Modelling historical and recent mass loss of McCall Glacier, Alaska, USA
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...
Published in: | The Cryosphere |
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Copernicus Publications
2008
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00031696 2023-05-15T16:20:28+02:00 Modelling historical and recent mass loss of McCall Glacier, Alaska, USA Delcourt, C. Pattyn, F. Nolan, M. 2008-03 electronic https://doi.org/10.5194/tc-2-23-2008 https://noa.gwlb.de/receive/cop_mods_00031696 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031650/tc-2-23-2008.pdf https://tc.copernicus.org/articles/2/23/2008/tc-2-23-2008.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-2-23-2008 https://noa.gwlb.de/receive/cop_mods_00031696 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031650/tc-2-23-2008.pdf https://tc.copernicus.org/articles/2/23/2008/tc-2-23-2008.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2008 ftnonlinearchiv https://doi.org/10.5194/tc-2-23-2008 2022-02-08T22:46:37Z 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 Niedersächsisches Online-Archiv NOA Ela ENVELOPE(9.642,9.642,63.170,63.170) McCall ENVELOPE(-66.619,-66.619,-67.029,-67.029) The Cryosphere 2 1 23 31 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Delcourt, C. Pattyn, F. Nolan, M. Modelling historical and recent mass loss of McCall Glacier, Alaska, USA |
topic_facet |
article Verlagsveröffentlichung |
description |
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. |
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 |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/tc-2-23-2008 https://noa.gwlb.de/receive/cop_mods_00031696 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031650/tc-2-23-2008.pdf https://tc.copernicus.org/articles/2/23/2008/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_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-2-23-2008 https://noa.gwlb.de/receive/cop_mods_00031696 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031650/tc-2-23-2008.pdf https://tc.copernicus.org/articles/2/23/2008/tc-2-23-2008.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-2-23-2008 |
container_title |
The Cryosphere |
container_volume |
2 |
container_issue |
1 |
container_start_page |
23 |
op_container_end_page |
31 |
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1766008386310111232 |