Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling
ABSTRACT Engabreen is an outlet glacier of the Svartisen Ice Cap located in Northern Norway. It is a unique glacier due to the Svartisen Subglacial Laboratory which allows direct access to the glacier bed. In this study, we combine both sub- and supraglacial observations with ice-flow modelling in o...
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crcambridgeupr:10.1017/jog.2018.45 2024-03-03T08:44:38+00:00 Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling SOLGAARD, ANNE M. MESSERLI, ALEXANDRA SCHELLENBERGER, THOMAS HVIDBERG, CHRISTINE S. GRINSTED, ASLAK JACKSON, MIRIAM ZWINGER, THOMAS KARLSSON, NANNA B. DAHL-JENSEN, DORTHE 2018 http://dx.doi.org/10.1017/jog.2018.45 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214301800045X en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 64, issue 246, page 555-567 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2018 crcambridgeupr https://doi.org/10.1017/jog.2018.45 2024-02-08T08:37:24Z ABSTRACT Engabreen is an outlet glacier of the Svartisen Ice Cap located in Northern Norway. It is a unique glacier due to the Svartisen Subglacial Laboratory which allows direct access to the glacier bed. In this study, we combine both sub- and supraglacial observations with ice-flow modelling in order to investigate conditions at the bed of Engabreen both spatially and temporally. We use the full-Stokes model Elmer/Ice and satellite-based surface-velocity maps from 2010 and 2014 to infer patterns of basal friction. Direct measurements of basal sliding and deformation of lower layers of the ice are used to adjust the ice viscosity and provide essential input to the setup of our model and influence the interpretation of the results. We find a clear seasonal cycle in the subglacial conditions at the higher elevation region of the study area and discuss this in relation to the subglacial hydrological system. Our results also reveal an area with an overdeepening where basal friction is significantly lower than elsewhere on the glacier all year round. We attribute this to either water pooling at the base, or saturated sediments and increased strain heating at this location which softens the ice further. Article in Journal/Newspaper glacier Ice cap Journal of Glaciology Northern Norway Svartisen Cambridge University Press Norway Svartisen ENVELOPE(13.698,13.698,66.642,66.642) Engabreen ENVELOPE(13.771,13.771,66.682,66.682) Journal of Glaciology 64 246 555 567 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes SOLGAARD, ANNE M. MESSERLI, ALEXANDRA SCHELLENBERGER, THOMAS HVIDBERG, CHRISTINE S. GRINSTED, ASLAK JACKSON, MIRIAM ZWINGER, THOMAS KARLSSON, NANNA B. DAHL-JENSEN, DORTHE Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling |
topic_facet |
Earth-Surface Processes |
description |
ABSTRACT Engabreen is an outlet glacier of the Svartisen Ice Cap located in Northern Norway. It is a unique glacier due to the Svartisen Subglacial Laboratory which allows direct access to the glacier bed. In this study, we combine both sub- and supraglacial observations with ice-flow modelling in order to investigate conditions at the bed of Engabreen both spatially and temporally. We use the full-Stokes model Elmer/Ice and satellite-based surface-velocity maps from 2010 and 2014 to infer patterns of basal friction. Direct measurements of basal sliding and deformation of lower layers of the ice are used to adjust the ice viscosity and provide essential input to the setup of our model and influence the interpretation of the results. We find a clear seasonal cycle in the subglacial conditions at the higher elevation region of the study area and discuss this in relation to the subglacial hydrological system. Our results also reveal an area with an overdeepening where basal friction is significantly lower than elsewhere on the glacier all year round. We attribute this to either water pooling at the base, or saturated sediments and increased strain heating at this location which softens the ice further. |
format |
Article in Journal/Newspaper |
author |
SOLGAARD, ANNE M. MESSERLI, ALEXANDRA SCHELLENBERGER, THOMAS HVIDBERG, CHRISTINE S. GRINSTED, ASLAK JACKSON, MIRIAM ZWINGER, THOMAS KARLSSON, NANNA B. DAHL-JENSEN, DORTHE |
author_facet |
SOLGAARD, ANNE M. MESSERLI, ALEXANDRA SCHELLENBERGER, THOMAS HVIDBERG, CHRISTINE S. GRINSTED, ASLAK JACKSON, MIRIAM ZWINGER, THOMAS KARLSSON, NANNA B. DAHL-JENSEN, DORTHE |
author_sort |
SOLGAARD, ANNE M. |
title |
Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling |
title_short |
Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling |
title_full |
Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling |
title_fullStr |
Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling |
title_full_unstemmed |
Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling |
title_sort |
basal conditions at engabreen, norway, inferred from surface measurements and inverse modelling |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/jog.2018.45 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214301800045X |
long_lat |
ENVELOPE(13.698,13.698,66.642,66.642) ENVELOPE(13.771,13.771,66.682,66.682) |
geographic |
Norway Svartisen Engabreen |
geographic_facet |
Norway Svartisen Engabreen |
genre |
glacier Ice cap Journal of Glaciology Northern Norway Svartisen |
genre_facet |
glacier Ice cap Journal of Glaciology Northern Norway Svartisen |
op_source |
Journal of Glaciology volume 64, issue 246, page 555-567 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2018.45 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
246 |
container_start_page |
555 |
op_container_end_page |
567 |
_version_ |
1792500125394796544 |