Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land
ABSTRACT We use ice flow modelling to simulate the englacial stratigraphy of Blåskimen Island, an ice rise in Dronning Maud Land and elucidate the evolution of this data-sparse region. We apply a thermo-mechanically coupled Elmer/Ice model to a profile along flowlines and through the ice-rise summit...
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Language: | English |
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/jog.2018.81 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000813 |
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crcambridgeupr:10.1017/jog.2018.81 2024-04-07T07:51:32+00:00 Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land GOEL, VIKRAM MARTÍN, CARLOS MATSUOKA, KENICHI 2018 http://dx.doi.org/10.1017/jog.2018.81 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000813 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 64, issue 248, page 932-942 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2018 crcambridgeupr https://doi.org/10.1017/jog.2018.81 2024-03-08T00:29:26Z ABSTRACT We use ice flow modelling to simulate the englacial stratigraphy of Blåskimen Island, an ice rise in Dronning Maud Land and elucidate the evolution of this data-sparse region. We apply a thermo-mechanically coupled Elmer/Ice model to a profile along flowlines and through the ice-rise summit, where surface mass balance (SMB), flow velocity and ice stratigraphy were recently measured. We conclude that: (i) the ice rise is presently thickening at a rate of 0.5~0.6 m ice equivalent per year (m ieq a −1 ), which is twice an earlier estimate using the field data and the input–output method; (ii) present thickening started 20–40 years in the past, before which the ice rise was in a steady state; (iii) SMB contrast between the upwind and downwind slopes was stronger than the present value by ~23% (or 0.15 m ieq a −1 ) prior to ~1100 years ago. Since then, this contrast has been decreasing overall. We surmise that these SMB changes are likely a result of synoptic-scale atmospheric changes, rather than local atmospheric changes controlled by local ice topography. Our technique effectively assimilates geophysical data, avoiding the complexity of ice flow beneath the ice divide. Thus, it could be applied to other ice rises to elucidate the recent glacial retreat. Article in Journal/Newspaper Blåskimen Island Dronning Maud Land Journal of Glaciology Cambridge University Press Dronning Maud Land Blåskimen ENVELOPE(-3.000,-3.000,-70.500,-70.500) Journal of Glaciology 64 248 932 942 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes GOEL, VIKRAM MARTÍN, CARLOS MATSUOKA, KENICHI Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land |
topic_facet |
Earth-Surface Processes |
description |
ABSTRACT We use ice flow modelling to simulate the englacial stratigraphy of Blåskimen Island, an ice rise in Dronning Maud Land and elucidate the evolution of this data-sparse region. We apply a thermo-mechanically coupled Elmer/Ice model to a profile along flowlines and through the ice-rise summit, where surface mass balance (SMB), flow velocity and ice stratigraphy were recently measured. We conclude that: (i) the ice rise is presently thickening at a rate of 0.5~0.6 m ice equivalent per year (m ieq a −1 ), which is twice an earlier estimate using the field data and the input–output method; (ii) present thickening started 20–40 years in the past, before which the ice rise was in a steady state; (iii) SMB contrast between the upwind and downwind slopes was stronger than the present value by ~23% (or 0.15 m ieq a −1 ) prior to ~1100 years ago. Since then, this contrast has been decreasing overall. We surmise that these SMB changes are likely a result of synoptic-scale atmospheric changes, rather than local atmospheric changes controlled by local ice topography. Our technique effectively assimilates geophysical data, avoiding the complexity of ice flow beneath the ice divide. Thus, it could be applied to other ice rises to elucidate the recent glacial retreat. |
format |
Article in Journal/Newspaper |
author |
GOEL, VIKRAM MARTÍN, CARLOS MATSUOKA, KENICHI |
author_facet |
GOEL, VIKRAM MARTÍN, CARLOS MATSUOKA, KENICHI |
author_sort |
GOEL, VIKRAM |
title |
Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land |
title_short |
Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land |
title_full |
Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land |
title_fullStr |
Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land |
title_full_unstemmed |
Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land |
title_sort |
ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in dronning maud land |
publisher |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/jog.2018.81 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143018000813 |
long_lat |
ENVELOPE(-3.000,-3.000,-70.500,-70.500) |
geographic |
Dronning Maud Land Blåskimen |
geographic_facet |
Dronning Maud Land Blåskimen |
genre |
Blåskimen Island Dronning Maud Land Journal of Glaciology |
genre_facet |
Blåskimen Island Dronning Maud Land Journal of Glaciology |
op_source |
Journal of Glaciology volume 64, issue 248, page 932-942 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2018.81 |
container_title |
Journal of Glaciology |
container_volume |
64 |
container_issue |
248 |
container_start_page |
932 |
op_container_end_page |
942 |
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1795666520924225536 |