Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model
In East Antarctica surface mass balance data can only be obtained from the sparsely distributed ice cores when considering time periods greater than a few decades. Observations of internal layers measured by airborne ice penetrating radar, in principle, permit extrapolation of mass balance informati...
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ftnerc:oai:nora.nerc.ac.uk:14642 2023-05-15T13:45:11+02:00 Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model Leysinger Vieli, Gwendolyn J.-M.C. Hindmarsh, Richard C.A. Siegert, Martin G. Bo, Sun 2011-06 text http://nora.nerc.ac.uk/id/eprint/14642/ https://nora.nerc.ac.uk/id/eprint/14642/1/jgrf781.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2010JF001785 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/14642/1/jgrf781.pdf Leysinger Vieli, Gwendolyn J.-M.C.; Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 Siegert, Martin G.; Bo, Sun. 2011 Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model. Journal of Geophysical Research, 116 (F2), F02018. 17, pp. https://doi.org/10.1029/2010JF001785 <https://doi.org/10.1029/2010JF001785> Glaciology Publication - Article PeerReviewed 2011 ftnerc https://doi.org/10.1029/2010JF001785 2023-02-04T19:29:23Z In East Antarctica surface mass balance data can only be obtained from the sparsely distributed ice cores when considering time periods greater than a few decades. Observations of internal layers measured by airborne ice penetrating radar, in principle, permit extrapolation of mass balance information from these ice cores. We use radar survey lines gathered in the 1970s, and a three‐dimensional numerical model, to investigate the feasibility of such extrapolation, seeking to match the calculations of englacial layer geometry with observations. First, we justify the use of a three‐dimensional model by showing that simple vertical flow models cannot explain all the observations and that horizontal advection is a significant glacial process. Then we examine processes that affect calculations of layer geometry, finding that spatial accumulation‐rate patterns are extremely important while geothermal heat flux and flow mode (sliding or internal deformation) are of substantially less importance. Where the layer is from the Last Glacial Maximum (17.5 ka), we find a very good match between the spatial pattern of accumulation rates inferred from this layer and the modern spatial pattern of accumulation rates. When considering deeper layers from beyond the current interglacial, we find that a different spatial accumulation‐rate pattern must have existed, in addition to the known change in accumulation rate from ice cores. The glacial spatial accumulation‐rate pattern would have had proportionally greater accumulation at the South Pole than now, compared with the Vostok and Dome C ice cores. Article in Journal/Newspaper Antarc* Antarctica East Antarctica South pole South pole Natural Environment Research Council: NERC Open Research Archive East Antarctica South Pole Journal of Geophysical Research: Earth Surface 116 F2 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Glaciology |
spellingShingle |
Glaciology Leysinger Vieli, Gwendolyn J.-M.C. Hindmarsh, Richard C.A. Siegert, Martin G. Bo, Sun Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model |
topic_facet |
Glaciology |
description |
In East Antarctica surface mass balance data can only be obtained from the sparsely distributed ice cores when considering time periods greater than a few decades. Observations of internal layers measured by airborne ice penetrating radar, in principle, permit extrapolation of mass balance information from these ice cores. We use radar survey lines gathered in the 1970s, and a three‐dimensional numerical model, to investigate the feasibility of such extrapolation, seeking to match the calculations of englacial layer geometry with observations. First, we justify the use of a three‐dimensional model by showing that simple vertical flow models cannot explain all the observations and that horizontal advection is a significant glacial process. Then we examine processes that affect calculations of layer geometry, finding that spatial accumulation‐rate patterns are extremely important while geothermal heat flux and flow mode (sliding or internal deformation) are of substantially less importance. Where the layer is from the Last Glacial Maximum (17.5 ka), we find a very good match between the spatial pattern of accumulation rates inferred from this layer and the modern spatial pattern of accumulation rates. When considering deeper layers from beyond the current interglacial, we find that a different spatial accumulation‐rate pattern must have existed, in addition to the known change in accumulation rate from ice cores. The glacial spatial accumulation‐rate pattern would have had proportionally greater accumulation at the South Pole than now, compared with the Vostok and Dome C ice cores. |
format |
Article in Journal/Newspaper |
author |
Leysinger Vieli, Gwendolyn J.-M.C. Hindmarsh, Richard C.A. Siegert, Martin G. Bo, Sun |
author_facet |
Leysinger Vieli, Gwendolyn J.-M.C. Hindmarsh, Richard C.A. Siegert, Martin G. Bo, Sun |
author_sort |
Leysinger Vieli, Gwendolyn J.-M.C. |
title |
Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model |
title_short |
Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model |
title_full |
Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model |
title_fullStr |
Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model |
title_full_unstemmed |
Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model |
title_sort |
time-dependence of the spatial pattern of accumulation rate in east antarctica deduced from isochronic radar layers using a 3d numerical ice-flow model |
publisher |
American Geophysical Union |
publishDate |
2011 |
url |
http://nora.nerc.ac.uk/id/eprint/14642/ https://nora.nerc.ac.uk/id/eprint/14642/1/jgrf781.pdf https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2010JF001785 |
geographic |
East Antarctica South Pole |
geographic_facet |
East Antarctica South Pole |
genre |
Antarc* Antarctica East Antarctica South pole South pole |
genre_facet |
Antarc* Antarctica East Antarctica South pole South pole |
op_relation |
https://nora.nerc.ac.uk/id/eprint/14642/1/jgrf781.pdf Leysinger Vieli, Gwendolyn J.-M.C.; Hindmarsh, Richard C.A. orcid:0000-0003-1633-2416 Siegert, Martin G.; Bo, Sun. 2011 Time-dependence of the spatial pattern of accumulation rate in East Antarctica deduced from isochronic radar layers using a 3D numerical ice-flow model. Journal of Geophysical Research, 116 (F2), F02018. 17, pp. https://doi.org/10.1029/2010JF001785 <https://doi.org/10.1029/2010JF001785> |
op_doi |
https://doi.org/10.1029/2010JF001785 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
116 |
container_issue |
F2 |
_version_ |
1766215749785878528 |