Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling
Ice shelves surrounding the Antarctic perimeter moderate ice discharge towards the ocean through buttressing. Ice-shelf evolution and integrity depend on the local surface accumulation, basal melting and on the spatially variable ice-shelf viscosity. These components of ice-shelf mass balance are of...
Published in: | The Cryosphere |
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Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications (EGU)
2022
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Online Access: | https://oceanrep.geomar.de/id/eprint/59030/ https://oceanrep.geomar.de/id/eprint/59030/1/tc-16-4763-2022-corrigendum.pdf https://oceanrep.geomar.de/id/eprint/59030/2/tc-16-4763-2022.pdf https://tc.copernicus.org/articles/16/4763/2022/ https://doi.org/10.5194/tc-16-4763-2022 |
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ftoceanrep:oai:oceanrep.geomar.de:59030 2024-02-11T09:58:14+01:00 Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling Visnjevic, Vjeran Drews, Reinhard Schannwell, Clemens Koch, Inka Franke, Steven Jansen, Daniela Eisen, Olaf 2022-11-23 text https://oceanrep.geomar.de/id/eprint/59030/ https://oceanrep.geomar.de/id/eprint/59030/1/tc-16-4763-2022-corrigendum.pdf https://oceanrep.geomar.de/id/eprint/59030/2/tc-16-4763-2022.pdf https://tc.copernicus.org/articles/16/4763/2022/ https://doi.org/10.5194/tc-16-4763-2022 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/59030/1/tc-16-4763-2022-corrigendum.pdf https://oceanrep.geomar.de/id/eprint/59030/2/tc-16-4763-2022.pdf Visnjevic, V., Drews, R., Schannwell, C., Koch, I., Franke, S., Jansen, D. and Eisen, O. (2022) Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling. Open Access The Cryosphere, 16 (11). pp. 4763-4777. DOI 10.5194/tc-16-4763-2022 <https://doi.org/10.5194/tc-16-4763-2022>. doi:10.5194/tc-16-4763-2022 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2022 ftoceanrep https://doi.org/10.5194/tc-16-4763-2022 2024-01-15T00:27:33Z Ice shelves surrounding the Antarctic perimeter moderate ice discharge towards the ocean through buttressing. Ice-shelf evolution and integrity depend on the local surface accumulation, basal melting and on the spatially variable ice-shelf viscosity. These components of ice-shelf mass balance are often poorly constrained by observations and introduce uncertainties in ice-sheet projections. Isochronal radar stratigraphy is an observational archive for the atmospheric, oceanographic and ice-flow history of ice shelves. Here, we predict the stratigraphy of locally accumulated ice on ice shelves with a kinematic forward model for a given atmospheric and oceanographic scenario. This delineates the boundary between local meteoric ice (LMI) and continental meteoric ice (CMI). A large LMI to CMI ratio hereby marks ice shelves whose buttressing strength is more sensitive to changes in atmospheric precipitation patterns. A mismatch between the steady-state predictions of the kinematic forward model and observations from radar can highlight inconsistencies in the atmospheric and oceanographic input data or be an indicator for a transient ice-shelf history not accounted for in the model. We discuss pitfalls in numerical diffusion when calculating the age field and validate the kinematic model with the full Stokes ice-flow model Elmer/Ice. The Roi Baudouin Ice Shelf (East Antarctica) serves as a test case for this approach. There, we find a significant east–west gradient in the LMI / CMI ratio. The steady-state predictions concur with observations on larger spatial scales (>10 km), but deviations on smaller scales are significant, e.g., because local surface accumulation patterns near the grounding zone are underestimated in Antarctic-wide estimates. Future studies can use these mismatches to optimize the input data or to pinpoint transient signatures in the ice-shelf history using the ever growing archive of radar observations of internal ice stratigraphy. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves The Cryosphere OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic East Antarctica Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) The Antarctic The Cryosphere 16 11 4763 4777 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Ice shelves surrounding the Antarctic perimeter moderate ice discharge towards the ocean through buttressing. Ice-shelf evolution and integrity depend on the local surface accumulation, basal melting and on the spatially variable ice-shelf viscosity. These components of ice-shelf mass balance are often poorly constrained by observations and introduce uncertainties in ice-sheet projections. Isochronal radar stratigraphy is an observational archive for the atmospheric, oceanographic and ice-flow history of ice shelves. Here, we predict the stratigraphy of locally accumulated ice on ice shelves with a kinematic forward model for a given atmospheric and oceanographic scenario. This delineates the boundary between local meteoric ice (LMI) and continental meteoric ice (CMI). A large LMI to CMI ratio hereby marks ice shelves whose buttressing strength is more sensitive to changes in atmospheric precipitation patterns. A mismatch between the steady-state predictions of the kinematic forward model and observations from radar can highlight inconsistencies in the atmospheric and oceanographic input data or be an indicator for a transient ice-shelf history not accounted for in the model. We discuss pitfalls in numerical diffusion when calculating the age field and validate the kinematic model with the full Stokes ice-flow model Elmer/Ice. The Roi Baudouin Ice Shelf (East Antarctica) serves as a test case for this approach. There, we find a significant east–west gradient in the LMI / CMI ratio. The steady-state predictions concur with observations on larger spatial scales (>10 km), but deviations on smaller scales are significant, e.g., because local surface accumulation patterns near the grounding zone are underestimated in Antarctic-wide estimates. Future studies can use these mismatches to optimize the input data or to pinpoint transient signatures in the ice-shelf history using the ever growing archive of radar observations of internal ice stratigraphy. |
format |
Article in Journal/Newspaper |
author |
Visnjevic, Vjeran Drews, Reinhard Schannwell, Clemens Koch, Inka Franke, Steven Jansen, Daniela Eisen, Olaf |
spellingShingle |
Visnjevic, Vjeran Drews, Reinhard Schannwell, Clemens Koch, Inka Franke, Steven Jansen, Daniela Eisen, Olaf Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling |
author_facet |
Visnjevic, Vjeran Drews, Reinhard Schannwell, Clemens Koch, Inka Franke, Steven Jansen, Daniela Eisen, Olaf |
author_sort |
Visnjevic, Vjeran |
title |
Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling |
title_short |
Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling |
title_full |
Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling |
title_fullStr |
Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling |
title_full_unstemmed |
Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling |
title_sort |
predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling |
publisher |
Copernicus Publications (EGU) |
publishDate |
2022 |
url |
https://oceanrep.geomar.de/id/eprint/59030/ https://oceanrep.geomar.de/id/eprint/59030/1/tc-16-4763-2022-corrigendum.pdf https://oceanrep.geomar.de/id/eprint/59030/2/tc-16-4763-2022.pdf https://tc.copernicus.org/articles/16/4763/2022/ https://doi.org/10.5194/tc-16-4763-2022 |
long_lat |
ENVELOPE(24.461,24.461,-70.438,-70.438) |
geographic |
Antarctic East Antarctica Roi Baudouin The Antarctic |
geographic_facet |
Antarctic East Antarctica Roi Baudouin The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves The Cryosphere |
op_relation |
https://oceanrep.geomar.de/id/eprint/59030/1/tc-16-4763-2022-corrigendum.pdf https://oceanrep.geomar.de/id/eprint/59030/2/tc-16-4763-2022.pdf Visnjevic, V., Drews, R., Schannwell, C., Koch, I., Franke, S., Jansen, D. and Eisen, O. (2022) Predicting the steady-state isochronal stratigraphy of ice shelves using observations and modeling. Open Access The Cryosphere, 16 (11). pp. 4763-4777. DOI 10.5194/tc-16-4763-2022 <https://doi.org/10.5194/tc-16-4763-2022>. doi:10.5194/tc-16-4763-2022 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-16-4763-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
11 |
container_start_page |
4763 |
op_container_end_page |
4777 |
_version_ |
1790593841730945024 |