Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia
Ice rises situated in the ice-shelf belt around Antarctica have a spatially confined flow regime with local ice divides. Beneath the divides, ice stratigraphy often develops arches with amplitudes that record the divide's horizontal residence time and surface elevation changes. To investigate t...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/199461 2023-05-15T13:37:29+02:00 Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia Drews, Reinhard Matsuoka, Kenichi Carlos, Martin CM Denis, Callens DC Nicolas, Bergeot NB Pattyn, Frank 2015-03-01 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/199461 https://dipot.ulb.ac.be/dspace/bitstream/2013/199461/1/ProofDrews.pdf other unknown uri/info:doi/10.1002/2014JF003246 uri/info:scp/84927659556 https://dipot.ulb.ac.be/dspace/bitstream/2013/199461/1/ProofDrews.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/199461 1 full-text file(s): info:eu-repo/semantics/openAccess Journal of Geophysical Research F: Earth Surface, 120 (3 Sciences exactes et naturelles evolution glaciology ice rise info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2015 ftunivbruxelles 2022-06-12T22:09:17Z Ice rises situated in the ice-shelf belt around Antarctica have a spatially confined flow regime with local ice divides. Beneath the divides, ice stratigraphy often develops arches with amplitudes that record the divide's horizontal residence time and surface elevation changes. To investigate the evolution of Derwael Ice Rise, Dronning Maud Land, Antarctica, we combine radar and GPS data from three consecutive surveys, with a two-dimensional, full Stokes, thermomechanically coupled, transient ice-flow model. We find that the surface mass balance (SMB) is higher on the upwind and lower on the downwind slopes. Near the crest, the SMB is anomalously low and causes arches to form in the shallow stratigraphy, observable by radar. In deeper ice, arches are consequently imprinted by both SMB and ice rheology (Raymond effect). The data show how arch amplitudes decrease as along-ridge slope increases, emphasizing that the lateral positioning of radar cross sections is important for the arch interpretation. Using the model with three rheologies (isotropic with n=3,4.5 and anisotropic with n=3), we show that Derwael Ice Rise is close to steady state but is best explained using ice anisotropy and moderate thinning. Our preferred, albeit not unique, scenario suggests that the ice divide has existed for at least 5000 years and lowered at approximately 0.03 m a−1 over the last 3400 years. Independent of the specific thinning scenario, our modeling suggests that Derwael Ice Rise has exhibited a local flow regime at least since the Mid-Holocene. SCOPUS: ar.j SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land Ice Shelf DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Dronning Maud Land The Arch ENVELOPE(-55.981,-55.981,49.700,49.700) Crest The ENVELOPE(-56.992,-56.992,-63.406,-63.406) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
unknown |
topic |
Sciences exactes et naturelles evolution glaciology ice rise |
spellingShingle |
Sciences exactes et naturelles evolution glaciology ice rise Drews, Reinhard Matsuoka, Kenichi Carlos, Martin CM Denis, Callens DC Nicolas, Bergeot NB Pattyn, Frank Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia |
topic_facet |
Sciences exactes et naturelles evolution glaciology ice rise |
description |
Ice rises situated in the ice-shelf belt around Antarctica have a spatially confined flow regime with local ice divides. Beneath the divides, ice stratigraphy often develops arches with amplitudes that record the divide's horizontal residence time and surface elevation changes. To investigate the evolution of Derwael Ice Rise, Dronning Maud Land, Antarctica, we combine radar and GPS data from three consecutive surveys, with a two-dimensional, full Stokes, thermomechanically coupled, transient ice-flow model. We find that the surface mass balance (SMB) is higher on the upwind and lower on the downwind slopes. Near the crest, the SMB is anomalously low and causes arches to form in the shallow stratigraphy, observable by radar. In deeper ice, arches are consequently imprinted by both SMB and ice rheology (Raymond effect). The data show how arch amplitudes decrease as along-ridge slope increases, emphasizing that the lateral positioning of radar cross sections is important for the arch interpretation. Using the model with three rheologies (isotropic with n=3,4.5 and anisotropic with n=3), we show that Derwael Ice Rise is close to steady state but is best explained using ice anisotropy and moderate thinning. Our preferred, albeit not unique, scenario suggests that the ice divide has existed for at least 5000 years and lowered at approximately 0.03 m a−1 over the last 3400 years. Independent of the specific thinning scenario, our modeling suggests that Derwael Ice Rise has exhibited a local flow regime at least since the Mid-Holocene. SCOPUS: ar.j SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Drews, Reinhard Matsuoka, Kenichi Carlos, Martin CM Denis, Callens DC Nicolas, Bergeot NB Pattyn, Frank |
author_facet |
Drews, Reinhard Matsuoka, Kenichi Carlos, Martin CM Denis, Callens DC Nicolas, Bergeot NB Pattyn, Frank |
author_sort |
Drews, Reinhard |
title |
Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia |
title_short |
Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia |
title_full |
Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia |
title_fullStr |
Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia |
title_full_unstemmed |
Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia |
title_sort |
evolution of derwael ice rise in dronning maud land, antarctica, over the last millennia |
publishDate |
2015 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/199461 https://dipot.ulb.ac.be/dspace/bitstream/2013/199461/1/ProofDrews.pdf |
long_lat |
ENVELOPE(-55.981,-55.981,49.700,49.700) ENVELOPE(-56.992,-56.992,-63.406,-63.406) |
geographic |
Dronning Maud Land The Arch Crest The |
geographic_facet |
Dronning Maud Land The Arch Crest The |
genre |
Antarc* Antarctica Dronning Maud Land Ice Shelf |
genre_facet |
Antarc* Antarctica Dronning Maud Land Ice Shelf |
op_source |
Journal of Geophysical Research F: Earth Surface, 120 (3 |
op_relation |
uri/info:doi/10.1002/2014JF003246 uri/info:scp/84927659556 https://dipot.ulb.ac.be/dspace/bitstream/2013/199461/1/ProofDrews.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/199461 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/openAccess |
_version_ |
1766092538886750208 |