simulating the glacier retreat from its LIA expansion to present according to different scenarios and model parameters. Model output was validated against measurements of ice velocity, ice surface elevation and terminus position at different stages. Results demonstrate that a key factor in determining the glacier retreat history is the importance of internal accumulation (>50%) in the total mass balance. The persistence of a basal temperate zone characteristic for this polythermal glacier depends largely on its contribution. Accelerated glacier retreat since the early nineties seems directly related to the increase in ELA and the sudden reduction in AAR due to the fact that a large lower elevation cirque ? previously an important accumulation area ? became part of the ablation zone. |
author2 |
Laboratoire de Glaciologie Département des Sciences de la Terre et de l'Environnement Institute of Northern Engineering 455 Duckering Bldg |
format |
Article in Journal/Newspaper |
author |
Delcourt, C. Pattyn, F. Nolan, M. |
author_facet |
Delcourt, C. Pattyn, F. Nolan, M. |
author_sort |
Delcourt, C. |
title |
Modelling historical and recent mass loss of McCall Glacier, Alaska, USA |
title_short |
Modelling historical and recent mass loss of McCall Glacier, Alaska, USA |
title_full |
Modelling historical and recent mass loss of McCall Glacier, Alaska, USA |
title_fullStr |
Modelling historical and recent mass loss of McCall Glacier, Alaska, USA |
title_full_unstemmed |
Modelling historical and recent mass loss of McCall Glacier, Alaska, USA |
title_sort |
modelling historical and recent mass loss of mccall glacier, alaska, usa |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00298511 https://hal.science/hal-00298511/document https://hal.science/hal-00298511/file/tc-2-23-2008.pdf |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) ENVELOPE(-66.619,-66.619,-67.029,-67.029) |
geographic |
Ela McCall |
geographic_facet |
Ela McCall |
genre |
glacier glaciers The Cryosphere Alaska |
genre_facet |
glacier glaciers The Cryosphere Alaska |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-00298511 The Cryosphere, 2008, 2 (1), pp.23-31 |
op_relation |
hal-00298511 https://hal.science/hal-00298511 https://hal.science/hal-00298511/document https://hal.science/hal-00298511/file/tc-2-23-2008.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782334308061544448 |