Subglacial hydrology modulates basal sliding response of the Antarctic ice sheet to climate forcing
Abstract. Major uncertainties in the response of ice sheets to environmental forcing are due to subglacial processes. These processes pertain to the type of sliding or friction law as well as the spatial and temporal evolution of the effective pressure at the base of ice sheets. We evaluate the clas...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/350947 2024-04-28T08:00:44+00:00 Subglacial hydrology modulates basal sliding response of the Antarctic ice sheet to climate forcing Kazmierczak, Elise Sun, Sainan Coulon, Violaine Pattyn, Frank 2022-10-01 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/350947 https://dipot.ulb.ac.be/dspace/bitstream/2013/350947/3/Kazmierczak2022_TC.pdf en eng uri/info:doi/10.5194/tc-16-4537-2022 uri/info:scp/85141944217 https://dipot.ulb.ac.be/dspace/bitstream/2013/350947/3/Kazmierczak2022_TC.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/350947 1 full-text file(s): info:eu-repo/semantics/openAccess The Cryosphere, 16 (10 Sciences exactes et naturelles info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2022 ftunivbruxelles 2024-04-10T00:12:21Z Abstract. Major uncertainties in the response of ice sheets to environmental forcing are due to subglacial processes. These processes pertain to the type of sliding or friction law as well as the spatial and temporal evolution of the effective pressure at the base of ice sheets. We evaluate the classic Weertman–Budd sliding law for different power exponents (viscous to near plastic) and for different representations of effective pressure at the base of the ice sheet, commonly used for hard and soft beds. The sensitivity of the above slip laws is evaluated for the Antarctic ice sheet in two types of experiments: (i) the ABUMIP experiments in which ice shelves are instantaneously removed, leading to rapid grounding-line retreat and ice sheet collapse, and (ii) the ISMIP6 experiments with realistic ocean and atmosphere forcings for different Representative Concentration Pathway (RCP) scenarios. Results confirm earlier work that the power in the sliding law is the most determining factor in the sensitivity of the ice sheet to climatic forcing, where a higher power in the sliding law leads to increased mass loss for a given forcing. Here we show that spatial and temporal changes in water pressure or water flux at the base modulate basal sliding for a given power, especially for high-end scenarios, such as ABUMIP. In particular, subglacial models depending on subglacial water pressure decrease effective pressure significantly near the grounding line, leading to an increased sensitivity to climatic forcing for a given power in the sliding law. This dependency is, however, less clear under realistic forcing scenarios (ISMIP6). SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelves The Cryosphere DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences exactes et naturelles |
spellingShingle |
Sciences exactes et naturelles Kazmierczak, Elise Sun, Sainan Coulon, Violaine Pattyn, Frank Subglacial hydrology modulates basal sliding response of the Antarctic ice sheet to climate forcing |
topic_facet |
Sciences exactes et naturelles |
description |
Abstract. Major uncertainties in the response of ice sheets to environmental forcing are due to subglacial processes. These processes pertain to the type of sliding or friction law as well as the spatial and temporal evolution of the effective pressure at the base of ice sheets. We evaluate the classic Weertman–Budd sliding law for different power exponents (viscous to near plastic) and for different representations of effective pressure at the base of the ice sheet, commonly used for hard and soft beds. The sensitivity of the above slip laws is evaluated for the Antarctic ice sheet in two types of experiments: (i) the ABUMIP experiments in which ice shelves are instantaneously removed, leading to rapid grounding-line retreat and ice sheet collapse, and (ii) the ISMIP6 experiments with realistic ocean and atmosphere forcings for different Representative Concentration Pathway (RCP) scenarios. Results confirm earlier work that the power in the sliding law is the most determining factor in the sensitivity of the ice sheet to climatic forcing, where a higher power in the sliding law leads to increased mass loss for a given forcing. Here we show that spatial and temporal changes in water pressure or water flux at the base modulate basal sliding for a given power, especially for high-end scenarios, such as ABUMIP. In particular, subglacial models depending on subglacial water pressure decrease effective pressure significantly near the grounding line, leading to an increased sensitivity to climatic forcing for a given power in the sliding law. This dependency is, however, less clear under realistic forcing scenarios (ISMIP6). SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Kazmierczak, Elise Sun, Sainan Coulon, Violaine Pattyn, Frank |
author_facet |
Kazmierczak, Elise Sun, Sainan Coulon, Violaine Pattyn, Frank |
author_sort |
Kazmierczak, Elise |
title |
Subglacial hydrology modulates basal sliding response of the Antarctic ice sheet to climate forcing |
title_short |
Subglacial hydrology modulates basal sliding response of the Antarctic ice sheet to climate forcing |
title_full |
Subglacial hydrology modulates basal sliding response of the Antarctic ice sheet to climate forcing |
title_fullStr |
Subglacial hydrology modulates basal sliding response of the Antarctic ice sheet to climate forcing |
title_full_unstemmed |
Subglacial hydrology modulates basal sliding response of the Antarctic ice sheet to climate forcing |
title_sort |
subglacial hydrology modulates basal sliding response of the antarctic ice sheet to climate forcing |
publishDate |
2022 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/350947 https://dipot.ulb.ac.be/dspace/bitstream/2013/350947/3/Kazmierczak2022_TC.pdf |
genre |
Antarc* Antarctic Ice Sheet Ice Shelves The Cryosphere |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelves The Cryosphere |
op_source |
The Cryosphere, 16 (10 |
op_relation |
uri/info:doi/10.5194/tc-16-4537-2022 uri/info:scp/85141944217 https://dipot.ulb.ac.be/dspace/bitstream/2013/350947/3/Kazmierczak2022_TC.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/350947 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1797572830461689856 |