Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling
During the past 20 years, multi-channel radar emerged as a key tool for deciphering an ice sheet's internal architecture. To assign ages to radar reflections and connect them over large areas in the ice sheet, the layer genesis has to be understood on a microphysical scale. Synthetic radar trac...
Published in: | Journal of Glaciology |
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2022
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Online Access: | https://curis.ku.dk/portal/da/publications/origin-of-englacial-stratigraphy-at-three-deep-ice-core-sites-of-the-greenland-ice-sheet-by-synthetic-radar-modelling(7400a12e-0f46-4a6c-ab04-80b7cdedd73b).html https://doi.org/10.1017/jog.2021.137 https://curis.ku.dk/ws/files/302387030/origin_of_englacial_stratigraphy_at_three_deep_ice_core_sites_of_the_greenland_ice_sheet_by_synthetic_radar_modelling.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/7400a12e-0f46-4a6c-ab04-80b7cdedd73b 2024-06-09T07:39:11+00:00 Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling Mojtabavi, Seyedhamidreza Eisen, Olaf Franke, Steven Jansen, Daniela Steinhage, Daniel Paden, John Dahl-Jensen, Dorthe Weikusat, Ilka Eichler, Jan Wilhelms, Frank 2022-02-23 application/pdf https://curis.ku.dk/portal/da/publications/origin-of-englacial-stratigraphy-at-three-deep-ice-core-sites-of-the-greenland-ice-sheet-by-synthetic-radar-modelling(7400a12e-0f46-4a6c-ab04-80b7cdedd73b).html https://doi.org/10.1017/jog.2021.137 https://curis.ku.dk/ws/files/302387030/origin_of_englacial_stratigraphy_at_three_deep_ice_core_sites_of_the_greenland_ice_sheet_by_synthetic_radar_modelling.pdf eng eng info:eu-repo/semantics/openAccess Mojtabavi , S , Eisen , O , Franke , S , Jansen , D , Steinhage , D , Paden , J , Dahl-Jensen , D , Weikusat , I , Eichler , J & Wilhelms , F 2022 , ' Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling ' , Journal of Glaciology , vol. 68 , no. 270 , 0022143021001374 . https://doi.org/10.1017/jog.2021.137 Anisotropic ice ice core radio-echo sounding DOME-C EAST ANTARCTICA 1ST CHRONOLOGY ACCUMULATION PROFILES PATTERNS INTERIOR VELOCITY GRIP FLOW article 2022 ftcopenhagenunip https://doi.org/10.1017/jog.2021.137 2024-05-16T11:29:23Z During the past 20 years, multi-channel radar emerged as a key tool for deciphering an ice sheet's internal architecture. To assign ages to radar reflections and connect them over large areas in the ice sheet, the layer genesis has to be understood on a microphysical scale. Synthetic radar trace modelling based on the dielectric profile of ice cores allows for the assignation of observed physical properties' variations on the decimetre scale to radar reflectors extending from the coring site to a regional or even whole-ice-sheet scale. In this paper we rely on the available dielectric profiling data of the northern Greenland deep ice cores: NGRIP, NEEM and EGRIP. The three records are well suited for assigning an age model to the stratigraphic radar-mapped layers, and linking up the reflector properties to observations in the cores. Our modelling results show that the internal reflections are mainly due to conductivity changes. Furthermore, we deduce fabric characteristics at the EGRIP drill site from two-way-travel-time differences of along and across-flow polarized radarwave reflections of selected horizons (below 980 m). These indicate in deeper parts of the ice column an across-flow concentrated c-axis fabric. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Greenland GRIP ice core Ice Sheet Journal of Glaciology NGRIP University of Copenhagen: Research East Antarctica Greenland Journal of Glaciology 68 270 799 811 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
Anisotropic ice ice core radio-echo sounding DOME-C EAST ANTARCTICA 1ST CHRONOLOGY ACCUMULATION PROFILES PATTERNS INTERIOR VELOCITY GRIP FLOW |
spellingShingle |
Anisotropic ice ice core radio-echo sounding DOME-C EAST ANTARCTICA 1ST CHRONOLOGY ACCUMULATION PROFILES PATTERNS INTERIOR VELOCITY GRIP FLOW Mojtabavi, Seyedhamidreza Eisen, Olaf Franke, Steven Jansen, Daniela Steinhage, Daniel Paden, John Dahl-Jensen, Dorthe Weikusat, Ilka Eichler, Jan Wilhelms, Frank Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling |
topic_facet |
Anisotropic ice ice core radio-echo sounding DOME-C EAST ANTARCTICA 1ST CHRONOLOGY ACCUMULATION PROFILES PATTERNS INTERIOR VELOCITY GRIP FLOW |
description |
During the past 20 years, multi-channel radar emerged as a key tool for deciphering an ice sheet's internal architecture. To assign ages to radar reflections and connect them over large areas in the ice sheet, the layer genesis has to be understood on a microphysical scale. Synthetic radar trace modelling based on the dielectric profile of ice cores allows for the assignation of observed physical properties' variations on the decimetre scale to radar reflectors extending from the coring site to a regional or even whole-ice-sheet scale. In this paper we rely on the available dielectric profiling data of the northern Greenland deep ice cores: NGRIP, NEEM and EGRIP. The three records are well suited for assigning an age model to the stratigraphic radar-mapped layers, and linking up the reflector properties to observations in the cores. Our modelling results show that the internal reflections are mainly due to conductivity changes. Furthermore, we deduce fabric characteristics at the EGRIP drill site from two-way-travel-time differences of along and across-flow polarized radarwave reflections of selected horizons (below 980 m). These indicate in deeper parts of the ice column an across-flow concentrated c-axis fabric. |
format |
Article in Journal/Newspaper |
author |
Mojtabavi, Seyedhamidreza Eisen, Olaf Franke, Steven Jansen, Daniela Steinhage, Daniel Paden, John Dahl-Jensen, Dorthe Weikusat, Ilka Eichler, Jan Wilhelms, Frank |
author_facet |
Mojtabavi, Seyedhamidreza Eisen, Olaf Franke, Steven Jansen, Daniela Steinhage, Daniel Paden, John Dahl-Jensen, Dorthe Weikusat, Ilka Eichler, Jan Wilhelms, Frank |
author_sort |
Mojtabavi, Seyedhamidreza |
title |
Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling |
title_short |
Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling |
title_full |
Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling |
title_fullStr |
Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling |
title_full_unstemmed |
Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling |
title_sort |
origin of englacial stratigraphy at three deep ice core sites of the greenland ice sheet by synthetic radar modelling |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/origin-of-englacial-stratigraphy-at-three-deep-ice-core-sites-of-the-greenland-ice-sheet-by-synthetic-radar-modelling(7400a12e-0f46-4a6c-ab04-80b7cdedd73b).html https://doi.org/10.1017/jog.2021.137 https://curis.ku.dk/ws/files/302387030/origin_of_englacial_stratigraphy_at_three_deep_ice_core_sites_of_the_greenland_ice_sheet_by_synthetic_radar_modelling.pdf |
geographic |
East Antarctica Greenland |
geographic_facet |
East Antarctica Greenland |
genre |
Antarc* Antarctica East Antarctica Greenland GRIP ice core Ice Sheet Journal of Glaciology NGRIP |
genre_facet |
Antarc* Antarctica East Antarctica Greenland GRIP ice core Ice Sheet Journal of Glaciology NGRIP |
op_source |
Mojtabavi , S , Eisen , O , Franke , S , Jansen , D , Steinhage , D , Paden , J , Dahl-Jensen , D , Weikusat , I , Eichler , J & Wilhelms , F 2022 , ' Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling ' , Journal of Glaciology , vol. 68 , no. 270 , 0022143021001374 . https://doi.org/10.1017/jog.2021.137 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jog.2021.137 |
container_title |
Journal of Glaciology |
container_volume |
68 |
container_issue |
270 |
container_start_page |
799 |
op_container_end_page |
811 |
_version_ |
1801377850904805376 |