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...
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Cambridge University Press
2022
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Online Access: | https://doi.org/10.1017/jog.2021.137 https://doaj.org/article/3c7f436ec5da43ccb41fea72d2e50157 |
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ftdoajarticles:oai:doaj.org/article:3c7f436ec5da43ccb41fea72d2e50157 2023-05-15T16:28:08+02:00 Origin of englacial stratigraphy at three deep ice core sites of the Greenland Ice Sheet by synthetic radar modelling Seyedhamidreza Mojtabavi Olaf Eisen Steven Franke Daniela Jansen Daniel Steinhage John Paden Dorthe Dahl-Jensen Ilka Weikusat Jan Eichler Frank Wilhelms 2022-08-01T00:00:00Z https://doi.org/10.1017/jog.2021.137 https://doaj.org/article/3c7f436ec5da43ccb41fea72d2e50157 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143021001374/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.137 0022-1430 1727-5652 https://doaj.org/article/3c7f436ec5da43ccb41fea72d2e50157 Journal of Glaciology, Vol 68, Pp 799-811 (2022) Anisotropic ice ice core radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2022 ftdoajarticles https://doi.org/10.1017/jog.2021.137 2023-03-12T01:30:54Z 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 Greenland ice core Ice Sheet Journal of Glaciology NGRIP Directory of Open Access Journals: DOAJ Articles Greenland Journal of Glaciology 68 270 799 811 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Anisotropic ice ice core radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Anisotropic ice ice core radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Seyedhamidreza Mojtabavi Olaf Eisen Steven Franke Daniela Jansen Daniel Steinhage John Paden Dorthe Dahl-Jensen Ilka Weikusat Jan Eichler Frank Wilhelms 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 Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
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 |
Seyedhamidreza Mojtabavi Olaf Eisen Steven Franke Daniela Jansen Daniel Steinhage John Paden Dorthe Dahl-Jensen Ilka Weikusat Jan Eichler Frank Wilhelms |
author_facet |
Seyedhamidreza Mojtabavi Olaf Eisen Steven Franke Daniela Jansen Daniel Steinhage John Paden Dorthe Dahl-Jensen Ilka Weikusat Jan Eichler Frank Wilhelms |
author_sort |
Seyedhamidreza Mojtabavi |
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 |
publisher |
Cambridge University Press |
publishDate |
2022 |
url |
https://doi.org/10.1017/jog.2021.137 https://doaj.org/article/3c7f436ec5da43ccb41fea72d2e50157 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet Journal of Glaciology NGRIP |
genre_facet |
Greenland ice core Ice Sheet Journal of Glaciology NGRIP |
op_source |
Journal of Glaciology, Vol 68, Pp 799-811 (2022) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143021001374/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2021.137 0022-1430 1727-5652 https://doaj.org/article/3c7f436ec5da43ccb41fea72d2e50157 |
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_ |
1766017762240495616 |