Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land
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 thermomechanically coupled Elmer/Ice model to a profile along flowlines and through the ice-rise summit, where su...
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Cambridge University Press
2018
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Online Access: | http://nora.nerc.ac.uk/id/eprint/521447/ https://nora.nerc.ac.uk/id/eprint/521447/1/10.1017_jog.2018.81.pdf https://doi.org/10.1017/jog.2018.81 |
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ftnerc:oai:nora.nerc.ac.uk:521447 2023-05-15T15:44:59+02:00 Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land Goel, Vikram Martin, Carlos Matsuoka, Kenichi 2018-12 text http://nora.nerc.ac.uk/id/eprint/521447/ https://nora.nerc.ac.uk/id/eprint/521447/1/10.1017_jog.2018.81.pdf https://doi.org/10.1017/jog.2018.81 en eng Cambridge University Press https://nora.nerc.ac.uk/id/eprint/521447/1/10.1017_jog.2018.81.pdf Goel, Vikram; Martin, Carlos orcid:0000-0002-2661-169X Matsuoka, Kenichi. 2018 Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land. Journal of Glaciology, 64 (248). 932-942. https://doi.org/10.1017/jog.2018.81 <https://doi.org/10.1017/jog.2018.81> cc_by_4 CC-BY Publication - Article PeerReviewed 2018 ftnerc https://doi.org/10.1017/jog.2018.81 2023-02-04T19:47:20Z 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 thermomechanically 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 (mieq 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 0.15mieq 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 Natural Environment Research Council: NERC Open Research Archive Dronning Maud Land Blåskimen ENVELOPE(-3.000,-3.000,-70.500,-70.500) Journal of Glaciology 64 248 932 942 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
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 thermomechanically 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 (mieq 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 0.15mieq 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 Martin, Carlos Matsuoka, Kenichi |
spellingShingle |
Goel, Vikram Martin, Carlos Matsuoka, Kenichi Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land |
author_facet |
Goel, Vikram Martin, 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 |
publishDate |
2018 |
url |
http://nora.nerc.ac.uk/id/eprint/521447/ https://nora.nerc.ac.uk/id/eprint/521447/1/10.1017_jog.2018.81.pdf https://doi.org/10.1017/jog.2018.81 |
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_relation |
https://nora.nerc.ac.uk/id/eprint/521447/1/10.1017_jog.2018.81.pdf Goel, Vikram; Martin, Carlos orcid:0000-0002-2661-169X Matsuoka, Kenichi. 2018 Ice-rise stratigraphy reveals changes in surface mass balance over the last millennia in Dronning Maud Land. Journal of Glaciology, 64 (248). 932-942. https://doi.org/10.1017/jog.2018.81 <https://doi.org/10.1017/jog.2018.81> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
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 |
_version_ |
1766379356817457152 |