Ice‐flow reorganization in West Antarctica 2.5 kyr ago dated using radar‐derived englacial flow velocities
Abstract We date a recent ice‐flow reorganization of an ice divide in the Weddell Sea Sector, West Antarctica, using a novel combination of inverse methods and ice‐penetrating radars. We invert for two‐dimensional ice flow within an ice divide from data collected with a phase‐sensitive ice‐penetrati...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2016-09-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL070278 |
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| author | Jonathan Kingslake Carlos Martín Robert J. Arthern Hugh F. J. Corr Edward C. King |
| author_facet | Jonathan Kingslake Carlos Martín Robert J. Arthern Hugh F. J. Corr Edward C. King |
| author_sort | Jonathan Kingslake |
| collection | DOAJ |
| description | Abstract We date a recent ice‐flow reorganization of an ice divide in the Weddell Sea Sector, West Antarctica, using a novel combination of inverse methods and ice‐penetrating radars. We invert for two‐dimensional ice flow within an ice divide from data collected with a phase‐sensitive ice‐penetrating radar while accounting for the effect of firn on radar propagation and ice flow. By comparing isochronal layers simulated using radar‐derived flow velocities with internal layers observed with an impulse radar, we show that the divide's internal structure is not in a steady state but underwent a disturbance, potentially implying a regional ice‐flow reorganization, 2.5 (1.8–2.9) kyr B.P. Our data are consistent with slow ice flow in this location before the reorganization and the ice divide subsequently remaining stationary. These findings increase our knowledge of the glacial history of a region that lacks dated constraints on late‐Holocene ice‐sheet retreat and provides a key target for models that reconstruct and predict ice‐sheet behavior. |
| format | Article |
| id | doaj-art-9165796f5a824e56b8d9490d514b0f09 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-09-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-9165796f5a824e56b8d9490d514b0f092025-08-20T01:52:04ZengWileyGeophysical Research Letters0094-82761944-80072016-09-0143179103911210.1002/2016GL070278Ice‐flow reorganization in West Antarctica 2.5 kyr ago dated using radar‐derived englacial flow velocitiesJonathan Kingslake0Carlos Martín1Robert J. Arthern2Hugh F. J. Corr3Edward C. King4Lamont‐Doherty Earth Observatory Palisades New York USABritish Antarctic Survey Natural Environmental Research Council Cambridge UKBritish Antarctic Survey Natural Environmental Research Council Cambridge UKBritish Antarctic Survey Natural Environmental Research Council Cambridge UKBritish Antarctic Survey Natural Environmental Research Council Cambridge UKAbstract We date a recent ice‐flow reorganization of an ice divide in the Weddell Sea Sector, West Antarctica, using a novel combination of inverse methods and ice‐penetrating radars. We invert for two‐dimensional ice flow within an ice divide from data collected with a phase‐sensitive ice‐penetrating radar while accounting for the effect of firn on radar propagation and ice flow. By comparing isochronal layers simulated using radar‐derived flow velocities with internal layers observed with an impulse radar, we show that the divide's internal structure is not in a steady state but underwent a disturbance, potentially implying a regional ice‐flow reorganization, 2.5 (1.8–2.9) kyr B.P. Our data are consistent with slow ice flow in this location before the reorganization and the ice divide subsequently remaining stationary. These findings increase our knowledge of the glacial history of a region that lacks dated constraints on late‐Holocene ice‐sheet retreat and provides a key target for models that reconstruct and predict ice‐sheet behavior.https://doi.org/10.1002/2016GL070278ice sheetsice flowpast ice flowice‐penetrating radarinverse methodsfield observations |
| spellingShingle | Jonathan Kingslake Carlos Martín Robert J. Arthern Hugh F. J. Corr Edward C. King Ice‐flow reorganization in West Antarctica 2.5 kyr ago dated using radar‐derived englacial flow velocities Geophysical Research Letters ice sheets ice flow past ice flow ice‐penetrating radar inverse methods field observations |
| title | Ice‐flow reorganization in West Antarctica 2.5 kyr ago dated using radar‐derived englacial flow velocities |
| title_full | Ice‐flow reorganization in West Antarctica 2.5 kyr ago dated using radar‐derived englacial flow velocities |
| title_fullStr | Ice‐flow reorganization in West Antarctica 2.5 kyr ago dated using radar‐derived englacial flow velocities |
| title_full_unstemmed | Ice‐flow reorganization in West Antarctica 2.5 kyr ago dated using radar‐derived englacial flow velocities |
| title_short | Ice‐flow reorganization in West Antarctica 2.5 kyr ago dated using radar‐derived englacial flow velocities |
| title_sort | ice flow reorganization in west antarctica 2 5 kyr ago dated using radar derived englacial flow velocities |
| topic | ice sheets ice flow past ice flow ice‐penetrating radar inverse methods field observations |
| url | https://doi.org/10.1002/2016GL070278 |
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