Annual cycle in flow of Ross Ice Shelf, Antarctica: contribution of variable basal melting
International audience Ice shelves play a critical role in modulating dynamic loss of ice from the grounded portion of the Antarctic Ice Sheet and its contribution to sea-level rise. Measurements of ice-shelf motion provide insights into processes modifying buttressing. Here we investigate the effec...
Published in: | Journal of Glaciology |
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Format: | Article in Journal/Newspaper |
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Online Access: | https://hal.science/hal-03033704 https://hal.science/hal-03033704/document https://hal.science/hal-03033704/file/Klein_JOG_2020.pdf https://doi.org/10.1017/jog.2020.61 |
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ftinsu:oai:HAL:hal-03033704v1 2024-02-11T09:57:11+01:00 Annual cycle in flow of Ross Ice Shelf, Antarctica: contribution of variable basal melting Klein, Emilie Mosbeux, Cyrille Bromirski, Peter, D Padman, Laurie Bock, Yehuda Springer, Scott, R Fricker, Helen, A Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) Institute of Geophysics and Planetary Physics San Diego (IGPP) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC)-University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) Earth and Space Research, Corvallis, OR, USA (ESR) Earth and Space Research Institute Seattle (ESR) 2020-08-03 https://hal.science/hal-03033704 https://hal.science/hal-03033704/document https://hal.science/hal-03033704/file/Klein_JOG_2020.pdf https://doi.org/10.1017/jog.2020.61 en eng HAL CCSD International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2020.61 hal-03033704 https://hal.science/hal-03033704 https://hal.science/hal-03033704/document https://hal.science/hal-03033704/file/Klein_JOG_2020.pdf doi:10.1017/jog.2020.61 info:eu-repo/semantics/OpenAccess ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.science/hal-03033704 Journal of Glaciology, 2020, 66, pp.861 - 875. ⟨10.1017/jog.2020.61⟩ Antarctic glaciology ice/ocean interactions ice shelves [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.1017/jog.2020.61 2024-01-17T17:27:12Z International audience Ice shelves play a critical role in modulating dynamic loss of ice from the grounded portion of the Antarctic Ice Sheet and its contribution to sea-level rise. Measurements of ice-shelf motion provide insights into processes modifying buttressing. Here we investigate the effect of seasonal variability of basal melting on ice flow of Ross Ice Shelf. Velocities were measured from November 2015 to December 2016 at 12 GPS stations deployed from the ice front to 430 km upstream. The flow-parallel velocity anomaly at each station, relative to the annual mean, was small during early austral summer (November-January), negative during February-April, and positive during austral winter (May-September). The maximum velocity anomaly reached several metres per year at most stations. We used a 2-D ice-sheet model of the RIS and its grounded tributaries to explore the seasonal response of the ice sheet to time-varying basal melt rates. We find that melt-rate response to changes in summer upper-ocean heating near the ice front will affect the future flow of RIS and its tributary glaciers. However, modelled seasonal flow variations from increased summer basal melting near the ice front are much smaller than observed, suggesting that other as-yet-unidentified seasonal processes are currently dominant. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology Ross Ice Shelf Institut national des sciences de l'Univers: HAL-INSU Antarctic Austral Ross Ice Shelf The Antarctic Journal of Glaciology 66 259 861 875 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Antarctic glaciology ice/ocean interactions ice shelves [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
Antarctic glaciology ice/ocean interactions ice shelves [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Klein, Emilie Mosbeux, Cyrille Bromirski, Peter, D Padman, Laurie Bock, Yehuda Springer, Scott, R Fricker, Helen, A Annual cycle in flow of Ross Ice Shelf, Antarctica: contribution of variable basal melting |
topic_facet |
Antarctic glaciology ice/ocean interactions ice shelves [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience Ice shelves play a critical role in modulating dynamic loss of ice from the grounded portion of the Antarctic Ice Sheet and its contribution to sea-level rise. Measurements of ice-shelf motion provide insights into processes modifying buttressing. Here we investigate the effect of seasonal variability of basal melting on ice flow of Ross Ice Shelf. Velocities were measured from November 2015 to December 2016 at 12 GPS stations deployed from the ice front to 430 km upstream. The flow-parallel velocity anomaly at each station, relative to the annual mean, was small during early austral summer (November-January), negative during February-April, and positive during austral winter (May-September). The maximum velocity anomaly reached several metres per year at most stations. We used a 2-D ice-sheet model of the RIS and its grounded tributaries to explore the seasonal response of the ice sheet to time-varying basal melt rates. We find that melt-rate response to changes in summer upper-ocean heating near the ice front will affect the future flow of RIS and its tributary glaciers. However, modelled seasonal flow variations from increased summer basal melting near the ice front are much smaller than observed, suggesting that other as-yet-unidentified seasonal processes are currently dominant. |
author2 |
Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL) Institute of Geophysics and Planetary Physics San Diego (IGPP) Scripps Institution of Oceanography (SIO - UC San Diego) University of California San Diego (UC San Diego) University of California (UC)-University of California (UC)-University of California San Diego (UC San Diego) University of California (UC)-University of California (UC) Earth and Space Research, Corvallis, OR, USA (ESR) Earth and Space Research Institute Seattle (ESR) |
format |
Article in Journal/Newspaper |
author |
Klein, Emilie Mosbeux, Cyrille Bromirski, Peter, D Padman, Laurie Bock, Yehuda Springer, Scott, R Fricker, Helen, A |
author_facet |
Klein, Emilie Mosbeux, Cyrille Bromirski, Peter, D Padman, Laurie Bock, Yehuda Springer, Scott, R Fricker, Helen, A |
author_sort |
Klein, Emilie |
title |
Annual cycle in flow of Ross Ice Shelf, Antarctica: contribution of variable basal melting |
title_short |
Annual cycle in flow of Ross Ice Shelf, Antarctica: contribution of variable basal melting |
title_full |
Annual cycle in flow of Ross Ice Shelf, Antarctica: contribution of variable basal melting |
title_fullStr |
Annual cycle in flow of Ross Ice Shelf, Antarctica: contribution of variable basal melting |
title_full_unstemmed |
Annual cycle in flow of Ross Ice Shelf, Antarctica: contribution of variable basal melting |
title_sort |
annual cycle in flow of ross ice shelf, antarctica: contribution of variable basal melting |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03033704 https://hal.science/hal-03033704/document https://hal.science/hal-03033704/file/Klein_JOG_2020.pdf https://doi.org/10.1017/jog.2020.61 |
geographic |
Antarctic Austral Ross Ice Shelf The Antarctic |
geographic_facet |
Antarctic Austral Ross Ice Shelf The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology Ross Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology Ross Ice Shelf |
op_source |
ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://hal.science/hal-03033704 Journal of Glaciology, 2020, 66, pp.861 - 875. ⟨10.1017/jog.2020.61⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/jog.2020.61 hal-03033704 https://hal.science/hal-03033704 https://hal.science/hal-03033704/document https://hal.science/hal-03033704/file/Klein_JOG_2020.pdf doi:10.1017/jog.2020.61 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1017/jog.2020.61 |
container_title |
Journal of Glaciology |
container_volume |
66 |
container_issue |
259 |
container_start_page |
861 |
op_container_end_page |
875 |
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1790609354637967360 |