Temporally stable surface mass balance asymmetry across an ice rise derived from radar internal reflection horizons through inverse modeling
ABSTRACT Ice rises are locally grounded parts of Antarctic ice shelves that play an important role in regulating ice flow from the continent towards the ocean. Because they protrude out of the otherwise horizontal ice shelves, ice rises induce an orographic uplift of the atmospheric flow, resulting...
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crcambridgeupr:10.1017/jog.2016.41 2024-04-07T07:47:36+00:00 Temporally stable surface mass balance asymmetry across an ice rise derived from radar internal reflection horizons through inverse modeling CALLENS, DENIS DREWS, REINHARD WITRANT, EMMANUEL PHILIPPE, MORGANE PATTYN, FRANK 2016 http://dx.doi.org/10.1017/jog.2016.41 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143016000411 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by-nc-sa/4.0/ Journal of Glaciology volume 62, issue 233, page 525-534 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2016 crcambridgeupr https://doi.org/10.1017/jog.2016.41 2024-03-08T00:32:50Z ABSTRACT Ice rises are locally grounded parts of Antarctic ice shelves that play an important role in regulating ice flow from the continent towards the ocean. Because they protrude out of the otherwise horizontal ice shelves, ice rises induce an orographic uplift of the atmospheric flow, resulting in an asymmetric distribution of the surface mass balance (SMB). Here, we combine younger and older internal reflection horizons (IRHs) from radar to quantify this distribution in time and space across Derwael Ice Rise (DIR), Dronning Maud Land, Antarctica. We employ two methods depending on the age of the IRHs, i.e. the shallow layer approximation for the younger IRHs near the surface and an optimization technique based on an ice flow model for the older IRHs. We identify an SMB ratio of 2.5 between the flanks and the ice divide with the SMB ranging between 300 and 750 kg m −2 a −1 . The SMB maximum is located on the upwind side, ~4 km offset to today's topographic divide. The large-scale asymmetry is consistently observed in time until 1966. The SMB from older IRHs is less-well constrained, but the asymmetry has likely persisted for >ka, indicating that DIR has been a stable features over long time spans. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land Ice Shelves Journal of Glaciology Cambridge University Press Antarctic Dronning Maud Land Journal of Glaciology 62 233 525 534 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes CALLENS, DENIS DREWS, REINHARD WITRANT, EMMANUEL PHILIPPE, MORGANE PATTYN, FRANK Temporally stable surface mass balance asymmetry across an ice rise derived from radar internal reflection horizons through inverse modeling |
topic_facet |
Earth-Surface Processes |
description |
ABSTRACT Ice rises are locally grounded parts of Antarctic ice shelves that play an important role in regulating ice flow from the continent towards the ocean. Because they protrude out of the otherwise horizontal ice shelves, ice rises induce an orographic uplift of the atmospheric flow, resulting in an asymmetric distribution of the surface mass balance (SMB). Here, we combine younger and older internal reflection horizons (IRHs) from radar to quantify this distribution in time and space across Derwael Ice Rise (DIR), Dronning Maud Land, Antarctica. We employ two methods depending on the age of the IRHs, i.e. the shallow layer approximation for the younger IRHs near the surface and an optimization technique based on an ice flow model for the older IRHs. We identify an SMB ratio of 2.5 between the flanks and the ice divide with the SMB ranging between 300 and 750 kg m −2 a −1 . The SMB maximum is located on the upwind side, ~4 km offset to today's topographic divide. The large-scale asymmetry is consistently observed in time until 1966. The SMB from older IRHs is less-well constrained, but the asymmetry has likely persisted for >ka, indicating that DIR has been a stable features over long time spans. |
format |
Article in Journal/Newspaper |
author |
CALLENS, DENIS DREWS, REINHARD WITRANT, EMMANUEL PHILIPPE, MORGANE PATTYN, FRANK |
author_facet |
CALLENS, DENIS DREWS, REINHARD WITRANT, EMMANUEL PHILIPPE, MORGANE PATTYN, FRANK |
author_sort |
CALLENS, DENIS |
title |
Temporally stable surface mass balance asymmetry across an ice rise derived from radar internal reflection horizons through inverse modeling |
title_short |
Temporally stable surface mass balance asymmetry across an ice rise derived from radar internal reflection horizons through inverse modeling |
title_full |
Temporally stable surface mass balance asymmetry across an ice rise derived from radar internal reflection horizons through inverse modeling |
title_fullStr |
Temporally stable surface mass balance asymmetry across an ice rise derived from radar internal reflection horizons through inverse modeling |
title_full_unstemmed |
Temporally stable surface mass balance asymmetry across an ice rise derived from radar internal reflection horizons through inverse modeling |
title_sort |
temporally stable surface mass balance asymmetry across an ice rise derived from radar internal reflection horizons through inverse modeling |
publisher |
Cambridge University Press (CUP) |
publishDate |
2016 |
url |
http://dx.doi.org/10.1017/jog.2016.41 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143016000411 |
geographic |
Antarctic Dronning Maud Land |
geographic_facet |
Antarctic Dronning Maud Land |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land Ice Shelves Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land Ice Shelves Journal of Glaciology |
op_source |
Journal of Glaciology volume 62, issue 233, page 525-534 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by-nc-sa/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2016.41 |
container_title |
Journal of Glaciology |
container_volume |
62 |
container_issue |
233 |
container_start_page |
525 |
op_container_end_page |
534 |
_version_ |
1795674715613822976 |